| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000127.1 | TWP/MWR/C2 - Uncertainty in clock time | twpmwrlosC2.b1, twpmwrtipC2.a1 |
| D010227.4 | TWP/MWR/C2 - Excessive wet_window flags | twpmwrlosC2.b1, twpmwrtipC2.a1 |
| D060420.10 | TWP/MWR/C2 - software upgrade (version 3.29) | twpmwrlosC2.b1 |
| D061121.1 | TWP/MWR/C2 - Missing Data | twpmwrlosC2.b1 |
| 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: | twpmwrtipC2.a1:
twpmwrlosC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/16/1999 | 0900 | 03/08/1999 | 2100 |
| 11/16/1999 | 0900 | 02/09/2000 | 2100 |
| 12/07/2000 | 0000 | 12/17/2000 | 2359 |
| Subject: | TWP/MWR/C2 - Excessive wet_window flags |
| DataStreams: | twpmwrlosC2.b1, twpmwrtipC2.a1 |
| Description: | The wet_window flag is set high more than expected from the measured value of liquid water path. This may be caused by dew or, if the heater sensivity is slightly misadjusted, by the diurnal variation in ambient temperature. The "wet_window" flag is an indicator of moisture on the MWR window which invalidates the measurements of precipitable water vapor and liquid water path. Sometimes this flag can be incorrectly set high or low if the heater sensivity is slightly misadjusted. The heater adjustment is a resistive device that is dependent on ambient temperature. Another indicator of moisture on the window is unreasonably high ( > 3*liquid_retrieval_rms_accuracy ) values of "liq". |
| Measurements: | twpmwrtipC2.a1:
twpmwrlosC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/28/1998 | 0000 | 07/30/1999 | 1200 |
| Subject: | TWP/MWR/C2 - software upgrade (version 3.29) |
| DataStreams: | twpmwrlosC2.b1 |
| Description: | The MWR operating program was upgraded to version 3.29 on 30 July 1999. This version included a beam width correction as well as provided the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. The data prior to July 30 1999 do not include beam-width and mirror-leveling corrections. |
| Measurements: | twpmwrlosC2.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/02/1998 | 2112 | 11/06/1998 | 2140 |
| 07/02/2000 | 2000 | 07/04/2000 | 0047 |
| 02/09/2002 | 2300 | 02/11/2002 | 2300 |
| 01/23/2004 | 1100 | 01/27/2004 | 1957 |
| 05/27/2005 | 1143 | 05/29/2005 | 2132 |
| Subject: | TWP/MWR/C2 - Missing Data |
| DataStreams: | twpmwrlosC2.b1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | twpmwrlosC2.b1:
|