HFE/MPL/M1 - Frosting/Condensation

On various days during the China deployment, condensation accumulated on the view port 
window of the MPL and compromised its capability to detect clouds.  This problem most often 
occurred during nighttime hours from May through early September.  

During the listed times, cloud retrievals and aerosol profiles should be considered 
doubtful or in error.

The dates/times of occurrence are:
16:00-23:59 GMT on 05/18
17:00-22:00 GMT on 05/23
20:00-22:00 GMT on 05/25
15:00-23:59 GMT on 06/07
17:00-23:59 GMT on 06/08
15:00-23:00 GMT on 06/09
14:00-18:00 GMT on 06/18
18:00-21:00 GMT on 06/21
14:00-16:00 GMT on 06/23
16:00-21:00 GMT on 06/27
17:00-20:00 GMT on 06/28
      22:00 GMT on 06/29
19:00-23:00 GMT on 06/30
13:30-22:30 GMT on 07/02
16:00-17:30 GMT on 07/03 
20:30-22:00 GMT on 07/03
21:30-22:30 GMT on 07/05
13:00-22:00 GMT on 07/06
17:00-18:00 GMT on 07/07
21:00-22:30 GMT on 07/07
16:00-23:59 GMT on 07/10
11:00-23:00 GMT on 07/11
18:00-23:00 GMT on 07/12
15:00-16:00 GMT on 07/13
18:00-23:59 GMT on 07/14
18:00-21:00 GMT on 07/15
17:30-23:00 GMT on 07/16
17:00-23:00 GMT on 07/17
13:00-23:30 GMT on 07/20
18:00-23:00 GMT on 07/24
21:00-23:00 GMT on 07/25
21:00-22:30 GMT on 07/27
12:00-23:59 GMT on 08/02
16:00-21:30 GMT on 08/03
16:00-23:00 GMT on 08/04
14:00-22:30 GMT on 08/05
19:00-23:00 GMT on 08/07
19:00-21:30 GMT on 08/08
15:00-23:30 GMT on 08/10
17:30-23:30 GMT on 08/12
14:00-15:00 GMT on 08/14
16:30-22:30 GMT on 08/14
21:30-22:30 GMT on 08/17
12:00-23:59 GMT on 08/18
12:00-13:30 GMT on 08/19
20:00-23:30 GMT on 08/19
15:00-23:59 GMT on 08/20
11:00-23:59 GMT on 08/22
11:00-23:30 GMT on 08/23
12:00-23:30 GMT on 08/25
13:00-23:30 GMT on 08/26
16:30-23:59 GMT on 08/27
17:00-23:00 GMT on 08/31
15:00-23:59 GMT on 09/01
15:00-20:00 GMT on 09/02
19:30-23:59 GMT on 09/05
16:30-22:30 GMT on 09/09
19:30-23:59 GMT on 09/12
20:30-23:59 GMT on 09/15
14:00-16:30 GMT on 09/16
19:00-23:59 GMT on 09/16
20:30-23:59 GMT on 10/29
22:00-23:59 GMT on 11/01
20:00-23:59 GMT on 11/23
00:00-02:00 GMT on 11/24

• range
• background_signal_std_cross_pol
• Attenuated backscatter, copol(signal_return_co_pol)
• Attenuated backscatter, cross pol(signal_return_cross_pol)
• range_offset
• range_bins
• energy_monitor
• aqc_signal_return_co_pol
• aqc_signal_return_cross_pol
• base_time
• background_signal_co_pol
• polarization_control_voltage_co_pol
• shots_per_sample
• lat
• max_altitude
• dead_time_corrected
• background_signal_cross_pol
• num_bins
• Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
• range_bin_width
• laser_temp
• nsamples_cross_pol_average
• scope_temp
• polarization_control_voltage_cross_pol
• detector_temp
• Pressure, associated geometric height, at altitude, NGM model output(height)
• time_offset
• nsamples_co_pol_average
• background_signal_std_co_pol
• lon
• time
• alt
• Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
• num_channels
• pulse_rep

• shots_per_sample
• num_channels
• dead_time_corrected
• range
• range_bin_width
• Attenuated backscatter, cross pol(signal_return_cross_pol)
• polarization_control_voltage_cross_pol
• detector_temp
• alt
• background_signal_cross_pol
• background_signal_std_co_pol
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
• lon
• aqc_signal_return_co_pol
• max_altitude
• lat
• polarization_control_voltage_co_pol
• scope_temp
• time_offset
• background_signal_std_cross_pol
• pulse_rep
• background_signal_co_pol
• aqc_signal_return_cross_pol
• nsamples_co_pol_average
• num_bins
• Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
• nsamples_cross_pol_average
• range_bins
• energy_monitor
• time
• base_time
• Attenuated backscatter, copol(signal_return_co_pol)
• laser_temp
• range_offset

• range
• num_channels
• polarization_control
• num_bins
• scope_temp
• lon
• detector_temp
• shots_per_avg
• polarization_control_voltage
• alt
• pulse_rep
• Pressure, associated geometric height, at altitude, NGM model output(height)
• background_signal_std
• lat
• base_time
• energy_monitor
• range_bins
• max_altitude
• laser_temp
• Preliminary cloud base height(preliminary_cbh)
• signal_return
• range_bin_width
• time
• time_offset
• range_offset
• background_signal
• range_bin_time
• dead_time_corrected

HFE/WACR/M1 - Reprocessed: Reflectivity and Height Offsets

The instrument vendor informed us of a range (height) offset of 13 m and provided updated 
reflectivity calibration.  All values reported for 'Reflectivity' were approximately 3 dB 
too low.   In addition, the Reflectivity in the first and fourth range gates (starting 
from the surface) needed to be further corrected by an additional 2.7 and -0.9 dB, 
respectively. The 'height' field values were 13.33 m too low.  The data were reprocessed to 
correct these problems.

The hfewacrM1.b1 data were reprocessed and archived in October 2010.  The
hfewacrspeccmaskcopolM1.a0 and hfewacrspeccmaskxpolM1.a0 data were reprocessed and
archived in January and July 2012.

• heights
• Cloud, reflectivity, at altitude(Reflectivity)

• heights
• Cloud, reflectivity, at altitude(Reflectivity)

• heights
• Cloud, reflectivity, at altitude(Reflectivity)

HFE/WACR/M1 - WACR antenna diameter incorrect

The global attribute 'antenna_diameter' has an incorrect value.  The correct antenna 
diameter is 48" or 1.22 m.

• base_time

• base_time