GPS/MET中水汽转换参数本地化研究与时空特性分析

GPS/MET localized water vapor conversion parameters study and analysis of space-time characteristics

随着全球定位系统(GPS)的高速发展,它在测绘科研领域的应用范围不断扩大,在GPS气象方向,可以通过地基GPS技术计算得到水汽转换参数,从而计算大气可降水量.使用本地化的水汽转换参数能有效提高GPS水汽反演的精度.本文利用中国西南地区2015-2018年12个探空站点数据,计算得到中国西南地区的年、季度、月和每日水汽转换参数,实现了水汽转换参数本地化研究.分析发现,在一定范围内,水汽转换参数Π随着站点高度的增加而逐渐增加,且我国西南地区的水汽转换参数Π的时空分布具有明显的气候分布特点和纬度地带性.

With the rapid development of the global positioning system,its application in the field of surveying and mapping has continued to increase.In the direction of GPS meteorology,we can calculate the water vapor conversion parameters through ground-based GPS technology to obtain the atmospheric precipitation.Using local corresponding water vapor conversion parameters can effectively improve the accuracy of GPS water vapor inversion.This paper uses the data from 12 sounding stations in Southwest China in 2015-2018 to calculate the annual,quarterly,monthly and daily water vapor conversion parameters in Southwest China,and realizes the localization of water vapor conversion parameters.The analysis shows that,within a certain range,the water vapor conversion parameterПgradually increases with the increase of the station height,and the temporal and spatial distribution of the water vapor conversion parameterΠin southwest China has obvious characteristics of climate distribution and latitude zonality.