GNSS技术下北京7·21暴雨水汽含量反演分析

Analysis of Atmospheric Water Vapor Content Reversion in Beijing 7·21 Rainstorm Based on GNSS

介绍了利用GNSS观测数据反演大气可降水量的原理,重点分析了北京7·21暴雨前后大气可降水量的变化特征。通过分析发现北京7·21暴雨当天大气中的可降水量急剧上升,在短时间内迅速到达峰值,随着暴雨的减弱,大气中可降水量逐渐减少,暴雨过后可降水量又急剧下降,回归到北方地区正常可降水量。将GNSS反演结果与NECP数据和无线电探空数据进行了比较分析,论证了利用GNSS观测数据反演大气可降水量的正确性和可靠性。

This paper introduces the principle of using GNSS observation data to retrieve atmospheric precipitable water, and analyzes the variation characteristics of atmospheric precipitation before and after 2012 Beijing rainstorm.It is found that on 21st July 2012 the precipitation in the atmosphere of Beijing was increasing rapidly in the short time.With the rainstorm weakening,the precipitation in the atmosphere was gradually reduced, and the precipitation would drop sharply after the rainstorm, and return to the normal level in the northern area.In addition,the comparison between GNSS analysis results and NECP data as well as radiosonde data demonstrates the correctness and reliability of using GNSS observation data to inverse atmospheric precipitation.