Atsuko ITADO
A Preliminary Work on New Correction Scheme in Radar Observation Compared with an Operational Scheme
Toshiro KUMAKURA
Radar precipitation is less observed than ground observed precipitation at mountain sites in winter due to the composite processes and observation errors of radar observation.
This study compares the radar precipitation with surface precipitation amount and analyzes the misestimation according to the horizontal distribution of microwave attenuation and the composite processes.
We use the radar precipitation is radar reflectivity data represented in polar coordinates and composite weather radar data in January 2010-2012, when the ground observations are performed by NIED and JMA.
Using the radar reflectivity data represented in the polar coordinates, the relationship between microwave transmission and Zradar/Zobs tends to be excessively corrected, and the trend is clearer than the trend with composite weather radar because it does not include complex error factors due to the composite processes.
We find it has a feature that gradients and y-intercepts in the transmission-Zradar/Zobs figures are similar in the same elevation angle of the radar observation.
By correcting the radar reflectivity data with the approximate curve obtained in each figure, mean of the data becomes zero and the width of the frequency distribution of the Zradar/Zobs can be reduced.
In addition, ground observation data classified for precipitation values made the results better because the trend varies depending on rainfall intensity.
Please use "previous botton" to return the previous page