Approaches to radar reflectivity bias correction to improve rainfall estimation in Korea

Three methods for determining the reflectivity bias of single polarization radar using dual polarization radar reflectivity and disdrometer data (i.e., the equidistance line, overlapping area, and disdrometer methods) are proposed and evaluated for two low-pressure rainfall events that occurred over...

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Bibliographic Details
Published in:Atmospheric measurement techniques 2016-05, Vol.9 (5), p.2043-2053
Main Authors: You, Cheol-Hwan, Kang, Mi-Young, Lee, Dong-In, Lee, Jung-Tae
Format: Article
Language:English
Subjects:
Bias
Calibration
Drop size
Dual polarization radar
Forecasting
Low pressure
Methods
Polarization
Precipitation
Radar
Radar data
Radar reflectivity
Rain
Rainfall
Rainfall estimation
Reflectance
Time series
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Summary:Three methods for determining the reflectivity bias of single polarization radar using dual polarization radar reflectivity and disdrometer data (i.e., the equidistance line, overlapping area, and disdrometer methods) are proposed and evaluated for two low-pressure rainfall events that occurred over the Korean Peninsula on 25 August 2014 and 8 September 2012. Single polarization radar reflectivity was underestimated by more than 12 and 7 dB in the two rain events, respectively. All methods improved the accuracy of rainfall estimation, except for one case where drop size distributions were not observed, as the precipitation system did not pass through the disdrometer location. The use of these bias correction methods reduced the RMSE by as much as 50 %. Overall, the most accurate rainfall estimates were obtained using the overlapping area method to correct radar reflectivity.
ISSN:1867-8548
1867-1381
1867-8548
DOI:10.5194/amt-9-2043-2016