DQRID : D030922.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
04/28/2002020008/29/20020100Missing
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Subject:
NSA/MPL/C1 - laser head failure
DataStreams:nsamplC1.a1, nsamplC1.00, nsamplsmask1clothC1.c1, nsamplcmask1clothC1.c1
Description:
On 2002-04-28 the laser energy was observed to decrease throughout the day.  Although low 
clouds continued to be detected, by the end of the day the output laser energy was about 
10% of nomimal.  This decrease continued throughout 2002-04-29 to the extent that clouds 
were no longer detected.  The source of failure was eventually determined to be the laser 
head, requiring the MPL to be shipped for repair.  The MPL was reinstalled on 2002-08-28 
at about 01:00 UTC.  

MPL NSA data from 2002-04-29 through 2002-08-27 (inclusive) should not be used.
Suggestions: 
Use other measures of cloud base such as millimeter cloud radar or Vaisala 

Ceilometer, both of which were operational throughout this period.
Measurements:nsamplcmask1clothC1.c1:
  • CloudMaskMplCloth
  • Heights
  • base_time
  • time_offset
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nsamplsmask1clothC1.c1:
  • base_time
  • time_offset
  • Heights
  • SigniMaskMplCloth
more
nsamplC1.a1:
  • filter_temp
  • base_time
  • pulse_rep
  • laser_sync_offset
  • range
  • instrument_temp
  • voltage_10
  • shots_sum
  • total_counts
  • energy_monitor
  • voltage_15
  • transceiver_azimuth_angle
  • backscatter
  • max_altitude
  • range_offset
  • time
  • range_bin_time
  • lon
  • deadtime_correction
  • range_bin_width
  • time_offset
  • range_bins
  • preliminary_cbh
  • scalar_sync_offset
  • lat
  • property
  • voltage_05
  • shots_summed
  • laser_scalar_sync_offset
  • transceiver_altitude_angle
  • background_signal
  • height
  • laser_temp
  • trigger_freq
  • detector_temp
  • alt
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nsamplC1.00:
  • Raw data stream - documentation not supported
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