TWP/MPL/C2 - Power Oscillation

There is an oscillation that shows up in the reflected power and the power monitor.  This 
oscillation shows up clearly whenever there is an absence of low (< ~5 km) clouds. Cloud 
return signals tend to be much larger than the level of this oscillation; however, it may 
introduce problems for studying aerosol distributions.  The end date of this DQR is 
artificial in that this is as far as the QC went.

• Aerosol backscatter coefficient at 355 nm(backscatter)
• Laser output energy per pulse(energy_monitor)

TWP/C2/MPL Detector

The MPL detector failed and was shut down.

• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• MPL Cloth et al. Algorithm Significance Mask(SigniMaskMplCloth)
• Height of Center of Each Range Bin(Heights)

• null(Raw data stream - documentation not supported)

• Instrument Temperature(instrument_temp)
• Laser Temperature(laser_temp)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Cloud base height, measured by MPL(cloud_base_height)
• base time(base_time)
• Flag indicating whether the beam was extinguished at indicated cloud top(cloud_top_attenuation_flag)
• Relative random error in backscatter profiles(random_error)
• Detector Temperature(detector_temp)
• lon(lon)
• Cloud mask(cloud_mask_1)
• Array of heights for the range gates(height)
• lat(lat)
• Background Signal(background_signal)
• Cloud mask(cloud_mask_2)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Dummy altitude for Zeb(alt)
• Laser output energy per pulse(energy_monitor)
• Time offset of tweaks from base_time(time_offset)
• Number of laser shots recorded(shots_summed)
• The update time of the historical baseline used for the cloud boundary
  determination of this sample(baseline_update_time)
• cloud top height(cloud_top_height)

• time(time)
• Repetition rate, or Trigger Frequency of the laser(trigger_freq)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Angle of inclination with respect to horizontal(transceiver_altitude_angle)
• Laser output energy per pulse(energy_monitor)
• Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
• Voltage level which operates the thermistor(voltage_10)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• required to correct raw counts for detector deadtime prior to all other
  corrections.(deadtime_correction)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Number of laser pulses summed during measurement interval(shots_sum)
• Preliminary cloud base height(preliminary_cbh)
• Detector Temperature(detector_temp)
• Instrument Temperature(instrument_temp)
• Filter Temperature(filter_temp)
• Laser Temperature(laser_temp)
• Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• Background Signal(background_signal)
• Number of laser shots recorded(shots_summed)
• Angle of orientation with respect to true geographic north(transceiver_azimuth_angle)
• Voltage level which operates the A/D card and the detector(voltage_05)
• Time offset of tweaks from base_time(time_offset)
• lon(lon)
• base time(base_time)
• lat(lat)
• Dummy altitude for Zeb(alt)
• Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
• Array of heights for the range gates(height)
• range(range)
• Voltage level which operates the energy monitor(voltage_15)
• 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)
• value represents date of last configuration change as yyyymmdd(property)
• Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)

• MPL Cloth et al. Algorithm Cloud Mask(CloudMaskMplCloth)
• Height of Center of Each Range Bin(Heights)
• base time(base_time)
• Time offset of tweaks from base_time(time_offset)

SGP/MPL/C1 - Metadata errors

The latitude, longitude and altitude of the Micropulse Lidar
(MPL) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 MPL is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m

• lat(lat)
• lon(lon)
• Dummy altitude for Zeb(alt)

• lat(lat)
• Dummy altitude for Zeb(alt)
• lon(lon)

TWP/MPL/C2 - Reprocess: Global metadata error

During the time period specified, the global metadata attribute "averaging_int" is 
reported as 30 seconds when the value for this attribute should be 60 seconds.

• Time offset of tweaks from base_time(time_offset)

TWP/MPL/C2 - Reprocess: Incorrect longitude and altitude reported

The longitude of the MPL instrument is reported as -166.916.  The correct longitude is 
+166.916.

The altitude of the MPL instrument is reported as 7.2.  The correct altitude is 7.1 M.

These data will be reprocessed at a low priority.

• Dummy altitude for Zeb(alt)
• lon(lon)

Continuing signal degradation

Despite recent efforts (970310-970314) by the instrument mentor, signal 
degradation of the MPL has continued.  The degradation has continued to the 
point that the effective range of the MPL is nearing 10 km.  The instrument mentor and PI 
have 
concluded that an overhaul of the instrument by the vendor is in order.

• base time(base_time)
• Laser Temperature(laser_temp)
• Preliminary cloud base height(preliminary_cbh)
• Time offset of tweaks from base_time(time_offset)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Angle of inclination with respect to horizontal(transceiver_altitude_angle)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• Detector Temperature(detector_temp)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• Repetition rate, or Trigger Frequency of the laser(trigger_freq)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Angle of orientation with respect to true geographic north(transceiver_azimuth_angle)
• Laser output energy per pulse(energy_monitor)
• lat(lat)
• Instrument Temperature(instrument_temp)
• Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• Dummy altitude for Zeb(alt)
• range(range)
• time(time)
• Number of laser shots recorded(shots_summed)
• value represents date of last configuration change as yyyymmdd(property)
• required to correct raw counts for detector deadtime prior to all other
  corrections.(deadtime_correction)
• Background Signal(background_signal)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)
• Voltage level which operates the thermistor(voltage_10)
• Voltage level which operates the energy monitor(voltage_15)
• Array of heights for the range gates(height)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
• Filter Temperature(filter_temp)
• Number of laser pulses summed during measurement interval(shots_sum)
• Voltage level which operates the A/D card and the detector(voltage_05)
• Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
• lon(lon)

• (Development raw data stream - documentation not supported)

• lat(lat)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Preliminary cloud base height above ground level(cbh)
• lon(lon)

SGP/MPL - Missing data due to blown detector

Sometime early 11/11 the detector on the
MPL-004 blew out.  The Detector was replaced by Albert Mendoza.
The instrument was operational on Jan. 23, 1999.

Link this to P981119.2 that reported the blown detector and the
corrective action taken

• base time(base_time)
• Preliminary cloud base height(preliminary_cbh)
• Time offset of tweaks from base_time(time_offset)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Detector Temperature(detector_temp)
• Repetition rate, or Trigger Frequency of the laser(trigger_freq)
• lat(lat)
• range(range)
• Number of laser shots recorded(shots_summed)
• value represents date of last configuration change as yyyymmdd(property)
• Background Signal(background_signal)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)
• Voltage level which operates the thermistor(voltage_10)
• Array of heights for the range gates(height)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• Number of laser pulses summed during measurement interval(shots_sum)
• Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
• Laser Temperature(laser_temp)
• Angle of inclination with respect to horizontal(transceiver_altitude_angle)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Angle of orientation with respect to true geographic north(transceiver_azimuth_angle)
• Laser output energy per pulse(energy_monitor)
• Instrument Temperature(instrument_temp)
• Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
• Dummy altitude for Zeb(alt)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• time(time)
• required to correct raw counts for detector deadtime prior to all other
  corrections.(deadtime_correction)
• Voltage level which operates the energy monitor(voltage_15)
• Filter Temperature(filter_temp)
• Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
• Voltage level which operates the A/D card and the detector(voltage_05)
• lon(lon)

• (Development raw data stream - documentation not supported)

• Time offset of tweaks from base_time(time_offset)
• lon(lon)
• lat(lat)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Preliminary cloud base height above ground level(cbh)

• Background Signal(background_signal)
• Instrument Temperature(instrument_temp)
• Time offset of tweaks from base_time(time_offset)
• Cloud base height, measured by MPL(cloud_base_height)
• Laser output energy per pulse(energy_monitor)
• lat(lat)
• Cloud mask(cloud_mask_2)
• Array of heights for the range gates(height)
• Number of laser shots recorded(shots_summed)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• The update time of the historical baseline used for the cloud boundary
  determination of this sample(baseline_update_time)
• cloud top height(cloud_top_height)
• Aerosol backscatter coefficient at 355 nm(backscatter)
• Flag indicating whether the beam was extinguished at indicated cloud top(cloud_top_attenuation_flag)
• Detector Temperature(detector_temp)
• Laser Temperature(laser_temp)
• Cloud mask(cloud_mask_1)
• lon(lon)
• base time(base_time)
• Relative random error in backscatter profiles(random_error)
• Dummy altitude for Zeb(alt)