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《Acta Meteorologica Sinica》 2007-04
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DYNAMIC AND MICROPHYSICAL STRUCTURES OF A SQUALL LINE SYSTEM AND EFFECTS OF RAIN DROP SIZE DISTRIBUTION ON PRECIPITATION

Liu Liping Mu Rong Xu Xiaoyong Hu Zhiqun The National Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,100081 Beijing  
Changes of rain drop size distribution and vertical variations of reflectivity are main factors in precipitation estimation with radar.The KOUN dual linear polarization radar data of a squall line case in USA are used to analyze horizontal and vertical variations of ZH,ZDR,KDP,wind field, hydrometeor phase distributions,rain drop size distributions(DSD) and hail melting processes,and their effects on precipitation estimations by five retrieval algorithms.The retrieval algorithms used in this paper include the "beta"(β) method and the "constrained-gamma" method for rain drop size distribution,the fuzzy logical phase distinguish,and the 4DVAR wind retrieval.The results show that the squall line lay in the mid-lower level convergence zone of northwest and southeast winds within a cyclone.There were downdrafts in the stratiform clouds of the rear part of the squall line,and a boundary layer convergence line induced by downdrafts in front of the squall line.The DSDs were different in the strong echo band of convective cells and in the stratiform cloud precipitation area rear of the squall line,and large drops often occurred in the new echo in front of the squall line.Variations of ZH,ZDR with altitude were obvious,but KDP almost did not change with altitude.Correspondingly,the selection of radar data level has larger influence on precipitation values estimated by the Z-R relation and the R(ZH,ZDR) estimator.The DSD distinctively varied in the convective precipitation process,which has important effect on precipitation estimations by the Z-R relation.Precipitations estimations by the R(ZH,ZDR) and R(KDP) methods are similar,but the Z-R relation overestimated the precipitation at convective centers.The KDP method had larger errors of precipitation estimation in cases of weak echo(less than 30 dBz).Therefore,it is necessary to use a "hybrid" approach to estimate precipitation.
【Fund】: 国家科技部科研院所技术开发研究专项资金项目“双线偏振雷达气象产品生成软件系统研制”项目;; 国家重大基础研究项目(2004CB418305)
【CateGory Index】: P406;P426.6
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