GPS遥感的大气可降水量与局地降水关系的初步分析

RELATIONSHIP BETWEEN GPS PRECIPITABLE WATER VAPOR AND PRECIPITATION

摘要: 该文利用2002年“973”项目安徽GPS外场试验和2000年北京GPS/VAPOR试验积累的资料对GPS遥感的大气可降水量与局地降水之间关系进行了定量分析。结果表明:在降水前后, GPS遥感的大气可降水量有很大的变化; 在2002年入梅前后, 其变化甚至大于30mm; 在海拔高的山区台站, 2hGPS遥感的大气可降水量增量和本站是否发生降水关系密切; 多数情况下, 降水出现在GPS遥感的大气可降水量迅速增加的3~4h内; 每小时降水量峰值和GPS遥感的大气可降水量增量的大小有关。

Abstract: Previous study shows that GPS precipitable water vapor (PWV) and local precipitation have close relationship.Observation of 2002 Anhui province and 2000 Beijing experiment shows that 2-hour increment of GPS PWV and local precipitation have good relationship. The correlation coefficient in mountain area is about 70 %, larger than that in plain area. Rainfall occurs in 4 hours after the rapid increase of PWV.The maximum hourly rainfall is proportion to the PWV increment.