DQRID : D101026.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/12/2002000006/07/20102359Does not affect quality
more
Subject:
TWP/QCRAD/C1/C2/C3  - error in qc flags
DataStreams:twpqcrad1longC3.c1, twpqcrad1longC1.c1, twpqcrad1longC2.c1
Description:
In the qc_down_short_diffuse_hemisp field, QC failures from the test indicated by bit_13, 
"data failed tracker off test", were set incorrectly as bit_9, "GSW2SumSW (93 > SZA > 75 
and SumSW > 50; GSW/SumSW < 0.85 or GSW/SumSW > 1.15)".  Solar tracker failures are 
correctly indicated in the aqc_down_short_diffuse_hemisp field. 

In the qc_short_direct_normal field, QC failures from the test indicated by bit_10, "data 
failed tracker off test", were set incorrectly as bit_9, "GSW2SumSW (93 > SZA > 75 and 
SumSW > 50; GSW/ SumSW < 0.85 or GSW/SumSW > 1.15)".  Solar tracker failures are correctly 
indicated in the aqc_short_direct_normal field. 

This is a software problem in the VAP that impacts all dates for which a solar tracker 
failure occurred prior to 20100608 for each facility.  The 20020312 start date was chosen 
because the DQR system can not link multiple start/end date/times with multiple facilities 
within the same report.  As a result, the latest start date corresponding to C3 was 
chosen. The actual start dates for which this problem could have occurred for each facility 
are as follows:

C1:  19961010
C2:  19981029
C3:  20020312

Please note that if a solar tracker failure is not indicated by the 
aqc_down_short_diffuse_hemisp and/or aqc_short_direct_normal fields you can ignore this DQR.
Suggestions: 
For down_short_diffuse_hemisp use the auxiliary QC fields 

aqc_down_short_diffuse_hemisp, aqc_GSW2SumSW, and aqc_DifSW2GSW.

For short_direct_normal use the auxiliary QC fields aqc_short_direct_normal, aqc_GSW2SumSW, and aqc_DifSW2GSW.

For down_short_diffuse_hemisp use the auxiliary QC fields 
aqc_down_short_diff
use_hemisp, aqc_GSW2SumSW, and aqc_DifSW2GSW.

For short_direct_normal use the auxiliary QC fields aqc_short_direct_normal, aqc_GSW2SumSW, and aqc_DifSW2GSW.
Measurements:twpqcrad1longC2.c1:
  • short_direct_normal
  • down_short_diffuse_hemisp
more
twpqcrad1longC1.c1:
  • short_direct_normal
  • down_short_diffuse_hemisp
more
twpqcrad1longC3.c1:
  • short_direct_normal
  • down_short_diffuse_hemisp
more

Close this window