X波段双线性偏振雷达电磁波衰减对冰雹识别的影响  

The Impact of Attenuation of X-Band Dual Linear Polarimetric Radar on Hail Recognition

作　　者：马建立[1] 苏德斌[2] 金永利[1] 李睿劼[1] 

机构地区：[1]北京市人工影响天气办公室,北京100089 [2]北京市气象局,北京100089

出　　处：《高原气象》2012年第3期825-835,共11页Plateau Meteorology

基　　金：国家自然科学基金项目(41075023;40975013)资助

摘　　要：利用X波段双线性偏振雷达2009年4-10月降雨的ZH-ZDR统计分布,得到基于ZH-ZDR分布的冰雹识别参量(HDR)表达式。雷达发射的电磁波经过雨区导致的衰减会使HDR识别冰雹不准确,需要进行衰减订正。文中利用差分相移(DP)订正了HDR表达式中经过雨区衰减的反射率(ZH)和差分反射率(ZDR)。个例分析表明,经雨区衰减订正后X波段双线性偏振雷达回波与北京南郊观象台CIN-RAD/SA多普勒天气雷达回波具有较高的一致性,在零度层之下,HDR>0的区域能有效地反映出地面降雹情况;在零度层之上,HDR>0的区域可能是冰雹或湿霰,订正后HDR判别冰雹的虚警率有可能提高。The hail identification parameter＇ S（HDR） formula expression of X-band dual linear polarime- tric radar is derived from statistical distribution between ZH and ZDR rainfall data from April to October 2009. The caused attenuation of radar transmitting wave passing rain area will lead HDR to identify hail in- accurately, so it is need to correct radar data. The differential phase shift （ФDP） is used to correct the re- flectivity （ZH） and differential reflectivity （ZDR）. The case analysis shows that the reflectivity of X-band dual linear polarimetric radar has a high consistency with the reflectivity of Beijing Nanjiao CINRAD/SA doppler weather radar after correction. Below the zero-temperature level, the region of HDR〉0 can effec- tively reflect the ground hail shooting, and above the zero-temperature level, the region of HD〉0 may be wet graupel or hail, and HDR after correction may increase the false alarm rate.

关 键 词：X波段双线性偏振雷达 冰雹识别 衰减订正 

分 类 号：P406[天文地球—大气科学及气象学]