| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000127.1 | TWP/MWR/C2 - Uncertainty in clock time | twpmwrlosC2.b1, twpmwrtipC2.a1 |
| D990107.1 | TWP/MWR/C2 - Software Change | twpmwrlosC2.b1 |
| D990916.1 | SGP/MWR/B1/B4/B5/B6 - data file split at 23:59 | sgpmwrlosB1.a1, sgpmwrlosB1.b1, sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgpmwrtipB1.a1, sgpmwrtipB4.a1, sgpmwrtipB5.a1, sgpmwrtipB6.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/1998 | 0000 | 07/30/1999 | 2359 |
| Subject: | TWP/MWR/C2 - Uncertainty in clock time |
| DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1 |
| Description: | At ARCS2, the MWR computer clock was not being updated because no NTP time service software was installed on the computer. During Nauru99, on 6/24/99, the clock was found to be 3 minutes and 17 seconds fast. Assuming that the time was properly set at installation on 10/26/98 (which is not indicated in the installation report) and never reset until 6/24/99, the rate of time drift on the computer was about +0.8 seconds per day. However, if the time was not reset since integration at AIS on 1/14/98 (which is recorded in my integration notes), then the rate of drift is about +0.4 seconds per day. The computer was replaced and time service started on 7/30/99. |
| Measurements: | twpmwrlosC2.b1:
twpmwrtipC2.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/28/1998 | 0000 | 11/19/1998 | 0500 |
| Subject: | TWP/MWR/C2 - Software Change |
| DataStreams: | twpmwrlosC2.b1 |
| Description: | The MWR operating software was changed on 19 November 1998 to provide additional functionality as described below. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated, and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves. |
| Measurements: | twpmwrlosC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/29/1998 | 0000 | 08/12/1999 | 2359 |
| Subject: | SGP/MWR/B1/B4/B5/B6 - data file split at 23:59 |
| DataStreams: | sgpmwrlosB1.a1, sgpmwrlosB1.b1, sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosB5.a1, sgpmwrlosB5.b1, sgpmwrlosB6.a1, sgpmwrlosB6.b1, sgpmwrtipB1.a1, sgpmwrtipB4.a1, sgpmwrtipB5.a1, sgpmwrtipB6.a1 |
| Description: | A problem with the MWR operating software has been corrected. However, several files were generated that contain one record of data collected at midnight but labeled with the previous day's date. |
| Measurements: | sgpmwrlosB5.a1:
sgpmwrlosB1.a1:
sgpmwrtipB6.a1:
sgpmwrlosB6.b1:
sgpmwrlosB4.b1:
sgpmwrtipB4.a1:
sgpmwrtipB5.a1:
sgpmwrlosB1.b1:
sgpmwrtipB1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB5.b1:
sgpmwrlosB6.a1:
|