DQRID : D040329.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/21/2004120003/24/20040200Incorrect
more
Subject:
SGP/SIRS/E21 - Instrument logger time problem, Unknown
DataStreams:sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0
Description:
Values of diffuse hemispheric shortwave radiation differ from derived values by at most 70 
Wm^(-2).  The incident appears to be isolated to 3/21, 3/22, and 3/23. An estimation of 
solar noon using downwelling shortwave hemispheric irradiance from the PSP shows solar 
noon to oocur at around 1845GMT on 3/21. Calculated solar noon occurs at E21 at 1831GMT for 
3/21/2004.  There appears to be a time discrepancy in the datalogger for these dates.  
04/01 is the next date with enough sun to determine solar noon and compare to calculated.  
The data from this date appears correct.  Ronald Reed [rreed@ops.sgp.arm.gov] reports 
the logger did not receive any reportable time updates during the late March time period.  
We don't know what happened during these three dates but from 3/24 on data looks acceptable.
Suggestions: 
Disregard this data.
Measurements:sgpsirs20sE21.a0:
  • inst_diffuse
  • inst_down_long_hemisp_shaded_tp
  • inst_up_long_dome_resist
  • inst_up_long_hemisp_tp
  • inst_down_long_shaded_case_resist
  • inst_direct_normal
  • inst_down_long_shaded_dome_resist
  • inst_up_long_case_resist
  • inst_up_short_hemisp
  • inst_global
  • time_offset
more
sgpsirsE21.00:
  • Raw data stream - documentation not supported
more
sgpsirsE21.b1:
  • up_short_hemisp_max
  • up_long_hemisp_min
  • down_short_hemisp
  • up_short_hemisp_std
  • time_offset
  • down_short_hemisp_std
  • down_short_hemisp_max
  • up_long_hemisp
  • up_short_hemisp_min
  • up_long_netir
  • inst_down_long_shaded_dome_temp
  • down_long_hemisp_shaded_min
  • short_direct_normal_std
  • down_long_hemisp_shaded
  • short_direct_normal_max
  • down_short_diffuse_hemisp_min
  • inst_up_long_case_temp
  • down_short_diffuse_hemisp_max
  • short_direct_normal
  • down_short_diffuse_hemisp
  • up_short_hemisp
  • down_long_hemisp_shaded_std
  • down_long_hemisp_shaded_max
  • down_short_diffuse_hemisp_std
  • short_direct_normal_min
  • up_long_hemisp_std
  • up_long_hemisp_max
  • down_long_netir
  • inst_down_long_shaded_case_temp
  • down_short_hemisp_min
  • inst_up_long_dome_temp
more

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