DQRID : D930922.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/12/1993162009/22/19931530Suspect
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Subject:
SGP/EBBR/E8 - Pressure spikes at Coldwater
DataStreams:sgp5ebbrE8.b1
Description:
From at least 29 May 1993 at 1600 through 22 Sept 1993 (when it was
replaced) the barometric pressure sensor at site 8 (Coldwater), EBBR05 has
exhibited spikes of up to 0.7 kPa at a frequency of once per day to once
per two weeks.  This condition is very similar to that observed at the
Ashton and Central Facility EBBRs earlier this year (reference my CAR of
July 14, 1993).  The spikes in no way invalidate any of the calculations in
which pressure is used by the EBBR, because the calculations are not very
sensitive to such small differences in pressure.  The spikes can be easily
seen by comparison with the SMOS barometric pressure sensor.  Caution
should be used when using the Coldwater EBBR pressure data from the period
in question for anything but EBBR considerations.

In my July 14, 1993 CAR I suggested that an electronic component in the
pressure sensors might not be functioning properly.  However, the
manufacturer did not find such a malfunction in the sensors removed earlier
  The Coldwater sensor will be sent back to the manufacturer for
evaluation and recalibration.

I should add as a point of information here that these "small" spikes
cannot easily be detected by only looking at the EBBR data.  Small spikes
in pressure are not uncommon.  Only when compared to a colocated SMOS is it
obvious that the spikes do not reflect actual pressure changes.

(Revision 1.1, 2/26/93 dkg)
Suggestions: 
This DQR was originally submitted as a PIF No. P930922.1
Measurements:sgp5ebbrE8.b1:
  • vapor_pressure_top
  • atmos_pressure
  • vapor_pressure_bottom
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