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)

• 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/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

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)

SGP/KASACR/C1 - Reprocess: Intermittent missing spectra data

During this period there are times when the spectra ingest and cloud masking processing 
failed, due to problems in matching raw spectra files with the appropriate raw moments 
file. It is believed that many of these remaining raw spectra files can be properly ingested 
when reprocessing is done, although there are cases where no valid moments data exist.

• time_offset
• Spectral Width(spectral_width)
• North latitude(lat)
• Spectrum of raw counts from spectrometer(spectra)
• velocity_bins
• base_time
• Altitude above mean sea level(alt)
• signal_to_noise_ratio
• Mean Doppler Velocity(mean_doppler_velocity)
• azimuth
• elevation
• time
• Reflectivity(reflectivity)
• East longitude(lon)
• range
• locator_mask

• signal_to_noise_ratio
• Mean Doppler Velocity(mean_doppler_velocity)
• elevation
• velocity_bins
• range
• Spectrum of raw counts from spectrometer(spectra)
• North latitude(lat)
• locator_mask
• time_offset
• East longitude(lon)
• base_time
• Spectral Width(spectral_width)
• azimuth
• time
• Altitude above mean sea level(alt)
• Reflectivity(reflectivity)

SGP/MERGESONDE/C1 - Inconsistencies at day boundaries.

Please be aware that there are often inconsistencies at the boundaries between UTC days. 
The severity is dependent on the data variable and the number of sonde launches per day. 
Relative humidity, dew point, wind speed and wind direction are most affected. 

The contribution from sonde data is highest near the sonde times, then decreasing 
strongly. (Example of sonde 
contribution to value at 1 km height: )

Relative humidity at NSA can have large discontinuities at the UTC date boundaries due to 
only having two sonde launches per day. When weather or instrument malfunction reduce the 
number of launches the discontinuity can increase. (Example  at SGP at 1 km and Example at NSA at 1km )

Wind speed Example  at 1 km 
height: 

Temperature values are not affected as severely as other variables (Example  at NSA and Example at SGP 1 km height.)

• Temperature, air, 60-m height, 30-min intervals(temp)
• Wind speed, S-to-N component, at altitude, derived from ETA model(v_wind)
• sonde_fraction
• Wind direction, at 10-m height, 30-min intervals(wdir)
• Wind speed, surface, 1-min avg(wspd)
• Precipitation, total, derived from ETA model(precip)
• Barometric Pressure(bar_pres)
• Temperature, dewpoint, at altitude(dp)
• vapor_source
• Pressure, vapor, at 2-m height, 30-min intervals(vap_pres)
• rh_scaled
• potential_temp
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Wind speed, W-to-E component, at altitude(u_wind)
• sonde_fraction_rh
• Humidity, relative, on hybrid-b grid, derived from RUC model(rh)
• sh