Data Quality Reports for Session: 106081 User: gaun Completed: 06/14/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060224.3TWP/MPL/C3 - Temporary laser failuretwpmplC3.00, twpmplC3.a1
D060225.1TWP/MPL/C1 - Energy monitor values are erroneoustwpmplC1.00, twpmplC1.a1
D060227.1TWP/MPL/C3 - Backscatter profiles are inaccurate due to computer HD corruption.twpmplC3.00, twpmplC3.a1
D060324.1TWP/MPL/C1 - Time stamps are incorrect.twpmplC1.00, twpmplC1.a1
D060901.1TWP/MPL/C1 - Data dropoutstwpmplC1.a1, twpmplcmask1clothC1.c1, twpmplsmask1clothC1.c1


DQRID : D060224.3
Start DateStart TimeEnd DateEnd Time
02/20/2006060002/23/20060600
Subject:
TWP/MPL/C3 - Temporary laser failure
DataStreams:twpmplC3.00, twpmplC3.a1
Description:
No backscatter information is in the data. The backscatter data in the files during this 
time is solar background information only. 

The laser turned it's self off, reason: unknown. A power cycle of the entire system 
corrected the problem.
Measurements:twpmplC3.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

twpmplC3.a1:
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Attenuated backscatter(detector_counts)


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DQRID : D060225.1
Start DateStart TimeEnd DateEnd Time
11/11/2005120002/25/20062300
Subject:
TWP/MPL/C1 - Energy monitor values are erroneous
DataStreams:twpmplC1.00, twpmplC1.a1
Description:
Energy monitor values should not be used to normalization the backscatter profiles. A 
problem with the energy monitor electronics forced the value to maximum. The problem was 
corrected.
Measurements:twpmplC1.a1:
  • Energy output per pulse of transmitted laser beam at 532 nm (Doubled Nd -YLF)(energy_monitor)

twpmplC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)


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DQRID : D060227.1
Start DateStart TimeEnd DateEnd Time
02/24/2006060002/27/20060700
Subject:
TWP/MPL/C3 - Backscatter profiles are inaccurate due to computer HD corruption.
DataStreams:twpmplC3.00, twpmplC3.a1
Description:
The data shows a consistent cloud deck at 7.5km with what appears to be a duplication of 
the data from ground zero. The temperature and energy monitor values are also affected. 
The computer was found with multiple corruption problems. These corruptions may have cause 
the ghost data at 7.5km.  A chkdsk was performed which appears to have corrected the 
problem.
Measurements:twpmplC3.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

twpmplC3.a1:
  • Detector temperature(detector_temp)
  • Instrument temperature(instrument_temp)
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Attenuated backscatter(detector_counts)
  • Laser temperature(laser_temp)
  • Background signal(background_signal)
  • Energy output per pulse of transmitted laser beam at 532 nm (Doubled Nd -YLF)(energy_monitor)


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DQRID : D060324.1
Start DateStart TimeEnd DateEnd Time
03/09/2006050003/22/20062100
Subject:
TWP/MPL/C1 - Time stamps are incorrect.
DataStreams:twpmplC1.00, twpmplC1.a1
Description:
The computer was experiencing time synchronization problems. The time stamp for the data 
is incorrect. The synchronization continued to get worse throughout the period.  Secondary 
results of the sync problem are data gaps. The problem exhibited itself with data gaps 
at the end of every hour. As the computer continued to get further out of sync, the 
duration of the data gaps increased.

The error in time synchronization can be corrected by comparing the MPL data with another 
instrument such as the ceilometers or MMCR. The error in time can be determined by 
looking for identical cloud structure. Then shift the MPL data in time to match the other 
instruments. Remember the error is not constant; it continues to get worst throughout the period.
Measurements:twpmplC1.a1:
  • Laser temperature(laser_temp)
  • Voltage level which operates the thermistor(voltage_10)
  • Assumed zero-range bin number\(assumed_zero_range_bin)
  • Number of laser pulses summed during measurement interval(shots_summed)
  • Background signal(background_signal)
  • Instrument temperature(instrument_temp)
  • Filter temperature(filter_temp)
  • Repetition rate, or Trigger Frequency of the laser(pulse_rep)
  • effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
  • Time offset from base_time(base_time)
  • Detector temperature(detector_temp)
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Energy output per pulse of transmitted laser beam at 532 nm (Doubled Nd -YLF)(energy_monitor)
  • Time offset from midnight of date of file. For CO data, this is identical to
    time_offset and is included for compatibility.(time)
  • Voltage level which operates the energy monitor(voltage_15)
  • Attenuated backscatter(detector_counts)
  • Voltage level which operates the A/D card and the detector(voltage_05)
  • Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
  • Time offset of tweaks from base_time(time_offset)

twpmplC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)


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DQRID : D060901.1
Start DateStart TimeEnd DateEnd Time
08/19/2006180008/28/20060041
Subject:
TWP/MPL/C1 - Data dropouts
DataStreams:twpmplC1.a1, twpmplcmask1clothC1.c1, twpmplsmask1clothC1.c1
Description:
Data dropouts occurred during this period. Problem ended when MPL computer was rebooted.
Measurements:twpmplC1.a1:
  • Background signal(background_signal)
  • Angle of orientation with respect to true geographic north(tranceiver_azimuth_angle)
  • distance to center of range bin after correcting for offset in sync(range)
  • Height of bins above ground level for the temperature, retrieved water vapor,
    and pressure profile(height)
  • Detector temperature(detector_temp)
  • altitude above sea levelaltunits(alt)
  • required to correct raw counts for detector deadtime prior to all other
    corrections.(deadtime_correction)
  • Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)
  • GPS raw data filename(filename)
  • east longitude for all the input platforms.(lon)
  • Attenuated backscatter(detector_counts)
  • Maximum altitude retrieved from multichannel scalar card.(max_altitude)
  • Voltage level which operates the thermistor(voltage_10)
  • Average cloud base height used in the retrieval(cbh)
  • Repetition rate, or Trigger Frequency of the laser(pulse_rep)
  • Preliminary cloud base height above ground level(preliminary_cbh)
  • Voltage level which operates the energy monitor(voltage_15)
  • value represents date when configuration is first applicable as YYYYMMDD(property)
  • north latitude for all the input platforms.(lat)
  • Angle of inclination with respect to horizontal(tranceiver_altitude_angle)
  • Number of laser pulses summed during measurement interval(shots_sum)
  • Laser temperature(laser_temp)
  • Aerosol volume backscattering coefficient at 355 nm(backscatter)
  • Filter temperature(filter_temp)
  • Time offset from midnight of date of file. For CO data, this is identical to
    time_offset and is included for compatibility.(time)
  • Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
  • Distance from leading edge of first range bin to the center of each bin .(range_bins)
  • Repetition rate, or Trigger Frequency of the laser(trigger_freq)
  • Time offset of tweaks from base_time(time_offset)
  • Voltage level which operates the A_D card and the detector(voltage_5)
  • Width of range-bins calculated from range_bin_time(range_bin_width)
  • Assumed zero-range bin number\(assumed_zero_range_bin)
  • Number of laser pulses summed during measurement interval(shots_summed)
  • Instrument temperature(instrument_temp)
  • effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
  • Time offset from base_time(base_time)
  • Energy output per pulse of transmitted laser beam at 532 nm (Doubled Nd -YLF)(energy_monitor)
  • Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
  • Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
  • Voltage level which operates the A/D card and the detector(voltage_05)
  • Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)

twpmplsmask1clothC1.c1:
  • Time offset of tweaks from base_time(time_offset)
  • Range Heights (center of radar sample volume)(Heights)
  • MPL Cloth et al. Algorithm Significance Mask(SigniMaskMplCloth)
  • Time offset from base_time(base_time)

twpmplcmask1clothC1.c1:
  • Time offset from base_time(base_time)
  • Time offset of tweaks from base_time(time_offset)
  • Range Heights (center of radar sample volume)(Heights)
  • MPL Clothiaux et al. Algorithm Cloud Mask Occurrence(CloudMaskMplCloth)


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