| Description: | DQR No: Platform: EBBR
Subject: Annual Calibration Changeout - E7, Elk Falls, KS
Date Submitted: December 21, 1995
Submitted By: _x_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: EBBR/Changeout
What level data: (raw,a0,a1,b1,c1 etc): a1 (5 and 30 minute)
a0 (15 minute)
What location was the data collected at: E7, Elk Falls, KS
Period of time in question
Begin Date 11/02/95 Time 1530 GMT
End Date 11/28/95 Time 2200 GMT
Data should be labeled:
___ questionable ___ All data fields affected
part of the period)
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
On November 2, 1995 the changeout for annual calibration occurred at E7,
Elk Falls, KS. SEBS unit 9 was removed and unit 12 was installed. Between
1530 and 1930 GMT no data was collected. The soil moisture probes were
shipped dry from the vendor. Site operations did not realize this and
installed them without wetting the bags that hold the soil moisture probes
in soil. The water did not penetrate into the bags of soil. Therefore, some
soil moisture probe outputs were initially offscale. Different soil
moisture probes indicated offscale at different times until 28 November
1995. On 28 November, site operations soaked the soil moisture probe bags
with water, causing the soil moisture data values to come on scale.
No data was collected during the time of the installation on November 2,
between 1530 and 1930 GMT.
The incorrect soil moisture after SEBS 12 was installed affected numerous
data values including:
15 minute: rr_sm1, rr_sm2, rr_sm3, rr_sm4, rr_sm5
30 minute: h, e, ave_shf, shf1, shf2, shf3, shf4, shf5, sm1, sm2, sm3,
sm4, sm5, cs1, cs2, cs3, cs4, cs5, ces1, ces2, ces3, ces4,
g1, g2, g3, g4, g5.
Inspection of the data readily shows which soil moisture probes were
offscale. When one or more were offscale, the e, h, and ave_shf data and the
respective numbered data variables above were incorrect. h and e can be
recalculated using only correct soil moisture probe values and equations shown
in many previous DQRs.
Other observations/measurements impacted by this problem:
see above
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data with this comment.
Data Processing Notes Date
-------------------------------------------------------------------
END |