| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/09/1998 | 1757 | 02/09/1998 | 1659 | Incorrect |
| Subject: | SGP/MWR/B5 - Reprocess: Calibration update |
| DataStreams: | sgpmwrtipB5.a0, sgpmwrlosB5.a1, sgpmwrlosB5.a0 |
| Description: | With the MWR at Morris, there appears to be a very large (~0.5mm) positive bias in the LWP
and the PWV values are much larger (~4cm) than reported by the soundings. Recent repairs
by the manufacturer appear to have significantly changed the calibration.
The tip data acquired during the SCM IOP on 29-30 January at Morris have been reduced. It
was updated at 17:00 on 9 February. The calibration will be closely monitored to
determine if the previouly-reported (P971104.1) drift in the 31.4 GHz channel has been corrected.
The table below compares the latest calibration with previous ones.
23.8 GHz 31.4 GHz
----------------------- -----------------------
Date Location Tips Tnd(K) tc(K/K) err(K) Tnd(K) tc(K/K) err(K)
Jun 97 B5/Morris 2566 168.85 -0.071 0.33 186.15 -0.005 0.24
Aug 97 B5/Morris 1229 169.97 -0.103 0.31 188.45 -0.029 0.19
Nov 97 B5/Morris 3420 169.17 -0.082 0.24 188.76 +0.003 0.20
Jan 98 B5/Morris 2340 218.64 -0.107 0.23 219.41 +0.007 0.18
The data collected since the instrument was reinstalled on 9 January until the calibration
was updated will need to be reprocessed. |
| Suggestions: | |
| Measurements: | sgpmwrtipB5.a0: more
sgpmwrlosB5.a1: more sgpmwrlosB5.a0: more |