DQR ID | Subject | Data Streams Affected |
---|---|---|
D060928.4 | NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry | nsasondewnpnC1.b1 |
D080512.2 | NSA/MWR/C2 - Possible bias on measurements | nsamwrlosC2.b1, nsamwrtipC2.a1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/2006 | 0500 | 12/31/9999 | 2359 |
Subject: | NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry |
DataStreams: | nsasondewnpnC1.b1 |
Description: | The output precision of the following variables was increased 20060929: alt changed from 1m to 0.1m dp changed from 0.1degC to 0.01degC pres changed from 0.1 hPa to 0.01 hPa RH changed from 1%RH to 0.01%RH tdry changed from .1degC to 0.01degC Note that the increase in precision does not necessarily imply an increase in accuracy. Users are cautioned to continue to use their best scientific judgement when using these or any other data. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/15/2008 | 1500 | 11/16/2009 | 1600 |
Subject: | NSA/MWR/C2 - Possible bias on measurements |
DataStreams: | nsamwrlosC2.b1, nsamwrtipC2.a1 |
Description: | This instrument was refurbished at the the vendor's facility in 2008 and then sent to the SGP for side-by-side comparison with another MWR. During the time the instrument was at the SGP, it was noticed that the 23.8-GHz measurements were slightly warmer than those from radiometer SN10 operating at the SGP Central Facility. A comparison with radiosonde measurements confirmed the slight change in the measurements. An explanation of the bias and comparison with radiosonde measurements and radiometer SN 10 is given in the mentor's monthly data review for the month of April 2008. Since there aren't radiosondes at NSA.C2, it is difficult to work around this problem. Based on comparison at the SGP, the bias in the 23.8-GHz channel was quantified to be ~1.5 K. Users can attempt to subtract this amount from the 23.8-GHz measurements. Alternatively, use the retrieved PWV and LWV keeping in mind that there is a possible overestimation of PWV of ~1 mm. On 11/16/2009 after a hardware failure of the radiometer a spare radiometer (SN15) was installed at the site. |
Measurements: | nsamwrlosC2.b1:
nsamwrtipC2.a1:
|