DQR ID | Subject | Data Streams Affected |
---|---|---|
D100222.1 | GRW/WACR/M1 - Interference/False signal | grwwacrM1.b1, grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
D100729.5 | GRW/WACR/M1 - Reprocessed: Reflectivity and Height Offsets | grwwacrM1.b1, grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
D120301.1 | GRW/WACR/M1 - Transmit power drop outs | grwwacrM1.b1, grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
D130725.3 | GRW/WACR/M1 - Incorrect value for antenna_altitude global attribute | grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/25/2009 | 0945 | 10/03/2009 | 1200 |
Subject: | GRW/WACR/M1 - Interference/False signal |
DataStreams: | grwwacrM1.b1, grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
Description: | Interference occurred between the WACR/SWACR beginning 9:45 GMT on 09/25. This effect was not as noticeable on DQ plots until ~10 GMT on 09/27 at which time the interference was quite pronounced as vertical bands in the reflectivity and velocity plots. The interference was slightly noticeable in the spectral width plots as well. Interference resulted from the SWACR using the same frequency as the WACR. Interference was alleviated by changing the pulse repetition frequency (prf) from 10 kHz to 9.9 kHz. Some minor contamination still existed during the presence of highly reflective clouds/precipitation. The Doppler velocity was not affected as much by the interference. A cloud mask based on the Doppler velocity will remove most of this contamination in the reflectivity and spectra width measurements. |
Measurements: | grwwacrspeccmaskcopolM1.a0:
grwwacrM1.b1:
grwwacrspeccmaskxpolM1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/14/2009 | 0000 | 01/06/2011 | 0800 |
Subject: | GRW/WACR/M1 - Reprocessed: Reflectivity and Height Offsets |
DataStreams: | grwwacrM1.b1, grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
Description: | The instrument vendor informed us of a range (height) offset of 13 m and provided updated reflectivity calibration. All values reported for 'Reflectivity' were approximately 3 dB too low. In addition, the Reflectivity in the first and fourth range gates (starting from the surface) needed to be further corrected by an additional 2.7 and -0.9 dB, respectively. The 'height' field values were 13.33 m too low. The data were reprocessed to correct these problems. The grwwacrM1.b1 data were reprocessed and archived in October 2010. The grwwacrspeccmaskcopolM1.a0 and grwwacrspeccmaskxpolM1.a0 data were reprocessed and archived in January 2012. |
Measurements: | grwwacrspeccmaskcopolM1.a0:
grwwacrM1.b1:
grwwacrspeccmaskxpolM1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/27/2009 | 1627 | 10/19/2010 | 1237 |
Subject: | GRW/WACR/M1 - Transmit power drop outs |
DataStreams: | grwwacrM1.b1, grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
Description: | At approximately 16:27 GMT on 20090727, txpower began intermittently dropping out and reporting slightly negative values. This issue continued intermittently through 20090807 when it stopped occurring. The problem resumed 20091006 and continued to occur on a daily basis until the monitor detector was replaced 20101019. The transmit power as measured by the detector after replacement was approximately 1.3 dB less than when it failed. Reflectivity measurements have a +0/-1.3 dBZ of additional uncertainty for this period of time. |
Measurements: | grwwacrspeccmaskcopolM1.a0:
grwwacrM1.b1:
grwwacrspeccmaskxpolM1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/14/2009 | 1813 | 10/06/2011 | 0859 |
Subject: | GRW/WACR/M1 - Incorrect value for antenna_altitude global attribute |
DataStreams: | grwwacrspeccmaskcopolM1.a0, grwwacrspeccmaskxpolM1.a0 |
Description: | The global attribute antenna_altitude is incorrect. The correct value should be 3.8608 m. This is the height of the WACR antenna above the ground. The value is used, along with site altitude, in converting heights above MSL to range above the radar antenna. |
Measurements: | grwwacrspeccmaskcopolM1.a0:
grwwacrspeccmaskxpolM1.a0:
|