Application of X-Band Dual Polarization Radar in Precipitation Estimation in Summer of Beijing
X波段双极化雷达在北京夏季降水估测中的应用

Dual polarization X-band radar data and ground-based automatic rain gauge data were analyzed for precipitation estimation in summer of Beijing in 2009. Firstly, the low pass filtering and attenuation correction methods were used for controlling the quality of radar data. Then two relationships of X-band radar parameters and rain rate were established, i.e.Zh=159R1.37 and R =13.9Kdp 0.81, after the specific differential propagation phase (Kdp) was extracted. Finally the comparison analysis was made between the rain rates estimated from the two relationships and the corresponding ground data. The results indicate that the rain rates estimated from the two relationships have a good consistency with the ground data. In addition, when the rain rates are greater than 10 mm·h-1, the estimated rain rates from Kdp-R are more accurate and stable than that from Zh-R. Also, the average standard deviation analysis shows that the estimation accuracy of Kdp-R is significantly higher than Zh-R.