DQR ID | Subject | Data Streams Affected |
---|---|---|
D080428.3 | TWP/SMET/C3 - Reprocess: ORG Data has very small rainrate values | twpsmet60sC3.b1 |
D110304.1 | TWP/MMCR/C3 - Antenna gain/beamwidth uncertainty | twpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/01/2004 | 0000 | 06/30/2010 | 2359 |
Subject: | TWP/SMET/C3 - Reprocess: ORG Data has very small rainrate values |
DataStreams: | twpsmet60sC3.b1 |
Description: | The ORG data is collected via analog signal and not digital. Therefore, we continuously collect data even when no rain is occurring. We also capture small events such as leaves, large bugs, dust, etc blowing through the measurement path. Because this discrete event occurs quickly the value is usually captured for 1 or 2 seconds. This value is then averaged to the minute producing rainrate on the order of .009 mm/hr or less. These values are not indicative of rain and should be removed from the record or summing over long periods can bias the climate record. We will reprocess the data to remove these small values. |
Measurements: | twpsmet60sC3.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/29/2010 | 0430 | 02/27/2011 | 0600 |
Subject: | TWP/MMCR/C3 - Antenna gain/beamwidth uncertainty |
DataStreams: | twpmmcrmomC3.00, twpmmcrmomC3.b1, twpmmcrspecmomC3.a0 |
Description: | Upon installing the KAZR at Darwin, we found that the antenna's subreflector was loose. Based on measurements from the manufacturer, a 0.001" change can change the antenna gain of approximately 1 dB. This adds an uncertainty of 2 dBZ reflectivity measurements. We measured slightly more than 0.100" off nominal position. However the manufacturer does not measure the subreflector location for each antenna so we do not know how far off, if at all, the subreflector is from its position when it was characterized at the test range. We have contacted CSIRO and are investigating the possibility of sending the antenna to their near-field antenna test range. In several months we will also have a Ka-SACR at Darwin that will enable us to do a cross-calibration. |
Measurements: | twpmmcrmomC3.b1:
twpmmcrspecmomC3.a0:
twpmmcrmomC3.00:
|