热带气象学报2018，Vol.34Issue(1)：59-67,9.DOI:10.16032/j.issn.1004-4965.2018.01.006
广州S波段双偏振雷达数据质量初步分析
PRELIMINARY ANALYSIS OF DATA QUALITY OF GUANGZHOU S-BANDPOLARIMETRIC WEATHER RADAR
摘要
Abstract
At present,there are five S-band polarimetric weather radars operating in Guangdong province.Due to the technical limitation of the current polarimetric weather radars,the raw polarimetric variables are still unstable,andthe data availability and the main influencing factors must be analyzed in order to ensure the reliability of radar products.Based on the continuous observation data of the dual polarization radar in Guangzhoufrom July to August in 2016,the effects of signal-to-noise ratios (SNR) on cross-correlation coefficients at zero lag (ρHV (0)) and differential reflectivity (ZDR) were analyzed.The result shows that only when SNR reaches 20.0 dB or above,the radar data is credible,and the SNR threshold value of the data can be decreased to 17.0 dB after noise correction.The relation between reflectivity (ZH) and ZDR after noise correction was also analyzed and compared with the fitting results of the raindrops spectrum and the simulated data.The result shows that the measured value of ZDR of a polarimetricradar in Guangzhou is less than both of the fitting results and the simulated data.After the micro-raindrop method index was adjustedaccording to the climatic characteristics of Guangdong,the system bias of ZDR,initial differential phase(φDP(0)) with the different azimuth and time were further analyzed.It is found that ZDR fluctuates between -0.29 dB and-0.22 dB with the azimuth,the average deviation is-0.09 dB after excluding theblockage;and φDP(0) fluctuates about 4 ° with the azimuth,and the system biases of ZDR,φDP(0) fluctuatewith time obviously.In the end,the ZDR was corrected in terms of noise and system biases,and the result shows the quality of ZDR has been improved.These preliminary results are useful for polarization radar data applications.关键词
数据质量/系统偏差特征/微雨滴法/S波段双偏振雷达/差分反射率因子/信噪比Key words
quality of data/characteristics of system bias/micro-raindrop method/S-Band Polarimetric Radar/ZDR/SNR分类
天文与地球科学引用本文复制引用
陈超,胡志群,胡胜,张扬..广州S波段双偏振雷达数据质量初步分析[J].热带气象学报,2018,34(1):59-67,9.基金项目
中国气象局预报员专项(CMAYBY2015-053) （CMAYBY2015-053）
国家科技支撑计划课题(2015BAK11B01) （2015BAK11B01）
国家自然科学基金(41375038) （41375038）
公益性行业专项(GYHY201506006 、GYHY201406009) （GYHY201506006 、GYHY201406009）
广东省科技计划项目(2015A020217008) （2015A020217008）
广东省科技计划项目(2013B020200012) （2013B020200012）
广东省气象局科学技术研究项目(2015B09)共同资助 （2015B09）
