DQRID : D150612.9
Start DateStart TimeEnd DateEnd Time Data Quality Metric
02/01/2005010006/19/20052145Incorrect
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Subject:
TWP/MMCR/C3 - Calibration Error - RAW data only
DataStreams:twpmmcrC3.00
Description:
The Solaris computer was changed out in late January 2005.  The antenna parameters were 
not changed when this happened so that the SGP's antenna gain and beam widths were used to 
calculate the radar constant.  This results in an underestimation of 4.69 dB in 
reflectivity.  

The difference in antenna gain is 57.2-52.73 dB or 4.47 dB.  Since the game is squared in 
the denominator of the radar constant, this results in an error of 8.94 dB due to the 
antenna gain alone.  

The difference in beam width is 0.19 to 0.31.  20log(.19/.31) = -4.25 dB.

Total reflectivity error = 8.94 dB - 4.25 dB = 4.69 dB

The raw data could not be edited to make this fix, however the reprocessing team was able 
to apply this correction to the netcdf files per RID 0200, DQR D050620.1, EWO 15549.  If 
this raw data needs to be reprocessed again, please apply these same calibrations to the 
dataset.
Suggestions: 
4.69 should be added to all reflectivity values.
Measurements:twpmmcrC3.00:
  • Raw data stream - documentation not supported
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