Data Quality Reports for Session: 184103 User: balmesk1 Completed: 03/09/2017


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D110409.1SGP/RL/C1 - Incorrect time arraysgprlprofmerge1turnC1.c0Incorrect
D110720.1SGP/RL/C1 - Malfunction in WFOV data acquisitionsgprlprofmerge1turnC1.c0Incorrect
D111004.1SGP/RL/C1 - Frequent intermittent drop-outs in the WFOV photon counting signalssgprlprofmerge1turnC1.c0Incorrect
D111004.3SGP/RL/C1 - Bad shot count datasgprlprofmerge1turnC1.c0Incorrect
D140221.8SGP/RL/C1 - Reprocessing Notice (RID 1026)sgprlprofmerge1turnC1.c0Does not affect quality
D140326.7SGP/RLPROF/C1 - Reduced signal due to partially closed laser shuttersgprlprofmerge1turnC1.c0Suspect
D140416.3SGP/RLPROF/C1 - Reduced SNR due to partial laser blockagesgprlprofmerge1turnC1.c0Suspect
D140619.4SGP/RLPROF/C1 - Invalid data due to hatch closuresgprlprofmerge1turnC1.c0Incorrect


DQRID : D110409.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/27/2011010003/29/20111300Incorrect
Subject:
SGP/RL/C1 - Incorrect time array
DataStreams:sgprlprofmerge1turnC1.c0
Description:
On March 27 2011 at 0100 GMT the Raman lidar's instrument computer automatically advanced 
it's time by one hour (transition to daylight savings time). The problem was eventually 
fixed on March 29 2011 at 1300 when the clock was set back one hour to the correct time. 
The ingest experienced problems when the clock was set back one hour.

The time arrays in the following files are set one hour ahead of what they should be:

1. sgprlC1.a0.20110327.000001.cdf for profile indices equal to or greater than 355
2. all of sgprlC1.a0.20110327.120001.cdf
3. all of sgprlC1.a0.20110328.134549.cdf
4. all of sgprlC1.a0.20110329.000005.cdf
5. sgprlC1.a0.20110329.120005.cdf for profile indices less than or equal to 72 

Also, the time arrays in sgprlC1.a0.20110329.120005.cdf between profile indices 73 through 
641 are incorrect. In this case, the offset varies approximately linearly with profile 
index from 1 hour at index 73 to 0 at index 641. The ingest apparently introduced some 
unphysical variations in time in this part of the file.
Measurements:sgprlprofmerge1turnC1.c0:
  • time
  • time_offset
  • base_time


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DQRID : D110720.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/31/2011140008/23/20112011Incorrect
Subject:
SGP/RL/C1 - Malfunction in WFOV data acquisition
DataStreams:sgprlprofmerge1turnC1.c0
Description:
A malfunction in the data acquisition hardware resulted in corrupted data in the 
wide-field-of-view (WFOV) nitrogen, water vapor and elastic channels. The problem is so serious as 
to yield these signals useless during the period covered by this DQR.

Do not use any data products derived from the WFOV raw signals during the period covered 
by this DQR. This includes water vapor mixing ratio, aerosol scattering ratio, and aerosol 
extinction. 

The narrow-field-of-view (NFOV)channels are unaffected by this problem. So data products 
derived from only the NFOV channel should be okay. These include the 'high' channel 
signals from the merge VAP, depolarization and temperature.
Measurements:sgprlprofmerge1turnC1.c0:
  • elastic_counts_low_glue_coef_slope
  • parameters_elastic_low
  • parameters_nitrogen_low
  • nitrogen_counts_low_glue_coef_slope
  • water_counts_low_glue_coef_slope
  • parameters_water_low
  • nitrogen_counts_low_glue_coef_offset
  • elastic_counts_low_glue_coef_offset
  • water_counts_low_glue_coef_offset
  • Merged count rate for nitrogen counts low(nitrogen_counts_low)
  • Merged count rate for water counts low(water_counts_low)
  • Merged count rate for elastic counts low(elastic_counts_low)


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DQRID : D111004.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/31/2011133008/19/20111900Incorrect
Subject:
SGP/RL/C1 - Frequent intermittent drop-outs in the WFOV photon counting signals
DataStreams:sgprlprofmerge1turnC1.c0
Description:
Beginning suddenly, near 1330 UTC on 31 May 2011, the liquid water and all three WFOV 
channels began showing intermittent and frequent “drop-outs” in the photon counting signals. 
These drop-outs were periods when the signal would momentarily fade and then come back. 

This problem, which was traced to a malfunction of the Licel data recorders, occurred at 
irregular intervals and with such frequency as to render the data from the affected 
channels useless. This problem persisted until repairs were made to the Licel transient 
recorders on 19 August 2011. 

Although only the WFOV channels (and liquid water channel) were affected, the aerosol and 
water vapor mixing ratio VAPs are computed by combining NFOV and WFOV channels. Thus, all 
of these higher level data products were adversely impacted by the drop-out problem.

The NFOV data in the sgprlC1.a0 and sgprlprofmerge1turnC1.c0 datastreams were unaffected 
by the "drop-out" problem. These signals could be used to compute aerosol optical 
properties and water vapor mixing ratio.
Measurements:sgprlprofmerge1turnC1.c0:
  • parameters_elastic_low
  • solar_background_nitrogen_low
  • water_counts_low_glue_coef_offset
  • elastic_counts_low_glue_coef_slope
  • electronic_background_nitrogen_analog_low
  • solar_background_water_low
  • nitrogen_counts_low_glue_coef_slope
  • water_counts_low_glue_coef_slope
  • parameters_water_low
  • solar_offset_nudge_nl
  • Merged count rate for elastic counts low(elastic_counts_low)
  • liquid_counts_high_glue_coef_slope
  • solar_offset_nudge_lw
  • liquid_counts_high
  • solar_offset_nudge_wl
  • electronic_background_elastic_analog_low
  • electronic_background_water_analog_low
  • liquid_counts_high_glue_coef_offset
  • solar_offset_nudge_el
  • parameters_nitrogen_low
  • elastic_counts_low_glue_coef_offset
  • nitrogen_counts_low_glue_coef_offset
  • Merged count rate for nitrogen counts low(nitrogen_counts_low)
  • Merged count rate for water counts low(water_counts_low)
  • solar_background_elastic_low


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DQRID : D111004.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/29/2011000010/06/20111500Incorrect
07/15/2011100007/15/20111400Incorrect
05/03/2012143006/12/20121930Incorrect
08/08/2011130009/15/20110000Incorrect
Subject:
SGP/RL/C1 - Bad shot count data
DataStreams:sgprlprofmerge1turnC1.c0
Description:
The number of laser pulses averaged per profile, or shot count, exhibited erratic behavior 
during the periods in question. The values reported in the sgprlC1.a0 datastream were 
incorrect and varied radically from profile to profile. Shot counts are used in the Merge 
VAP to compute photon count rates, which are then used by all the other RL VAPs. Thus, the 
shot count problem renders all of the RL VAPs bad or suspect during the periods in question.
It appears that the problem was caused as the signal on the line between two triggering 
units got noisier over time, causing the second unit to occasionally trigger on noise. The 
second unit triggers the Licel electronics. So the false triggering on the second unit 
caused false shot count readings. On 6 October 2011 the trigger level was adjusted by the 
on-site technician, and this solved the problem.


On 3 May 2012 the DG535 pulse generator, which is used to trigger the Licel data 
recorders, was swapped out with a spare. After installation of the spare, the system started 
recording erroneous values of shot counts. The problem was fixed on 12 June 2012 when the 
on-site tech increased trigger level on the DG535.
Measurements:sgprlprofmerge1turnC1.c0:
  • solar_offset_nudge_t2
  • electronic_background_t1_analog_high
  • Preliminary cloud base height above ground level(cbh)
  • parameters
  • solar_background_nitrogen_low
  • solar_offset_nudge_t1
  • electronic_background_t2_analog_high
  • Merged count rate for nitrogen counts high(nitrogen_counts_high)
  • shots_summed
  • electronic_background_depolarization_analog_high
  • nitrogen_counts_low_glue_coef_slope
  • solar_background_water_low
  • parameters_water_low
  • solar_offset_nudge_nl
  • water_counts_high_glue_coef_slope
  • t2_counts_high_glue_coef_offset
  • Merged count rate for elastic counts low(elastic_counts_low)
  • solar_offset_nudge_nh
  • solar_offset_nudge_wl
  • electronic_background_elastic_analog_low
  • parameters_t1_high
  • parameters_nitrogen_high
  • t1_counts_high_glue_coef_offset
  • solar_offset_nudge_eh
  • electronic_background_water_analog_high
  • t1_counts_high_glue_coef_slope
  • solar_offset_nudge_el
  • solar_offset_nudge_wh
  • nitrogen_counts_low_glue_coef_offset
  • solar_background_elastic_low
  • Merged count rate for elastic high channel(elastic_counts_high)
  • electronic_background_elastic_analog_high
  • depolarization_counts_high_glue_coef_slope
  • electronic_background_liquid_analog_high
  • parameters_elastic_low
  • parameters_elastic_high
  • parameters_t2_high
  • water_counts_low_glue_coef_offset
  • elastic_counts_high_glue_coef_slope
  • elastic_counts_low_glue_coef_slope
  • electronic_background_nitrogen_analog_low
  • Merged count rate for water counts high(water_counts_high)
  • water_counts_low_glue_coef_slope
  • depolarization_counts_high_glue_coef_offset
  • solar_offset_nudge_dh
  • nitrogen_counts_high_glue_coef_slope
  • liquid_counts_high_glue_coef_slope
  • solar_offset_nudge_lw
  • electronic_background_nitrogen_analog_high
  • parameters_water_high
  • Merged count rate for t1 counts high(t1_counts_high)
  • liquid_counts_high
  • t2_counts_high_glue_coef_slope
  • cloud_value_check
  • Merged count rate(depolarization_counts_high)
  • elastic_counts_high_glue_coef_offset
  • nitrogen_counts_high_glue_coef_offset
  • electronic_background_water_analog_low
  • merge_flags_low
  • n2_cloud_check_value
  • liquid_counts_high_glue_coef_offset
  • water_counts_high_glue_coef_offset
  • parameters_nitrogen_low
  • elastic_counts_low_glue_coef_offset
  • merge_flags_high
  • Merged count rate for water counts low(water_counts_low)
  • parameters_liquid_high
  • parameters_depolarization_high
  • Merged count rate for nitrogen counts low(nitrogen_counts_low)
  • Merged count rate for t2 counts high(t2_counts_high)


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DQRID : D140221.8
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/03/2012000001/28/20140000Does not affect quality
Subject:
SGP/RL/C1 - Reprocessing Notice (RID 1026)
DataStreams:sgprlprofmerge1turnC1.c0
Description:
See below for details of reprocessing that was completed on 20140822.  Original DQR 
category:3 (Yellow, Suspect ).

-----------------------------------------------------------

Regions where photon counting rates exceed 20 MHz are 37.5 meters too high. Correct data 
by shifting down 37.5 meters.


Additional information:
The detection system in the RL uses Licel data recorders. These recorders provide 
simultaneous measurements of analog voltage and photon counts from the photo multiplier tubes. 
The analog signal has an inherent delay relative to the photon counting signal, which is 
corrected for in the rlprofmerge VAP. The delay parameter is determined through offline 
analysis by the instrument mentor, and then inputted into a configuration file that is used 
by the VAP.
During the effected period, the delay parameter for the narrow-field-of-view elastic 
channel was incorrect. As a result, the  analog signal leads the photon counting signal by 5 
range bins (5X7.5m = 37.5m). Photon counting rates that are outputted by the rlprofmerge 
VAP use the analog signals in regions where the photon counting rates exceed 20 MHz. So 
the counting rate data in these regions are (incorrectly) shifted downward by 37.5 m (i.e. 
-37.5m).
Measurements:sgprlprofmerge1turnC1.c0:
  • height_high
  • elastic_counts_high_glue_coef_slope
  • elastic_counts_high_glue_coef_offset
  • Merged count rate for elastic high channel(elastic_counts_high)
  • electronic_background_elastic_analog_high


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DQRID : D140326.7
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/25/2014150003/26/20141220Suspect
Subject:
SGP/RLPROF/C1 - Reduced signal due to partially closed laser shutter
DataStreams:sgprlprofmerge1turnC1.c0
Description:
The laser shutter was partially closed during the period in question. This resulted in a 
reduction in the sensitivity of all detection channels.
Measurements:sgprlprofmerge1turnC1.c0:
  • solar_offset_nudge_t2
  • electronic_background_t1_analog_high
  • Preliminary cloud base height above ground level(cbh)
  • parameters
  • solar_offset_nudge_t1
  • solar_background_nitrogen_low
  • electronic_background_t2_analog_high
  • Merged count rate for nitrogen counts high(nitrogen_counts_high)
  • Humidity, relative, on hybrid-b grid, derived from RUC model(rh)
  • electronic_background_depolarization_analog_high
  • shots_summed
  • nitrogen_counts_low_glue_coef_slope
  • solar_background_water_low
  • parameters_water_low
  • s10
  • solar_offset_nudge_nl
  • height_low
  • water_counts_high_glue_coef_slope
  • t2_counts_high_glue_coef_offset
  • Merged count rate for elastic counts low(elastic_counts_low)
  • solar_offset_nudge_nh
  • s7
  • s8
  • s9
  • solar_offset_nudge_wl
  • electronic_background_elastic_analog_low
  • parameters_t1_high
  • parameters_nitrogen_high
  • s1
  • s2
  • s3
  • s4
  • s5
  • s6
  • electronic_background_water_analog_high
  • t1_counts_high_glue_coef_offset
  • solar_offset_nudge_eh
  • t1_counts_high_glue_coef_slope
  • solar_offset_nudge_el
  • solar_offset_nudge_wh
  • nitrogen_counts_low_glue_coef_offset
  • solar_background_elastic_low
  • Merged count rate for elastic high channel(elastic_counts_high)
  • electronic_background_elastic_analog_high
  • depolarization_counts_high_glue_coef_slope
  • filter
  • electronic_background_liquid_analog_high
  • parameters_elastic_low
  • pulse_energy
  • parameters_t2_high
  • parameters_elastic_high
  • water_counts_low_glue_coef_offset
  • elastic_counts_high_glue_coef_slope
  • elastic_counts_low_glue_coef_slope
  • electronic_background_nitrogen_analog_low
  • Merged count rate for water counts high(water_counts_high)
  • height_high
  • water_counts_low_glue_coef_slope
  • depolarization_counts_high_glue_coef_offset
  • solar_offset_nudge_dh
  • nitrogen_counts_high_glue_coef_slope
  • liquid_counts_high_glue_coef_slope
  • solar_offset_nudge_lw
  • electronic_background_nitrogen_analog_high
  • parameters_water_high
  • Merged count rate for t1 counts high(t1_counts_high)
  • liquid_counts_high
  • t2_counts_high_glue_coef_slope
  • cloud_value_check
  • Merged count rate(depolarization_counts_high)
  • elastic_counts_high_glue_coef_offset
  • nitrogen_counts_high_glue_coef_offset
  • temp1
  • electronic_background_water_analog_low
  • temp3
  • n2_cloud_check_value
  • Model derived 2-meter temperature(temp2)
  • merge_flags_low
  • temp5
  • liquid_counts_high_glue_coef_offset
  • temp4
  • water_counts_high_glue_coef_offset
  • parameters_nitrogen_low
  • temp6
  • elastic_counts_low_glue_coef_offset
  • merge_flags_high
  • parameters_depolarization_high
  • Merged count rate for water counts low(water_counts_low)
  • parameters_liquid_high
  • Merged count rate for nitrogen counts low(nitrogen_counts_low)
  • Merged count rate for t2 counts high(t2_counts_high)
  • laser_head


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DQRID : D140416.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
03/25/2014150003/26/20141215Suspect
Subject:
SGP/RLPROF/C1 - Reduced SNR due to partial laser blockage
DataStreams:sgprlprofmerge1turnC1.c0
Description:
The laser output was partially blocked. This resulted in reduced SNR in all detection 
channels.
Measurements:sgprlprofmerge1turnC1.c0:
  • Merged count rate for nitrogen counts high(nitrogen_counts_high)
  • Merged count rate for t1 counts high(t1_counts_high)
  • liquid_counts_high
  • Merged count rate for water counts high(water_counts_high)
  • Merged count rate(depolarization_counts_high)
  • Merged count rate for nitrogen counts low(nitrogen_counts_low)
  • Merged count rate for water counts low(water_counts_low)
  • Merged count rate for elastic high channel(elastic_counts_high)
  • Merged count rate for t2 counts high(t2_counts_high)
  • Merged count rate for elastic counts low(elastic_counts_low)


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DQRID : D140619.4
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/18/2014191006/19/20142145Incorrect
Subject:
SGP/RLPROF/C1 - Invalid data due to hatch closure
DataStreams:sgprlprofmerge1turnC1.c0
Description:
The outgoing beam was completely blocked by the hatch. As a result, the data contain no 
valid atmospheric signals.
Measurements:sgprlprofmerge1turnC1.c0:
  • solar_offset_nudge_t2
  • electronic_background_t1_analog_high
  • Preliminary cloud base height above ground level(cbh)
  • solar_background_nitrogen_low
  • solar_offset_nudge_t1
  • electronic_background_t2_analog_high
  • Merged count rate for nitrogen counts high(nitrogen_counts_high)
  • electronic_background_depolarization_analog_high
  • nitrogen_counts_low_glue_coef_slope
  • solar_background_water_low
  • solar_offset_nudge_nl
  • water_counts_high_glue_coef_slope
  • t2_counts_high_glue_coef_offset
  • Merged count rate for elastic counts low(elastic_counts_low)
  • solar_offset_nudge_nh
  • solar_offset_nudge_wl
  • electronic_background_elastic_analog_low
  • t1_counts_high_glue_coef_offset
  • solar_offset_nudge_eh
  • electronic_background_water_analog_high
  • t1_counts_high_glue_coef_slope
  • solar_offset_nudge_el
  • solar_offset_nudge_wh
  • nitrogen_counts_low_glue_coef_offset
  • solar_background_elastic_low
  • Merged count rate for elastic high channel(elastic_counts_high)
  • electronic_background_elastic_analog_high
  • depolarization_counts_high_glue_coef_slope
  • electronic_background_liquid_analog_high
  • water_counts_low_glue_coef_offset
  • elastic_counts_high_glue_coef_slope
  • elastic_counts_low_glue_coef_slope
  • electronic_background_nitrogen_analog_low
  • Merged count rate for water counts high(water_counts_high)
  • water_counts_low_glue_coef_slope
  • depolarization_counts_high_glue_coef_offset
  • solar_offset_nudge_dh
  • nitrogen_counts_high_glue_coef_slope
  • liquid_counts_high_glue_coef_slope
  • electronic_background_nitrogen_analog_high
  • solar_offset_nudge_lw
  • Merged count rate for t1 counts high(t1_counts_high)
  • liquid_counts_high
  • t2_counts_high_glue_coef_slope
  • cloud_value_check
  • Merged count rate(depolarization_counts_high)
  • elastic_counts_high_glue_coef_offset
  • nitrogen_counts_high_glue_coef_offset
  • electronic_background_water_analog_low
  • merge_flags_low
  • n2_cloud_check_value
  • liquid_counts_high_glue_coef_offset
  • water_counts_high_glue_coef_offset
  • elastic_counts_low_glue_coef_offset
  • merge_flags_high
  • Merged count rate for water counts low(water_counts_low)
  • Merged count rate for nitrogen counts low(nitrogen_counts_low)
  • Merged count rate for t2 counts high(t2_counts_high)


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