用相关法估测CAPPI等高面上的TREC风  

Estimating TREC Wind on CAPPI by Echo Correlation Method

作　　者：严红梅[1] 顾松山[1] 胡胜[2] 夏文梅[3] 杨凡[1] 

机构地区：[1]南京信息工程大学遥感学院 [2]广州中心气象台,广东广州510080 [3]江苏省气象局气象科学研究所,江苏南京210008

出　　处：《南京气象学院学报》2008年第3期436-440,共5页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40475017)

摘　　要：使用雷达资料,运用相关法估测CAPPI(constant altitude plan position indicating,等高平面位置显示)上的TREC(tracking radar echoes by correlation)风,根据雷达在两个观测时间的数据,估算CAPPI上的水平流场,从而外推整个回波场的运动走向。经输入台风、暴雨、晴空边界层的回波个例试验,结果表明有助于短时天气预报。在TREC应用于晴空回波时,根据当地实际情况,通过适当改动相关系数的阈值可以消除杂波产生的对TREC矢量的干扰。The TREC （tracking radar echoes by correlation） method is used to estimate the TREC wind on CAPPI （constant altitude plan position indicating）. The horizontal storm streamline field on CAPPI is first estimated from single radar observation data at two successive observation times, and then the motion direction of the whole echo field is extrapolated. The case experiments of typhoon, rainstorm, and boundary clear air echoes are performed, and the results suggest that the horizontal structure of the meso-scale systems is better revealed, thus favorable to the nowcasting of meso-scale systems. Besides, in the boundary clear air echo experiment, the interference of large ground targets with TREC vectors can be controlled by adjusting the correlation coefficient threshold.

关 键 词：水平流场 相关法 CAPPI 

分 类 号：P412.16[天文地球—大气科学及气象学]