Data Quality Report for Order ID: 187374
User ID: sisodiyaa1    Date completed: 2017-08-21
All DQRs
DQR ID Subject Affected Data Streams Data Quality Metric
D161028.4 AWR/MPLCMASK/M1 - Reprocess: Software Error awr30smplcmask1zwangM1.c1 Note
D170802.9 AWR/MPL/MPLCMASK/M1 - awr30smplcmask1zwangM1.c1 Suspect
D170802.2 AWR/MPLCMASK/M1 - Reprocess: Instrument correction error awr30smplcmask1zwangM1.c1 Suspect
 
DQR ID: D161028.4    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2016-05-01 01:48:00 2016-08-13 02:18:00 Note
Subject: AWR/MPLCMASK/M1 - Reprocess: Software Error
Affected Datastreams: awr30smplcmask1zwangM1.c1
Description The MPLCMASK VAP was expecting the MPL to be covered around local solar noon. As a result, the algorithm intermittently set much of the data to -9999 during this time period after the site transitioned to total darkness during the winter months. During the peak of this problem, the impacted fields were set to -9999 from approximately 0:00-2:19 UTC each day. This information is being provided in a transparent DQR due to the intermittent nature of the problem and the fact that the impacted data are already set to -9999 and flagged by the automated quality control variables in the VAP. A future reprocessing task will correct this problem.
Measurements
  • linear_depol_ratio (Linear depolarization ratio)
  • cloud_top (Highest cloud top height above ground level (AGL))
  • linear_depol_snr (Signal to noise ratio for the linear depolarization ratio)
  • cloud_base (Lowest cloud base height above ground level (AGL))
  • backscatter_snr (Signal to noise ratio of backscatter)
  • cloud_mask (Cloud mask)
  • shots_summed (Number of lidar pulses summed)
  • num_cloud_layers (Number of cloud layers)
  • cloud_base_layer (Cloud base for each layer)
  • backscatter (Total attenuated backscatter)
  • cloud_top_attenuation_flag (Flag indicating whether the beam was extinguished at indicated cloud top)
  • cloud_top_layer (Cloud top for each layer above ground level (AGL))
 
DQR ID: D170802.9    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2015-12-01 00:00:00 2017-01-03 23:59:59 Suspect
Subject: AWR/MPL/MPLCMASK/M1 -
Affected Datastreams: awr30smplcmask1zwangM1.c1
Description Values for the linear depolarization ratio (LDR) have been identified as too high. An error in the LDR indicates one or both of the backscatter cross or backscatter copol signals are not correct. Backscatter and LDR data should be treated qualitatively unless a correction is applied.
Measurements
  • backscatter_snr (Signal to noise ratio of backscatter)
  • linear_depol_snr (Signal to noise ratio for the linear depolarization ratio)
  • linear_depol_ratio (Linear depolarization ratio)
  • backscatter (Total attenuated backscatter)
 
DQR ID: D170802.2    (Back to Top)
Start Date Start Time End Date End Time Data Quality Metric
2015-12-01 00:00:00 2017-01-03 23:59:59 Suspect
Subject: AWR/MPLCMASK/M1 - Reprocess: Instrument correction error
Affected Datastreams: awr30smplcmask1zwangM1.c1
Description Overlap and dead-time instrument corrections in the 30smplcmask1zwang VAP were not applied in the correct order. As a result, very high backscatter signals near 500 m can sometimes exceed the acceptable maximum signal for applying a dead-time correction. Regions, where the dead-time correction is not applied, appear as an artificial band or artifact. Cloud detection is not impacted by this issue.
Measurements
  • backscatter_snr (Signal to noise ratio of backscatter)
  • linear_depol_snr (Signal to noise ratio for the linear depolarization ratio)
  • linear_depol_ratio (Linear depolarization ratio)
  • backscatter (Total attenuated backscatter)