DQR ID | Subject | Data Streams Affected |
---|---|---|
D000319.2 | SGP/SONDE - Data missing from sounding | sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D940812.1 | Sounding Data Suspect | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D950512.1 | Reprocess: Sounding 950506:0230 done in research mode | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D950728.1 | Reprocess: Sounding 950721:2030 Winds in Normal (not Research) mode | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D950728.2 | Reprocess: Sounding 950723:0228 Winds in Normal (not Research) mode | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D950815.5 | SGP/SONDE/B4 - Reprocess: sonde RESEARCH mode altitudes biased low | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D950922.1 | Apparent Interference Signal in Sounding | sgpsondewrpnB6.a1 |
D960229.4 | SGP/SONDE/B6 - incorrect factory RH calib-radiosondes | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D960229.5 | SGP/SONDE/B4 - incorrect factory RH calib-radiosondes | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D960722.1 | bad pressure sensor | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D970331.1 | Reprocess: Incorrect surface wind speed units | sgpsondewrpnB6.a1 |
D970407.2 | Incorrect surface temperature | sgpsondewrpnB4.a1 |
D970409.3 | Reprocess: Jump in pressure value | sgpsondewrpnB6.a1 |
D970410.6 | Reprocess: Incorrect surface wind speed | sgpsondewrpnB4.a1 |
D970422.1 | Jump in pressure value | sgpsondewrpnB6.a1 |
D970424.3 | Jump in pressure value | sgpsondewrpnB4.a1 |
D970430.1 | Jump in pressure value | sgpsondewrpnB6.a1 |
D970623.1 | Jump in pressure value B4 sounding | sgpsondewrpnB4.a1 |
D970624.3 | Jump in pressure value B6 sounding | sgpsondewrpnB6.a1 |
D970624.4 | Jump in pressure value B6 | sgpsondewrpnB6.a1 |
D970714.1 | Last sample incorrect b6 sounding 970712:1130 | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D970714.2 | qc flags set incorrectly at 11:52:44 | sgpsondewrpnB6.a1 |
D970718.1 | Missing/Questionable data 970715:0530 sounding | sgpsondewrpnB6.a1 |
D970721.1 | Pressure jump after launch | sgpsondewrpnB6.a1 |
D970921.1 | Pressure jump at launch | sgpsondewrpnB6.a1 |
D970921.2 | Pressure jump at launch | sgpsondewrpnB6.a1 |
D970921.3 | Pressure jump at launch | sgpsondewrpnB4.a1 |
D970930.2 | Pressure jump at launch | sgpsondewrpnB6.a1 |
D971002.1 | Pressure jump at launch | sgpsondewrpnB6.a1 |
D971006.2 | Pressure jump after launch | sgpsondewrpnB6.a1 |
D971007.1 | Weird surface value problem | sgpsondewrpnB4.a1 |
D971013.1 | Pressure jump at launch | sgpsondewrpnB6.a1 |
D971120.1 | B4 - Pressure jump at launch | sgpsondewrpnB4.a1 |
D980126.1 | Incorrect radiosonde serial numbers | sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
D980126.12 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980126.13 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980126.14 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980126.15 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980126.16 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980126.17 | Pressure jump at launch | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D980128.3 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980128.4 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980128.5 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980202.1 | Interference affects sounding | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D980202.2 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980202.3 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980202.4 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980202.5 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980202.6 | Pressure jump at launch. | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980202.7 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980203.1 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980203.2 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980204.1 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980206.1 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980209.1 | Pressure jump at launch | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980209.2 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980210.1 | Pressure jump at launch | sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D980210.2 | Pressure jump at launch | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980210.3 | Pressure jump at launch | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D980210.4 | Pressure jump at launch | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D990124.2 | SGP/SONDE - Dry bias in sonde RH | DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0, DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0, DsgpsondeC1.a1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1, DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1, DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondeptuB1.00, DsgpsondeptuB4.00, DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, DsgpsondeptucalcB1.c1, DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, sgpsondeB1.00, sgpsondeB1.a0, sgpsondeB1.a1, sgpsondeB4.00, sgpsondeB4.a0, sgpsondeB4.a1, sgpsondeB5.00, sgpsondeB5.a0, sgpsondeB5.a1, sgpsondeB6.00, sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondeptuC1.00, sgpsondewnpnB1.a0, sgpsondewnpnB1.a1, sgpsondewnpnB4.a0, sgpsondewnpnB4.a1, sgpsondewnpnB5.a0, sgpsondewnpnB5.a1, sgpsondewnpnB6.a0, sgpsondewnpnB6.a1, sgpsondewnpnC1.a0, sgpsondewnpnC1.a1, sgpsondewnprC1.a0, sgpsondewnprC1.a1, sgpsondewrpnB1.00, sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.00, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewrprB1.00, sgpsondewrprB1.a0, sgpsondewrprB1.a1, sgpsondewrprB4.00, sgpsondewrprB4.a0, sgpsondewrprB4.a1, sgpsondewrprB5.00, sgpsondewrprB5.a0, sgpsondewrprB5.a1, sgpsondewrprC1.00, sgpsondewrprC1.a0, sgpsondewrprC1.a1 |
D990126.1 | SGP/SONDE - Operator used wrong calibration tape | sgpsondewndcalcB4.c1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D990126.2 | SGP/SONDE - Incorrect surface pressure | sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
D990127.1 | SGP/SONDE - Operator used wrong calibration tape | sgpsondewndcalcB4.c1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
D990719.1 | SGP/SONDE Pressure jump at launch | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00 |
D990720.1 | SGP/SONDE Pressure jump at launch | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/16/2000 | 2043 | 03/16/2000 | 2144 |
Subject: | SGP/SONDE - Data missing from sounding |
DataStreams: | sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | It appears that the SDS interupted collection of the data from this sounding. There is a large gap and the message 13 0 4.0 4116 610.8 -8.1 78 -11.3 277 8.6 010010100101 #Collection process shut down by SIGTERM 74 38 4.6 19907 54.8 -62.6 1 -92.7 /// //// 011110100101 appears in the ingested data file. This is the same type of thing that happened at B1 at the same time. See DQR D000319.1 |
Measurements: | sgpsondewrpnB6.00:
sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/07/1994 | 0530 | 08/07/1994 | 0715 |
Subject: | Sounding Data Suspect |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: sgpsondeB4 Subject: Sounding data suspect Date Submitted: 8/12/94 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc):raw, a0, a1, et seq. What location was the data collected at: SGP/BF4 (Vici) Period of time in question Begin Date 8/ 7/94 Time 05:30 (GMT) End Date 8/ 7/94 Time 07:15 (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The temperature, RH, and (likely) pressure data for this sounding look incorrect. The temperature after launch is much too high, the RH drops almost immediately to near zero, and the reported height of the sounding is much greater than would be expected. Most likely cause is operator error (using the wrong calibration tape). Other observations/measurements impacted by this problem: Anything that uses sounding data. Even the winds are probably reported at the wrong altitudes (pressure problem). Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) There is no way to fix the data. The sounding should be deleted or flagged as bad. Data Processing Notes Date |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/06/1995 | 0230 | 05/06/1995 | 0415 |
Subject: | Reprocess: Sounding 950506:0230 done in research mode |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: Subject: B4 Sounding 950506:0230 Done in Research Mode Date Submitted: 5/12/95 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: SGPSONDEB4 What level data: (raw,a0,a1,b1,c1 etc): ALL What location was the data collected at: SGP/B4 (Vici) Period of time in question Begin Date 5/06/95 Time 02:30 (GMT) End Date 5/06/95 Time 04:15 (GMT) Data should be labeled: ___ questionable _X_ All data fields affected ___ incorrect ___ Only some data fields affected ___ wrong calibration _X_ others Discussion of Problem: This sounding was done in RESEARCH mode for both thermodynamic as well as wind data. The normal mode is to for RESEARCH winds only. As a result, both the ascending and descending flights of the sonde are included in the data file and none of the data are smoothed or filtered. Other observations/measurements impacted by this problem: I think that some of the radiation codes that use the sonde data as input don't handle the descending samples well. I'm not sure which ones may be affected. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Users should be notified and, if (and only if) requested, the sounding could be reprocessed either using the software developed at the EC or the digi-CORA. Data Processing Notes Date |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/21/1995 | 2030 | 07/21/1995 | 2030 |
Subject: | Reprocess: Sounding 950721:2030 Winds in Normal (not Research) mode |
DataStreams: | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: Subject: B6 Sounding 950721:2030 Winds in Normal (not Research) Mode Date Submitted: 7/28/95 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: SGPSONDEB6 What level data: (raw,a0,a1,b1,c1 etc): ALL What location was the data collected at: SGP/B6 (Purcell) Period of time in question Begin Date 7/21/95 Time 20:30 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected ___ incorrect ___ Only some data fields affected ___ wrong calibration _X_ others Discussion of Problem: This sounding was done in NORMAL (as opposed to RESEARCH mode for winds as well as for the thermodynamic variables. The "normal" mode is to use RESEARCH processing for the winds. The wind data included in this data file will have been subjected to the Vaisala processing algorithms and will appear somewhat smoother than our typical sounding. Other observations/measurements impacted by this problem: The horizontal convergence and tendency algorithms we use include their own wind smoothing algorithms. These may be affected by using this data set. I'm not sure which specific ones are involved, we should check with Marty Leach and/or John Yio. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Users should be notified and, if (and only if) requested, the sounding could be reprocessed either using the software developed at the EC or the digi-CORA. Data Processing Notes Date |
Measurements: | sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/23/1995 | 0228 | 07/23/1995 | 0228 |
Subject: | Reprocess: Sounding 950723:0228 Winds in Normal (not Research) mode |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: Subject: B6 Sounding 950723:0228 Winds in Normal (not Research) Mode Date Submitted: 7/28/95 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: SGPSONDEB6 What level data: (raw,a0,a1,b1,c1 etc): ALL What location was the data collected at: SGP/B6 (Purcell) Period of time in question Begin Date 7/23/95 Time 02:28 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected ___ incorrect ___ Only some data fields affected ___ wrong calibration _X_ others Discussion of Problem: This sounding was done in NORMAL (as opposed to RESEARCH mode for winds as well as for the thermodynamic variables. The "normal" mode is to use RESEARCH processing for the winds. The wind data included in this data file will have been subjected to the Vaisala processing algorithms and will appear somewhat smoother than our typical sounding. Other observations/measurements impacted by this problem: The horizontal convergence and tendency algorithms we use include their own wind smoothing algorithms. These may be affected by using this data set. I'm not sure which specific ones are involved, we should check with Marty Leach and/or John Yio. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Users should be notified and, if (and only if) requested, the sounding could be reprocessed either using the software developed at the EC or the digi-CORA. Data Processing Notes Date |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/19/1994 | 1728 | 05/21/1994 | 2359 |
Subject: | SGP/SONDE/B4 - Reprocess: sonde RESEARCH mode altitudes biased low |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | DQR DESCRIPTION: DQR No: Platform: BBSS Subject: Sonde RESEARCH mode altitudes biased low Date Submitted: 8/15/95 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc): All What location was the data collected at: CF, all BFs Period of time in question Begin Date 4/ 7/94 Time : (GMT) End Date / / Time : (GMT) Data should be labeled: ___ questionable ___ All data fields affected _X_ incorrect _X_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: I have discovered a problem with the RESEARCH mode (for PTU) Vaisala processing that results in a negative bias in the calculation of sonde altitude. This bias results from neglecting the sensed relative humidity when calculating air density when integrating the hydrostatic equation. In essence, the Vaisala RESEARCH mode (PTU) processing assumes a dry atmosphere when calculating sonde altitude. The magnitude of the bias is cumulative with height and will depend on the vertical distribution of moisture, but I have found that it can be as much as 20 meters at the tropopause (the RESEARCH-mode sounding altitudes will be smaller than altitudes calculated by using sensed RH). This problem applies to all soundings done in "WXPR" mode, where X is either R or N. In particular, all soundings done during the April 1994 (RCS) IOP (4/7/94 to 5/21/94) are affected as well as those occasional inadvertent WXPR soundings. Note that the only variable affected is "alt." In response to my queries, Vaisala explained that the dry-air calculation was selected to increase the processing speed in RESEARCH mode. They consider the problem to be a minor one. Vaisala claims that altitudes in NORMAL (or NOMINAL) processing are calculated by including the sensed RH. My simulation experiments have not yet progressed to the point where I can confirm this independently. Other observations/measurements impacted by this problem: Unknown. Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Users of the data should be informed of the problem. I have developed software that will reproduce the standard output stream with correct altitudes from the raw binary data and can provide it to interested users. Boundary facility soundings can also be reprocessed through the digi-CORA systems if need be. Data Processing Notes Date |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/28/1995 | 1138 | 07/28/1995 | 1140 |
Subject: | Apparent Interference Signal in Sounding |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sondeB6 Subject: Apparent Interference Signal in Sounding Date Submitted: October 22, 1995 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc): All What location was the data collected at: BF6- Purcell Period of time in question Begin Date 7/28/95 Time 11:38:00 (GMT) End Date 7/28/95 Time 11:40:16 (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: This sounding (which terminated after only nine minutes and sixteen seconds of flight) was apparently affected by the signal of another radiosonde. A sudden step-change in temperature occurs at seven minutes into the flight. This could be accounted for by the ground station locking onto another sonde and essentially reporting the foreign sonde's data with our sonde's calibration coefficients. The effect is most dramatic in temperture, however, rh and pressure should be similarly affected. The data below the level of the step-change are probably okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag Data Processing Notes Date |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/22/1995 | 1730 | 10/19/1995 | 1730 |
Subject: | SGP/SONDE/B6 - incorrect factory RH calib-radiosondes |
DataStreams: | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | Ongoing investigation of differences between preciptiable water vapor measured by the microwave radiometer and precipitable water vapor estimated by integrating the radiosonde-measured profile of water vapor density, along with isolated periods of anomalous behavior in the AERI/LBLRTM QME results led to the suggestion that the calibration of some radiosondes may be suspect. One group of radiosondes, calibrated in November 1994, seemed particularly irregular. I met with the manufacturer on February 7 to show them my results and discuss this issue with them. The manufacturer agreed that the data were suggestive of a calibration problem and offered to review their calibration records for the period in question. The initial results of the manufacture's investigation were sent to me on February 27. The manufacturer found that radiosondes assembled between 10/26/94 and 11/22/94 were incorrectly calibrated. The incorrect calibration affected only the relative humidity measurement; the nature of the calibration error is non-linear, with the radiosondes meeting the specified +/- 2% RH accuracy at both 20%RH (+45 degC) and 0%RH (room temperature). The error in calibration occurs at high RH and low temperature (approximate saturation at -30 degC) and can be as large as 10%RH with the radiosonde reading high. The direction of this error agrees with the observation of negative integrated residuals in the AERI ch 1 region made by Tony Clough and the tendency toward greater than 'normal' differences in PWV when compared to the MWR when these sondes were used. The cause of the calibration error was the addition of new, high RH, quality control check (-30 degC) into the manufacturing stream that required a change in the calibration software. The new software mistakenly loaded an incorrect parameter file that caused the calibration to be off at high RH - this was not noticed at the time because the radiosondes passed the regular production QC checks and the failure to agree at the new QC value was thought to result from a problem with the new reference standard. Troubleshooting the entire calibration system in an effort to incorporate the new QC check was conducted along with normal production, and took about a month to complete. The troubleshooting including adjustment of the calibration software, at which time the correct parameter file happened to be reloaded, and after which the radiosondes met the desired specification at the high RH value. According to the manufacturer, approximately 1900 radiosondes were calibrated during the period in question. Sondes from this period were used at all CART facilities. At least 1178 soundings involving these sondes were included in the QME results I looked at (some QME results were discarded because of problems with either the MWR data or the sounding data). The distribution of these 1178 by facility is: Facility Number of Sondes First Used Last Used (based on QME) CF 316 1/20/95 (11:30) 9/22/95 (11:30) B1 143 2/21/95 (17:30) 9/29/95 ( 8:30) B4 313 4/ 6/95 (17:30) 11/ 7/95 (17:28) B5 153 4/14/95 (17:30) 12/14/95 (17:30) B6 253 3/22/95 (17:30) 10/19/95 (17:30) The sondes can be recognized by decoding the serial_number metadata word in the sounding netCDF file. The serial number of the sondes in question is a number (8 or 9 digit) of the form DDMMYTTPP where DD is the day of the month (leading zero missing in the netCDF data), MM is the month +80 (e.g. 91 for November), Y is the last digit of the year (4 for 1994), TT is the calibration tray ID, and PP is the position of the sonde in the calibration tray. The sondes in question will therefore have serial numbers coded between 26904TTPP and 22914TTPP. |
Measurements: | sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/06/1995 | 1730 | 11/07/1995 | 1728 |
Subject: | SGP/SONDE/B4 - incorrect factory RH calib-radiosondes |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | Ongoing investigation of differences between preciptiable water vapor measured by the microwave radiometer and precipitable water vapor estimated by integrating the radiosonde-measured profile of water vapor density, along with isolated periods of anomalous behavior in the AERI/LBLRTM QME results led to the suggestion that the calibration of some radiosondes may be suspect. One group of radiosondes, calibrated in November 1994, seemed particularly irregular. I met with the manufacturer on February 7 to show them my results and discuss this issue with them. The manufacturer agreed that the data were suggestive of a calibration problem and offered to review their calibration records for the period in question. The initial results of the manufacture's investigation were sent to me on February 27. The manufacturer found that radiosondes assembled between 10/26/94 and 11/22/94 were incorrectly calibrated. The incorrect calibration affected only the relative humidity measurement; the nature of the calibration error is non-linear, with the radiosondes meeting the specified +/- 2% RH accuracy at both 20%RH (+45 degC) and 0%RH (room temperature). The error in calibration occurs at high RH and low temperature (approximate saturation at -30 degC) and can be as large as 10%RH with the radiosonde reading high. The direction of this error agrees with the observation of negative integrated residuals in the AERI ch 1 region made by Tony Clough and the tendency toward greater than 'normal' differences in PWV when compared to the MWR when these sondes were used. The cause of the calibration error was the addition of new, high RH, quality control check (-30 degC) into the manufacturing stream that required a change in the calibration software. The new software mistakenly loaded an incorrect parameter file that caused the calibration to be off at high RH - this was not noticed at the time because the radiosondes passed the regular production QC checks and the failure to agree at the new QC value was thought to result from a problem with the new reference standard. Troubleshooting the entire calibration system in an effort to incorporate the new QC check was conducted along with normal production, and took about a month to complete. The troubleshooting including adjustment of the calibration software, at which time the correct parameter file happened to be reloaded, and after which the radiosondes met the desired specification at the high RH value. According to the manufacturer, approximately 1900 radiosondes were calibrated during the period in question. Sondes from this period were used at all CART facilities. At least 1178 soundings involving these sondes were included in the QME results I looked at (some QME results were discarded because of problems with either the MWR data or the sounding data). The distribution of these 1178 by facility is: Facility Number of Sondes First Used Last Used (based on QME) CF 316 1/20/95 (11:30) 9/22/95 (11:30) B1 143 2/21/95 (17:30) 9/29/95 ( 8:30) B4 313 4/ 6/95 (17:30) 11/ 7/95 (17:28) B5 153 4/14/95 (17:30) 12/14/95 (17:30) B6 253 3/22/95 (17:30) 10/19/95 (17:30) The sondes can be recognized by decoding the serial_number metadata word in the sounding netCDF file. The serial number of the sondes in question is a number (8 or 9 digit) of the form DDMMYTTPP where DD is the day of the month (leading zero missing in the netCDF data), MM is the month +80 (e.g. 91 for November), Y is the last digit of the year (4 for 1994), TT is the calibration tray ID, and PP is the position of the sonde in the calibration tray. The sondes in question will therefore have serial numbers coded between 26904TTPP and 22914TTPP. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/19/1996 | 0537 | 07/19/1996 | 0725 |
Subject: | bad pressure sensor |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: sgpsondeB4 Subject: Bad pressure sensor 07/19/96 05:37 Date Submitted: 7/22/96 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnB4/all What level data: (raw,a0,a1,b1,c1 etc): What location was the data collected at: B4 (Vici) Period of time in question Begin Date 07/19/96 Time 05:37 (GMT) End Date 07/19/96 Time 07:25 (GMT) Data should be labeled: ___ questionable ___ All data fields affected _X_ incorrect _X_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: It appears that the pressure sensor on this sonde 'jumped' immediately after launch from the surface value of 941.8 hPa to 914.0 hPa. This could result from mechanical shock during launch. In any event, the pressure values throughout the sounding are incorrect, as will be the altitude, and ascent rate values. Other observations/measurements impacted by this problem: None Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/17/1997 | 1730 | 03/24/1997 | 1730 |
Subject: | Reprocess: Incorrect surface wind speed units |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Incorrect surface wind speed units (3/17/97-3/24/97) Date Submitted: 3/31/97 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other - Site Ops For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnB6 - all What level data: (raw,a0,a1,b1,c1 etc): What location was the data collected at: B6 (Purcell BF) Period of time in question Begin Date 03/17/97 Time 17:30 (GMT) End Date 03/24/97 Time 17:30 (GMT) Data should be labeled: ___ questionable ___ All data fields affected _X_ incorrect _X_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The BF operator noticed that the weather measure set used to provide the surface values for the soundings was incorrectly set to output wind speed in knots rather than m/s from 3/17 to (and including) 3/24. As a result, the value of the surface wind speed in the subject soundings is approximately twice the correct value (conversion of knots to meters/sec). Because the surface wind speed is not used in any subsequent calculation by the system, this should be a very low impact problem. Other observations/measurements impacted by this problem: None Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/03/1997 | 2332 | 04/03/1997 | 2332 |
Subject: | Incorrect surface temperature |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: sgpsondeB4 Subject: Incorrect surface pressure: sounding B4 04/03/97:2332 Date Submitted: 4/07/97 Submitted By: _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other - Site Ops For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnB4/all What level data: (raw,a0,a1,b1,c1 etc): What location was the data collected at: B4 Period of time in question Begin Date 04/03/97 Time 23:32 (GMT) End Date Time (GMT) Data should be labeled: ____ questionable ___ All data fields affected _X__ incorrect _X_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: It appears that the site operator made a keyboard mistake when entering the surface temperature for the subject sounding. The temperature was entered as 26.0 degC and the first temperature value reported by the radiosonde was 14.3 degC. The operators' meteorological observation log shows that the surface temperature was 14.2 degC at 2300. Other observations/measurements impacted by this problem: None Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/04/1997 | 1733 | 04/04/1997 | 1733 |
Subject: | Reprocess: Jump in pressure value |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Jump in pressure value B6 sounding 970404.1733 Date Submitted: 4/9/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb6/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF6 Period of time in question Begin Date 4/04/97 Time 17:33 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The first pressure value reported by the radiosonde (t = 2 sec) is 879.2. The surface pressure value was 962.1 hPa. Either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding will be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. Data Processing Notes Date |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/03/1997 | 2030 | 04/03/1997 | 2030 |
Subject: | Reprocess: Incorrect surface wind speed |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: sgpsondeB4 Subject: Incorrect surface wind speed B4 970403:2030 Date Submitted: 4/10/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb4 What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF4 Period of time in question Begin Date 4/03/97 Time 20:30 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The surface wind speed was entered by the operator as 103 m/s. This is clearly a typo and was flagged by the automatic QC check. The surface speed at 2000 was 0.9 and at 2100 was 0.0. It is likely the operator intended to enter either 1.3 or 0.3 m/s. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/18/1997 | 1731 | 04/18/1997 | 1731 |
Subject: | Jump in pressure value |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Jump in pressure value B6 sounding 970418.1731 Date Submitted: 4/22/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb6/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF6 Period of time in question Begin Date 4/18/97 Time 17:31 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The first pressure value reported by the radiosonde (t = 2 sec) is 913.4. The surface pressure value was 973.9 hPa. This difference is substantially greater than the expected (normal) change and may mean that either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding will be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/20/1997 | 2030 | 04/20/1997 | 2030 |
Subject: | Jump in pressure value |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: sgpsondeB4 Subject: Jump in pressure value B4 sounding 970420.2030 Date Submitted: 4/24/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb4/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF4 Period of time in question Begin Date 4/20/97 Time 20:30 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The first pressure value reported by the radiosonde (t = 2 sec) is 925.7. The surface pressure value was 933.7 hPa. This difference is somewhat greater than the expected (normal) change and may mean that either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding will be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/12/1997 | 0832 | 04/12/1997 | 0832 |
Subject: | Jump in pressure value |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Jump in pressure value B6 sounding 970412.0832 Date Submitted: 4/30/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb6/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF6 Period of time in question Begin Date 4/12/97 Time 08:32 (GMT) End Date Time (GMT) Data should be labeled: ___ questionable _X_ All data fields affected _X_ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: This is a sounding that was just reprocessed because the original data was not sent to the SDS due to a communication problem. The first pressure value reported by the radiosonde (t = 2 sec) is 904.3. The surface pressure value was 978.9 hPa. This difference is substantially greater than the expected (normal) change and may mean that either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding will be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/16/1997 | 1730 | 06/16/1997 | 1730 |
Subject: | Jump in pressure value B4 sounding |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | DQR No: Platform: sgpsondeB4 Subject: Jump in pressure value B4 sounding 970616:1730 Date Submitted: 6/22/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb4/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF4 Period of time in question Begin Date 6/16/97 Time 17:30 (GMT) End Date Time (GMT) Data should be labeled: _X_ questionable _X_ All data fields affected ___ incorrect ___ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The first pressure value reported by the radiosonde (t = 2 sec) is 931.4. The surface pressure value was 936.9 hPa. This difference is slightly greater than the expected (normal) change and may mean that either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding may be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/19/1997 | 0530 | 06/19/1997 | 0530 |
Subject: | Jump in pressure value B6 sounding |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Jump in pressure value B6 sounding 970619:0530 Date Submitted: 6/24/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb6/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF6 Period of time in question Begin Date 6/19/97 Time 05:30 (GMT) End Date Time (GMT) Data should be labeled: _X_ questionable ___ All data fields affected ___ incorrect _X_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The first pressure value reported by the radiosonde (t = 2 sec) is 970.4. The surface pressure value was 975.1 hPa. This difference is greater than the expected (normal) change and may mean that either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding may be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/19/1997 | 1130 | 06/19/1997 | 1130 |
Subject: | Jump in pressure value B6 |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Jump in pressure value B6 sounding 970619:1130 Date Submitted: 6/24/97 Submitted By: Barry Lesht _X_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: sgpsondewrpnb6/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF6 Period of time in question Begin Date 6/19/97 Time 11:30 (GMT) End Date Time (GMT) Data should be labeled: _X_ questionable ___ All data fields affected ___ incorrect _X_ Only some data fields affected ___ wrong calibration ___ others Discussion of Problem: The first pressure value reported by the radiosonde (t = 2 sec) is 968.0. The surface pressure value was 974.5 hPa. This difference is greater than the expected (normal) change and may mean that either the pressure sensor was jarred during launch or the system mis-identified the actual launch start time. Further clarification requires analysis of the raw data which will take some time. The altitude values for this sounding may be incorrect. The ascent rate values during the first 30 seconds also will be wrong. Because the system will reject samples with out of bound ascent rates (i.e., during the first 30 seconds), the temperature and rh values also will be incorrect (result of interpolation). Relative height values after 30 seconds should be okay. Other observations/measurements impacted by this problem: Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Flag data. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/12/1997 | 1314 | 07/12/1997 | 1314 |
Subject: | Last sample incorrect b6 sounding 970712:1130 |
DataStreams: | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | It appears that a communications glitch resulted in the last sample line of the raw data provided by the instrument being corrupted. As a result, the ingest translated the corrupted data as real information. The last valid sample is the one collected at 104 min 48 seconds into the sounding. Because this was the last sample in the file, I do not recommend that we reprocess these data. |
Measurements: | sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/12/1997 | 1152 | 07/12/1997 | 1152 |
Subject: | qc flags set incorrectly at 11:52:44 |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | This should be an 'inverse' data quality report. Because of the problem with the ingest of this file caused by the communication glitch (see earlier DQR and PIF submitted today) the qc_delta flags for variabels tdry and asc were set incorrectly. All data for this sounding from 11:30 to one sample from the end are correct and the only qc flags that should be set are at the first and last samples of the file. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/15/1997 | 0604 | 07/15/1997 | 0705 |
Subject: | Missing/Questionable data 970715:0530 sounding |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DATA QUALITY REPORT(DQR) DQR No: D970718.1 o Date Submitted: Fri Jul 18 16:29:46 GMT 1997 o Submitted By: Barry Lesht Organization: ANL Telephone: (630) 252-4208 Email: bmlesht@anl.gov o Subject of DQR: sgpsondewrpnB6.9707150604.9707150705.all - Missing/Questionable data 970715:0530 sounding o Data should be labeled: questionable, missing o Description: This file has two problems. The first is possible interference and incorrect data from 34:32 into the flight (06:04:32 or 9673 m) to 38:48 (06:08:48 or 10718 m). I would treat these data a questionable. There is a gap in the data, possibly due to SDS communication problems from 38:48 to 95:42 (07:05:42 or 25112 m) in which all data are missing. o Suggested Corrections: Reprocess file from raw data (companion PIF will be submitted). Flag data. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/17/1997 | 2340 | 07/17/1997 | 2340 |
Subject: | Pressure jump after launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | First pressure value returned by the sonde after launch was 966.8, somewhat lower than would be expected given the surface pressure reading of 971.3. This resulted in an apparent ascent rate that is greater than the QC flag trigger. Ascent rates during the first 30 s of flight are likely incorrect. Absolute altitudes also are likely incorrect. Relative pressure differences after launch should be okay. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/1997 | 1728 | 09/16/1997 | 1728 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | The first pressure value reported by the sonde after launch (966.1) is lower than the surface pressure value (972.1) by a greater difference than normally would be expected. This may indicate that the sonde was jarred on launch, that the system mis-identified actual launch time, or that the operator entered and incorrect value (typo or read too early). The altitude values for this sounding will be wrong as will the ascent rates during the first 30 seconds. If the ascent rates were such that the sample acceptance criteria were violated, the pressure, temperature, and RH values in the first part of the profile may be the result of interpolation. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/17/1997 | 0530 | 09/17/1997 | 0530 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value reported by the sonde (958.8) and the surface pressure (969.3) is considerable greater than would be expected. The altitude values for this sounding will be incorrect, as will be the ascent rate values during the first 30 seconds. Values of P, T, and RH during the first 30 seconds will most likely be values interpolated betwen the surface and the 30 second sample. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/17/1997 | 2030 | 09/17/1997 | 2030 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure reported by the sonde after launch (930.0) and that reported at the surface (935.7) is larger than would be expected. The altitude values for this sounding will be incorrect, as will be the ascent rates for the first 30 seconds. Some of the P, T, and RH samples (most likely those nearest the ground) will be interpolated values. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/27/1997 | 2030 | 09/27/1997 | 2030 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value reported by the radiosonde aloft (957.9) and the surface value entered by the operator (962.6) is greater than would be expected normally. This may indicate that the sonde was jarred at launch or that the system mis-identified the launch start time. The altitude values for this sounding will be incorrect as will be the ascent rates in the first 30 seconds. If the reported ascent rates exceed 12 m/s, the thermodynamic data will be interpolated rather than sampled. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/1997 | 2030 | 09/29/1997 | 2030 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (968.5) and the surface value entered by the opertor (973.5) is greater than would normally be expected. This may indicate that either the sonde was jarred at launch or that the system mis-identified launch start time. The altitude values for this sounding will be in error and the ascent rate values in the first 30 seconds also will be wrong. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/1997 | 2030 | 09/29/1997 | 2030 |
Subject: | Pressure jump after launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (968.5) and the surface value entered by the operator (973.8) is greater than would normally be expected. The altitude values for this sounding will be incorrect as will be the ascent rates for the first 30 seconds. Some of the thermodynamic data at the beginning of the soundings (when ascent rates exceed 12 m/s) will be the result of interpolation between the surface value and the first value obtained when the ascent rate with in acceptable limits. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/04/1997 | 1430 | 10/04/1997 | 1430 |
Subject: | Weird surface value problem |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | For some unknown reason, the surface values of pressure, temperature, and rh in this file are corrupted. The correct values are in the raw data file, which looks normal. The correct values are 938.2 hPa, 22.1 degC, and 50% RH instead of 20001 hPa, 501.0 degC and 11501 RH. Because the raw data looks fine, all the other values in this file should be correct. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/06/1997 | 0854 | 10/06/1997 | 0854 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value obtained from the sonde after launch (971.1) and the value of surface pressure entered by the operator (976.8) is larger than usual. I note that soundings done at 0530 and 1130 have surface pressures of 973.2. It may be a typographic error by the operator, jarring of the sensor at launch, or mis-identification of the start time by the system. In any event, the absolute altitudes for this sounding will be wrong, and the ascent rates during the first 30 seconds also will be too high. |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/19/1997 | 1735 | 11/19/1997 | 1735 |
Subject: | B4 - Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value recorded by the sonde after launch (936.6) and the value for surface pressure recorded by the operator (944.9) is greater than normally expected. This may be due to physical jarring of the sonde at launch, to misidentification of the launch time by the system, or some other cause. The altitude values for this sounding will be incorrect as will be the ascent rate values during the first 30 seconds of the flight. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/1998 | 0000 | 12/31/1999 | 2359 |
Subject: | Incorrect radiosonde serial numbers |
DataStreams: | sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
Description: | Radiosondes manufactured at Vaisala's Woburn, MA factory during the first of January 1998 have incorrect serial numbers. Instead of being numbered 8012XXXXX these sondes are numbered 7012XXXXX. Vaisala has been informed of this, has confirmed the problem, and has corrected their numbering for all subsequent sondes. 163 incorrectly numbered sondes were shipped to ARM on 1/9/98. Some have been used at the CF since 1/19/98:1430. |
Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnB5.a1:
sgpsondewrpnB4.a0:
sgpsondewrpnB1.a0:
sgpsondewrpnB6.a0:
sgpsondewrpnB5.a0:
sgpsondewrpnB4.a1:
sgpsondewrpnB6.a1:
sgpsondewrpnC1.a1:
sgpsondewrpnB1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/21/1998 | 2029 | 01/21/1998 | 2029 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The first pressure value reported by the sonde after launch (939.1) is much lower than that reported at the surface (946.1). This may result from jarring at launch, failure of the system to detect launch, or other problem. The absolute altitude for this sounding and ascent rates for the first 30 seconds will be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/22/1998 | 1430 | 01/22/1998 | 1430 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The first pressure value reported by the sonde (941.7) is much smaller than the surface value (949.9) indicating that the sonde was either jarred on launch, or that the system failed to properly identify the start time. The absolute altitude for the sounding and ascent rates for the first 30 seconds will be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/22/1998 | 1729 | 01/22/1998 | 1729 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The first pressure value reported by the sonde after launch (941.2) is much smaller than that reported at the surface (949.3). This suggests that the sonde was jarred on launch or that the system failed to detect start properly. The absolute alititude throughout the sounding and the ascent rates during the first 30 seconds will be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/24/1998 | 0229 | 01/24/1998 | 0229 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The first pressure value reported by the sonde after launch (943.3) is much lower than the surface pressure (950.1). Either the sonde was jarred at launch or the system failed to identify the start time correctly. The absolute altitudes for the sounding and the ascent rates for the first 30 seconds will be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/24/1998 | 0529 | 01/24/1998 | 0529 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The first pressure value reported by the sonde after launch (949.9) is somewhat lower than the surface pressure (942.8). This may indicate that the sonde was jarred at launch or that the system failed to identify the start time. The absolute altitude for the sounding and ascent rate for the first 30 seconds will be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/20/1998 | 0830 | 01/20/1998 | 0830 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (964.0) and the surface pressure (971.8) is greater than would be expected. The sonde may have been jarred at launch or the system may not have identified the start time correctly. The absolute altitude for the sounding and ascent rates for the first 30 s will be incorrect. |
Measurements: | sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/26/1998 | 0830 | 01/26/1998 | 0830 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (940.3) and the surface value entered by the operator (945.8) is somewhat larger than expected. This may indicate that the sonde was jarred on launch or that the system did not identify the start time properly. The absolute altitude for this sounding will be in error as will be the ascent rates during the first 30 s. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/26/1998 | 1130 | 01/26/1998 | 1130 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (942.1) and the surface pressure (947.1) is somewhat greater than expected. This may indicate that the sonde was jarred during launch or that the system failed to identify the start time properly. The absolute altitude during this sounding will be questionable as will be the ascent rate during the first 30 s. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/26/1998 | 1429 | 01/26/1998 | 1429 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (942.8) and the surface pressure (949.2) is greater than expected. This may indicate that the sonde was jarred at launch or that the system failed to identify the start time properly. The absolute altitudes for this sounding will be questionable as will be the ascent rate during the first 30 s. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/29/1998 | 1736 | 01/29/1998 | 1740 |
Subject: | Interference affects sounding |
DataStreams: | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | It appears that the ground station either locked on an incorrect signal (probably from another radiosonde) or was incorrectly tuned to the sonde being launched. As a result, all of the data from this sounding look strange. The sounding is itself short (only 228 sec duration) again indicating a telemetry problem. |
Measurements: | sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/29/1998 | 1430 | 01/29/1998 | 1430 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (949.7) and the reported surface pressure (943.7) is somewhat larger than expected. As a result, the absolute altitudes for this sounding and the ascent rates for the first 30 seconds are questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/29/1998 | 1729 | 01/29/1998 | 1729 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (944.9) and that reported for the surface (949.8) is somewhat larger than would be expected. The absolute altitude for this sounding and the ascent rate during the first 30 seconds will be questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/29/1998 | 2029 | 01/29/1998 | 2029 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (941.4) and the surface value (946.7) is somewhat greater than would be expected. The absolute altitude for this sounding and the ascent rate during the first 30 seconds will be questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/30/1998 | 1430 | 01/30/1998 | 1430 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (944.9) and the surface pressure (949.8) is larger than expected. The absolute altitude for the entire sounding and the ascent rate for the first 30 seconds will be questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/30/1998 | 1729 | 01/30/1998 | 1729 |
Subject: | Pressure jump at launch. |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (935.7) and the surface pressure (940.7) is somewhat larger than expected. The absolute altitude for the entire sounding and the ascent rate for the first 30 seconds will be questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/30/1998 | 2130 | 01/30/1998 | 2130 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (935.7) and the surface pressure (940.7) is larger than would be expected. The absolute altitude for this sounding and the ascent rate for the first 30 seconds will be questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/01/1998 | 2329 | 02/01/1998 | 2329 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (936.9) and the surface pressure (942.1) is greater than expected. The absolute altitude for this sounding and the ascent rate during the first 30 seconds will likely be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/02/1998 | 0230 | 02/02/1998 | 0230 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (938.7) and the surface pressure (943.6) is somewhat greater than expected. The absolute altitude for this sounding as well as the ascent rate during the first 30 seconds will likely be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/02/1998 | 1429 | 02/02/1998 | 1429 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (940.3) and the surface pressure (946.4) is greater than would be expected. The absolute altitudes for the sounding and the ascent rate for the first 30 seconds will likely be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/04/1998 | 1130 | 02/04/1998 | 1130 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (942.1) and the surface pressure (947.6) is greater than expected. The absolute altitude for this sounding and the ascent rate during the first 30 seconds will likely be incorrect. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/06/1998 | 2329 | 02/06/1998 | 2329 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (943.3) and the surface pressure (948.1) is greater than would be expected. The absolute altitude for this soundings and the ascent rate for the first 30 sec are questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.00:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/07/1998 | 0229 | 02/07/1998 | 0229 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (943.3) and the surface pressure (948.6) is greater than would be expected. The absolute altitude for this sounding and the ascent rate for the first 30 seconds will be questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/07/1998 | 1430 | 02/07/1998 | 1430 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (968.0) and the surface pressure is greater than is expected. The absolute altitude for this sounding and the ascent rate for the first 30 seconds are questionable. |
Measurements: | sgpsondewrpnB6.00:
sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/07/1998 | 1729 | 02/07/1998 | 1729 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported after launch (940.8) and the surface pressure (946.8) is greater than expected. The absolute altitude for this sounding and the ascent rate for the first 30 seconds are questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.00:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/08/1998 | 2330 | 02/08/1998 | 2330 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (937.1) and the surface pressure is greater than expected. The absolute altitude for this sounding and the ascent rate during the first 30 seconds are questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.00:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/09/1998 | 0529 | 02/09/1998 | 0529 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (935.9) and the surface pressure (941.7) is greater than expected. The absolute altitudes for this sounding and the ascent rates for the first 30 seconds are questionable. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/27/1992 | 0000 | 05/31/2002 | 2359 |
Subject: | SGP/SONDE - Dry bias in sonde RH |
DataStreams: | DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0, DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0, DsgpsondeC1.a1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1, DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1, DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondeptuB1.00, DsgpsondeptuB4.00, DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, DsgpsondeptucalcB1.c1, DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, sgpsondeB1.00, sgpsondeB1.a0, sgpsondeB1.a1, sgpsondeB4.00, sgpsondeB4.a0, sgpsondeB4.a1, sgpsondeB5.00, sgpsondeB5.a0, sgpsondeB5.a1, sgpsondeB6.00, sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondeptuC1.00, sgpsondewnpnB1.a0, sgpsondewnpnB1.a1, sgpsondewnpnB4.a0, sgpsondewnpnB4.a1, sgpsondewnpnB5.a0, sgpsondewnpnB5.a1, sgpsondewnpnB6.a0, sgpsondewnpnB6.a1, sgpsondewnpnC1.a0, sgpsondewnpnC1.a1, sgpsondewnprC1.a0, sgpsondewnprC1.a1, sgpsondewrpnB1.00, sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.00, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewrprB1.00, sgpsondewrprB1.a0, sgpsondewrprB1.a1, sgpsondewrprB4.00, sgpsondewrprB4.a0, sgpsondewrprB4.a1, sgpsondewrprB5.00, sgpsondewrprB5.a0, sgpsondewrprB5.a1, sgpsondewrprC1.00, sgpsondewrprC1.a0, sgpsondewrprC1.a1 |
Description: | Vaisala has confirmed ARM findings of an apparent dry bias in the relative humidity measured by RS-80H radiosondes. The cause of the dry bias is thought to be contamination of the humidity sensor by volatile organic substances originating from some plastic parts of the radiosonde. The amount of contamination is a function of the time between the date of sonde manufacture and its use. All RS-80H sondes manufactured before week 34 of 1998 will show this bias. After week 34 of 1998 Vaisala changed its packaging to reduce, but not eliminate the contamination problem. Starting with RS-80 radiosonde manufactured in late June 2000 Vaisala enclosed the sensor boom in an inert plastic shield, thereby eliminating the contamination that caused the dry bias. Starting in May 2001 at the SGP, May 2002 at the TWP, and later 2002 at the NSA, ARM has moved to using RS-90 radiosondes. These sondes are not subject to the contaminatino that caused the dry bias. Vaisala is in the process of developing an algorithm that can be used to estimate the correct RH from knowledge of the sonde age. All of the ARM sounding data have sufficient metadata available to apply the correction. Additionally, ARM has funded a Science Team effort (Milosevich) to develop a 'best' correction algorithm for the RS-80 radiosonde humidity data. When completed this algorithm will allow us to reprocess the accumulated RS-80 data and produce a new data platform with what we hope will be more accurate data. |
Measurements: | sgpsondeB4.00:
DsgpsondeB5.00:
sgpsondewrpnC1.00:
sgpsondewnpnC1.a1:
DsgpsondeptuB6.00:
DsgpsondenogcptucalcB1.c1:
sgpsondewrpnB6.a0:
DsgpsondeptuC1.00:
sgpsondewnprC1.a0:
DsgpsondenogcptucalcB5.c1:
DsgpsondeptucalcC1.c1:
sgpsondewnpnB4.a1:
sgpsondeB6.00:
sgpsondewrprB4.00:
DsgpsondeptuB1.00:
DsgpsondenogcptucalcC1.c1:
sgpsondewrpnC1.a1:
sgpsondewrpnB1.a1:
sgpsondewrprC1.00:
sgpsondewrpnB1.a0:
sgpsondewrprB5.a1:
sgpsondeB5.a1:
sgpsondewrprB5.00:
DsgpsondeC1.00:
sgpsondewrprB1.a1:
sgpsondeB1.00:
sgpsondeptuC1.00:
DsgpsondenogcptucalcB4.c1:
DsgpsondeB1.a0:
DsgpsondeC1.a1:
DsgpsondeptucalcB5.c1:
sgpsondewrprB1.00:
sgpsondewrpnC1.a0:
sgpsondewrpnB1.00:
sgpsondeB1.a0:
DsgpsondeC1.a0:
DsgpsondeB4.a1:
DsgpsondeptuB4.00:
sgpsondeB1.a1:
sgpsondewrprB5.a0:
sgpsondeC1.00:
sgpsondewnpnB1.a1:
sgpsondewrpnB6.a1:
sgpsondewrprC1.a0:
sgpsondeC1.a0:
sgpsondewrprC1.a1:
DsgpsondeptuB5.00:
sgpsondewrpnB5.a0:
sgpsondewrprB4.a1:
DsgpsondeB1.a1:
sgpsondeB5.a0:
sgpsondewnpnB6.a0:
DsgpsondeB5.a1:
DsgpsondenogcwrpnB1.c1:
sgpsondewrprB1.a0:
sgpsondewrpnB5.00:
DsgpsondeB4.a0:
DsgpsondenogcwrpnB4.c1:
DsgpsondeB5.a0:
sgpsondewnpnB4.a0:
sgpsondewnprC1.a1:
sgpsondewrpnB5.a1:
sgpsondewnpnB5.a0:
DsgpsondeB4.00:
sgpsondewrpnB6.00:
sgpsondewrprB4.a0:
sgpsondewnpnB1.a0:
sgpsondeB4.a1:
sgpsondeC1.a1:
sgpsondewrpnB4.00:
DsgpsondenogcwrpnB5.c1:
sgpsondewnpnC1.a0:
sgpsondewrpnB4.a0:
DsgpsondeB1.00:
sgpsondeB4.a0:
sgpsondewnpnB6.a1:
sgpsondewrpnB4.a1:
sgpsondewnpnB5.a1:
DsgpsondeptucalcB4.c1:
DsgpsondenogcwrpnC1.c1:
sgpsondeB5.00:
DsgpsondeptucalcB1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/25/1999 | 1436 | 01/25/1999 | 1636 |
Subject: | SGP/SONDE - Operator used wrong calibration tape |
DataStreams: | sgpsondewndcalcB4.c1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | The operator used the wrong calibration tape for this sounding. The temperature and dew point data are obviously incorrect, the other thermodynamic variables are incorrect as well. The calibration tape was for sonde serial number 819351413, the operator log shows sonde serial number 819351406. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewndcalcB4.c1:
sgpsondewrpnB4.00:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/25/1999 | 0230 | 01/25/1999 | 0230 |
Subject: | SGP/SONDE - Incorrect surface pressure |
DataStreams: | sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1 |
Description: | The operator entered the TWHAPS surface pressure 980.4 hPa instead of the sonde surface pressure 978.2. As a result, the absolute altitudes for this sounding will be incorrect as will be the ascent rates during the first 30 seconds. |
Measurements: | sgpsondewrpnB6.00:
sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/26/1999 | 0230 | 01/26/1999 | 0305 |
Subject: | SGP/SONDE - Operator used wrong calibration tape |
DataStreams: | sgpsondewndcalcB4.c1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | It appears that the operator loaded the wrong calibration tape with this sonde. All PTU data are incorrect. Apparently, the operator noticed a problem and started a new sounding at 0305 (different file). |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewndcalcB4.c1:
sgpsondewrpnB4.00:
sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/16/1999 | 2031 | 07/16/1999 | 2031 |
Subject: | SGP/SONDE Pressure jump at launch |
DataStreams: | sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00 |
Description: | Sonde pressure at launch recorded as 974.9 (THWAPS 975.1); first pressure after launch recorded as 969.7. This difference is slightly larger than would be expected. It may be that the pressure sensor was jarred during launch or the system failed to detect the correct time of launch. In either case, the absolute altitudes for this sounding will be incorrect as will be the ascent rates during the first 30 seconds of flight. |
Measurements: | sgpsondewrpnC1.00:
sgpsondewrpnB6.a0:
sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/19/1999 | 0530 | 07/19/1999 | 0530 |
Subject: | SGP/SONDE Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1 |
Description: | Sonde pressure before launch was 947.7, first sample after launch had pressure value of 940.8. THWAPS read 946.6. Either pressure sensor was jarred or the system failed to detect launch properly. Absolute altitudes for this sounding will be incorrect as will the ascent rate during the first 30 seconds of flight. |
Measurements: | sgpsondewrpnB4.a0:
sgpsondewrpnB4.00:
sgpsondewrpnB4.a1:
|