DQRID : D120911.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/02/2012190004/24/20121900Suspect
more
Subject:
SGP/MFRSR/E34 - Problem with nighttime offset values
DataStreams:sgpmfrsrE34.b1, sgpmfrsrE34.a0
Description:
Sensor offset values are calculated each night, and at SGP, are applied at 1900 UTC each 
day.  Typically there is very little variation from night-to-night.  At EF-34 we were 
seeing significant steps in the data at 1900 UTC that were attributed to the offset values 
changing substantially.  The cause looks like it might be the linear heater board that was 
in place during the period covered by this DQR.  Note that we replaced the heater board 
on 20120702 which is a bit more than two months after the end of this DQR.  No steps were 
seen after 20120424.  The reason likely being by the 24th it was well into spring and 
approaching summer, and large air temperature changes from day-to-day were not occurring.

Without getting into the gory details here, nighttime offset values are strongly 
influenced by ambient temperature.  Below is a list of days when a step is seen at 1900 UTC:

201201: 2, 3, 5, 12, 17, 26
201202: 5, 11, 24, 26
201203: 13
201204: 24
Suggestions: 
Contact the mentor to discuss how one might use the data in this DQR.  Most of the 

days are almost certainly perfectly good data.
Measurements:sgpmfrsrE34.a0:
  • direct_horizontal_broadband
  • hemisp_narrowband_filter4_raw
  • hemisp_narrowband_filter3_raw
  • diffuse_hemisp_narrowband_filter4
  • diffuse_hemisp_narrowband_filter5
  • diffuse_hemisp_narrowband_filter6
  • hemisp_narrowband_filter6_raw
  • diffuse_hemisp_narrowband_filter6_raw
  • hemisp_narrowband_filter5_raw
  • diffuse_hemisp_narrowband_filter5_raw
  • diffuse_hemisp_narrowband_filter1
  • diffuse_hemisp_narrowband_filter2
  • diffuse_hemisp_narrowband_filter3
  • hemisp_broadband_raw
  • diffuse_hemisp_narrowband_filter4_raw
  • diffuse_hemisp_broadband
  • direct_horizontal_narrowband_filter5
  • direct_horizontal_narrowband_filter6
  • direct_horizontal_narrowband_filter3
  • direct_horizontal_narrowband_filter4
  • direct_horizontal_narrowband_filter1
  • direct_horizontal_narrowband_filter2
  • diffuse_hemisp_narrowband_filter3_raw
  • hemisp_narrowband_filter5
  • hemisp_narrowband_filter6
  • hemisp_narrowband_filter3
  • hemisp_narrowband_filter4
  • hemisp_narrowband_filter1
  • hemisp_narrowband_filter2_raw
  • hemisp_narrowband_filter2
  • diffuse_hemisp_narrowband_filter2_raw
  • diffuse_hemisp_broadband_raw
  • hemisp_narrowband_filter1_raw
  • hemisp_broadband
  • diffuse_hemisp_narrowband_filter1_raw
more
sgpmfrsrE34.b1:
  • direct_normal_narrowband_filter2
  • direct_normal_narrowband_filter3
  • direct_normal_narrowband_filter1
  • direct_normal_narrowband_filter6
  • direct_normal_narrowband_filter4
  • direct_normal_narrowband_filter5
  • hemisp_narrowband_filter1
  • hemisp_narrowband_filter2
  • hemisp_narrowband_filter3
  • hemisp_narrowband_filter4
  • hemisp_narrowband_filter5
  • hemisp_narrowband_filter6
  • direct_diffuse_ratio_broadband
  • direct_diffuse_ratio_filter1
  • direct_diffuse_ratio_filter3
  • direct_diffuse_ratio_filter2
  • direct_diffuse_ratio_filter5
  • direct_diffuse_ratio_filter4
  • direct_horizontal_narrowband_filter3
  • direct_horizontal_narrowband_filter4
  • direct_horizontal_narrowband_filter1
  • direct_horizontal_narrowband_filter2
  • hemisp_broadband
  • direct_horizontal_narrowband_filter5
  • direct_horizontal_narrowband_filter6
  • diffuse_hemisp_narrowband_filter1
  • diffuse_hemisp_narrowband_filter2
  • diffuse_hemisp_narrowband_filter3
  • direct_horizontal_broadband
  • direct_diffuse_ratio_filter6
  • diffuse_hemisp_broadband
  • diffuse_hemisp_narrowband_filter4
  • direct_normal_broadband
  • diffuse_hemisp_narrowband_filter5
  • diffuse_hemisp_narrowband_filter6
more

Close this window