Data Quality Reports for Session: 100072 User: whwang Completed: 06/13/2006


DQR IDSubjectData Streams Affected
D030922.3NSA/MPL/C1 - laser head failurensamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplsmask1clothC1.c1

DQRID : D030922.3
Start DateStart TimeEnd DateEnd Time
NSA/MPL/C1 - laser head failure
DataStreams:nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplsmask1clothC1.c1
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.
  • MPL Cloth et al. Algorithm Significance Mask(SigniMaskMplCloth)
  • Range Heights (center of radar sample volume)(Heights)
  • Time offset from base_time(base_time)
  • Time offset of tweaks from base_time(time_offset)

  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

  • Range Heights (center of radar sample volume)(Heights)
  • MPL Clothiaux et al. Algorithm Cloud Mask Occurrence(CloudMaskMplCloth)
  • Time offset of tweaks from base_time(time_offset)
  • Time offset from base_time(base_time)

  • Angle of orientation with respect to true geographic north(transceiver_azimuth_angle)
  • Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)
  • Number of laser pulses summed during measurement interval(shots_summed)
  • Time offset from base_time(base_time)
  • Background signal(background_signal)
  • Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
  • Aerosol volume backscattering coefficient at 355 nm(backscatter)
  • required to correct raw counts for detector deadtime prior to all other
  • Maximum altitude retrieved from multichannel scalar card.(max_altitude)
  • Laser temperature(laser_temp)
  • Number of laser pulses summed during measurement interval(shots_sum)
  • Distance from leading edge of first range bin to the center of each bin.(range_bins)
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Voltage level which operates the A/D card and the detector(voltage_05)
  • value represents date when configuration is first applicable as YYYYMMDD(property)
  • Height of bins above ground level for the temperature, retrieved water vapor,
    and pressure profile(height)
  • Time offset from midnight forecast initialization time(time)
  • north latitude for all the input platforms.(lat)
  • Repetition rate, or Trigger Frequency of the laser(trigger_freq)
  • Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
  • Time offset of tweaks from base_time(time_offset)
  • effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
  • Detector temperature(detector_temp)
  • altitude above sea levelaltunits(alt)
  • Voltage level which operates the energy monitor(voltage_15)
  • Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
  • Voltage level which operates the thermistor(voltage_10)
  • Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
  • Filter temperature(filter_temp)
  • Instrument temperature(instrument_temp)
  • Width of range-bins calculated from range_bin_time(range_bin_width)
  • Repetition rate, or Trigger Frequency of the laser(pulse_rep)
  • east longitude for all the input platforms.(lon)
  • Energy output per pulse of transmitted laser beam at 523 nm (Doubled Nd-YLF)(energy_monitor)
  • Angle of inclination with respect to horizontal(transceiver_altitude_angle)
  • distance to center of range bin after correcting for offset in sync(range)

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