Description: | DQR No: Platform: sgpsondeC1
Subject: Questionable RH: sounding C1 03/07/97:1427
Date Submitted: 3/18/97
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other - Site Ops
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509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1.A1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 03/07/97 Time 14:27 (GMT)
End Date Time (GMT)
Data should be labeled:
_X__ questionable _?_ All data fields affected
_X__ incorrect _X_ Only some data fields affected
_?_ wrong calibration
___ others
Discussion of Problem:
David Cook pointed out that the RH values for the subject sounding disagree
substantially with values reported at the 60m tower. Review of the sounding
data shows saturation (100%) values reported at the surface and during
most of the sounding. The site ops log shows RH values of between 68% (1400)
and 52% (1500) at the surface. Surface temperature (8.4) and pressure (983.0)
obtained from the sonde are not substantially different from the surface
observations (7.8/10.8) and (982.7/982.4) at 1400 and 1500 respectively, so
it is unlikely that an incorrect calibration tape was used for the sonde.
I think the conclusion must be that the RH sensor on this sonde was bad.
As an operational issue, this sonde should have been rejected by site ops
because the surface RH value of 100% is more than 7% different than the surface
value obtained from an independent reference instrument. I will check the
procedures that I have provided to site ops to be sure that I included this
criterion.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |