DQR ID | Subject | Data Streams Affected |
---|---|---|
D021229.1 | TWP/SONDE/C1 - Broken Temperature Sensor | twpsondewnpnC1.a1, twpsondewnpnC1.b1 |
D021231.2 | TWP/Sonde/C1 - Bad RH Values | twpsondewnpnC1.a1, twpsondewnpnC1.b1 |
D030227.3 | TWP/SMET/C1 - Reprocess: Miscalibrated windspeed2 data | twpsmet60sC1.a1, twpsmet60sC1.b1 |
D030312.9 | TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | twpmwrlosC1.b1 |
D040220.1 | TWP/MWR/C1 - wrong azimuth | twpmwrlosC1.b1 |
D050421.6 | TWP/SMET/C1 - Negative rainfall rates | twpsmet60sC1.b1 |
D050725.9 | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients | twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1 |
D050928.1 | TWP/MWR/C1 - New software version (4.15) installed | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D060817.3 | TWP/SMET/C1 - Reprocess: Barometric Data Changed from hPa to kPa | twpsmet60sC1.b1 |
D061011.2 | TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge added | twpsmet60sC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/18/2002 | 2334 | 09/19/2002 | 0111 |
09/21/2002 | 2330 | 09/22/2002 | 0059 |
10/01/2002 | 2349 | 10/02/2002 | 0117 |
10/13/2002 | 1139 | 10/13/2002 | 1303 |
10/18/2002 | 2358 | 10/19/2002 | 0113 |
05/23/2003 | 2330 | 05/24/2003 | 0135 |
06/14/2003 | 2330 | 06/15/2003 | 0147 |
06/22/2003 | 1159 | 06/22/2003 | 1332 |
06/22/2003 | 2349 | 06/23/2003 | 0110 |
06/23/2003 | 1146 | 06/23/2003 | 1323 |
06/25/2003 | 2342 | 06/26/2003 | 0118 |
06/28/2003 | 2330 | 06/29/2003 | 0056 |
06/29/2003 | 1134 | 06/29/2003 | 1312 |
Subject: | TWP/SONDE/C1 - Broken Temperature Sensor |
DataStreams: | twpsondewnpnC1.a1, twpsondewnpnC1.b1 |
Description: | The temperature sensor on these radiosondes broke after launch. All the temperature related data are incorrect. |
Measurements: | twpsondewnpnC1.b1:
twpsondewnpnC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/21/2002 | 2336 | 12/22/2002 | 0119 |
Subject: | TWP/Sonde/C1 - Bad RH Values |
DataStreams: | twpsondewnpnC1.a1, twpsondewnpnC1.b1 |
Description: | The RH values from the surface to approximately 11.5 km oscillate between reasonable values and zero. This is apparently caused by a failure in the RH sensor heating process. Although the oscillation stops when the heating stops (at temperatures below ~ -45degC) I think the values must be viewed as suspect. |
Measurements: | twpsondewnpnC1.b1:
twpsondewnpnC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/15/2002 | 0000 | 02/27/2003 | 1100 |
Subject: | TWP/SMET/C1 - Reprocess: Miscalibrated windspeed2 data |
DataStreams: | twpsmet60sC1.a1, twpsmet60sC1.b1 |
Description: | A replacement anemometer (WSP2) was installed but the new anemometer calibration coefficients were not put into the logger. The multiplication factor was 0.09708 when it should have been 0.09763 (very small difference)the offset was 0.36 when it should have been 0.3 (a difference 0.06 m/s). |
Measurements: | twpsmet60sC1.b1:
twpsmet60sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/04/2002 | 2200 | 10/31/2002 | 2220 |
Subject: | TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
DataStreams: | twpmwrlosC1.b1 |
Description: | Several related and recurring problems with the MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data, spikes in the data, negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program. Because these all initially appeared to be hardware-related problems, the instrument mentor and SGP site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which did not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 02/18/2004 | 2250 |
Subject: | TWP/MWR/C1 - wrong azimuth |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR was initially installed at an azimuth angle defined as 180 degrees but the value in the configuration file was not changed from the default of 0 degrees. In examining photos taken during the installation of the AWS tower, I noticed that the MWR was rotated opposite the normal orientation. The value in the configuration file was changed to reflect the actual azimuth of the instrument. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 0000 | 03/09/2004 | 2243 |
Subject: | TWP/SMET/C1 - Negative rainfall rates |
DataStreams: | twpsmet60sC1.b1 |
Description: | Due to limitations of the Zeno dataloggers all voltage measurements from the optical rain gauge (ORG) were converted to rainfall rates. This resulted in negative values for rain rates. Any value below 0.10 mm/hr should be considered to be 0 mm/hr. New dataloggers alleviated this problem. New loggers were installed 03/09/2004 @ 2243 GMT. |
Measurements: | twpsmet60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/04/2002 | 0200 | 06/30/2005 | 2100 |
Subject: | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients |
DataStreams: | twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). The Rosenkranz-based retrieval coefficients became active at TWP.C1 20020504.0200. The MONORTM-based retrieval coefficients became active at TWP.C1 20050630.2100. Note: The TWP.C1 data for 19961011-20050630 have been reprocessed to apply the |
Measurements: | twpmwrlosC1.b1:
twp5mwravgC1.c1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/31/2002 | 2200 | 09/13/2005 | 1854 |
Subject: | TWP/MWR/C1 - New software version (4.15) installed |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in October 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software version (4.15) was installed on 9/13/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 0000 | 07/13/2006 | 2225 |
Subject: | TWP/SMET/C1 - Reprocess: Barometric Data Changed from hPa to kPa |
DataStreams: | twpsmet60sC1.b1 |
Description: | Barometric pressure data was converted from hPa to kPa in order to standardize the measurement units among ARM sites and to conform to accepted standard units determined by the scientific community. |
Measurements: | twpsmet60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/1996 | 0000 | 10/17/2006 | 0000 |
Subject: | TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge added |
DataStreams: | twpsmet60sC1.b1 |
Description: | A tipping bucket rain gauge was added to the TWP.C1 SMET suite of instruments on 20061017. Effective 20060926, two new variables (count and rain amount) were added to the end of the twpsmet60sC1.b1 datastream. Between 9/26 and 10/17, the data for these two variables are filled with zeros. Users should not use the data during this period as the zeros are not representative of the rain fall at the site. When reprocessing of this datastream occurs these variables will be added for the 19961009-20060926 and data from 19961009-20061017 will be filled with -9999 (missing). |
Measurements: | twpsmet60sC1.b1:
|