SGP/MERGESONDE/C1 - Reprocessing Notice (RID 927)

See below for details of reprocessing that was completed on 20140904.  Original DQR 
category: 4 (Red, Incorrect).

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All precip values are incorrectly reported during the period:  

From 20060101-20101231 all precip values are incorrectly reported as missing, or -9999.  

From 20110101-present all precip values are reported as 0 even though the qc_precip 
variable flags the data as missing, or -9999. 

The precipitation data from the co-located surface met station were not actually missing, 
but the MERGESONDE VAP did not properly ingest these data.  While the 0 precip values 
reported after 20110101 in MERGESONDE may be correct on days with no precip, they are not 
actually tied to the measurements from the co-located rain gauge and are due to a VAP 
software error.

To correct this issue, the MERGESONDE software will need to be corrected so the data can 
be reprocessed.  Because precip is a secondary variable in MERGESONDE, this issue is 
considered low priority and the VAP will not be reprocessed until a sufficient number of 
issues in the VAP have been identified.

• Precipitation, total, derived from ETA model(precip)

SGP/KASACR/C1 - Reprocess: Mean Doppler Velocity sign reversed

The signs of the mean_doppler_velocity field values are incorrect.  The ARM convention for 
this field is that positive velocities indicate motion away from the radar.  However, 
the velocity data in these files have their signs reversed, so that motion TOWARD the radar 
has a positive sign.

• Mean Doppler Velocity(mean_doppler_velocity)

• Mean Doppler Velocity(mean_doppler_velocity)

• Mean Doppler Velocity(mean_doppler_velocity)

• Mean Doppler Velocity(mean_doppler_velocity)

SGP/WSACR/C1 - Reprocess: Mean Doppler Velocity sign reversed

The signs of the mean_doppler_velocity field values are incorrect.  The ARM convention for 
this field is that positive velocities indicate motion away from the radar.  However, 
the velocity data in these files have their signs reversed, so that motion TOWARD the radar 
has a positive sign.

• Mean Doppler Velocity(mean_doppler_velocity)

SGP/KAZR/C1 - Background shifts

The cross-pol/co-pol plot showed a pulse type issue, as if radar was switching modes, or 
there were intermittent voltage differences.  It is believed that the issue was due to the 
TWTA waveguide pressurization system.  However, the issue self-rectified before a cause 
could be definitively identified.

• Mean doppler velocity, cross-polar, dealiased(mean_doppler_velocity_xpol)
• signal_to_noise_ratio_xpol
• Reflectivity, cross-polarization(reflectivity_xpol)
• Spectral width, cross-polar(spectral_width_xpol)
• cal_constant_xpol

• cal_constant_xpol
• Reflectivity, cross-polarization(reflectivity_xpol)
• Mean doppler velocity, cross-polar, dealiased(mean_doppler_velocity_xpol)
• Spectral width, cross-polar(spectral_width_xpol)
• signal_to_noise_ratio_xpol

SGP/KASACR/C1 - Range Dimension Changes

The length and minimum value of range are not stable and change at times.

• range

SGP/KAZR/C1 - Reprocessing Notice (RID 1117)

See below for details of reprocessing that was completed on 20150626.  Original 
DQR category: 4 (Red, Incorrect).

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The wrong calibrations were used due to a problem with the software. Mentor discovered the 
reflectivity between long and short pulse did not agree with each other after analyzing 
data. Data will be reprocessed.

• Reflectivity, co-polarization(reflectivity_copol)
• Reflectivity, cross-polarization(reflectivity_xpol)

• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)

SGP/WSACR/C1 - Instrument Down

DQR marks periods of missing data based on the  DQ Office metrics and files at the 
Archive.

• altitude_agl
• time
• unambiguous_range
• base_time
• r_calib_receiver_gain_vx
• sweep_start_ray_index
• fixed_angle
• Linear depolarization ratio(linear_depolarization_ratio)
• r_calib_noise_source_power_v
• r_calib_two_way_radome_loss_h
• r_calib_noise_source_power_h
• sweep_end_ray_index
• range
• time_coverage_start
• altitude
• latitude
• r_calib_index
• longitude
• radar_beam_width_h
• r_calib_pulse_width
• prt_mode
• r_calib_radar_constant_h
• volume_number
• sweep_number
• sweep_mode
• radar_antenna_gain_h
• East longitude(lon)
• elevation
• r_calib_noise_vx
• nyquist_velocity
• antenna_transition
• radar_measured_transmit_power_h
• r_calib_radar_constant_v
• r_calib_xmit_power_h
• platform_type
• primary_axis
• radar_antenna_gain_v
• polarization_mode
• r_calib_receiver_gain_hc
• instrument_type
• pulse_width
• time_coverage_end
• Mean Doppler Velocity(mean_doppler_velocity)
• scan_rate
• r_calib_time
• Signal to noise ratio(snr)
• frequency
• r_calib_noise_hc
• Altitude above mean sea level(alt)
• Reflectivity(reflectivity)
• prt
• n_samples
• azimuth
• radar_beam_width_v
• North latitude(lat)
• follow_mode
• Spectral Width(spectral_width)

SGP/DL/DLPROF/C1 - Instrumental artifact in vertical velocity variance profiles

Long-term averages of vertical velocity variance profiles developed from vertical staring 
data show a height-dependent sinusoidal modulation superimposed on the atmospheric 
variance profile. This modulation causes a wiggle in the variance profile. The period of the 
wiggle is about 350 m, and the effect is most obvious during hot afternoon periods in the 
summer months. The exact cause of this problem is not known, but we suspect that it may be 
caused by temperature sensitivity in beam alignment.

• Radial velocity(radial_velocity)

• Noise corrected vertical velocity variance(w_variance)