摘要
选取大气可降水量的地基GPS水汽遥感法,探空反演法以及经验公式计算法,以贵州西部的威宁作为研究个例,对比分析3种方法在乌蒙山区对大气可降水量反演的异同。以探空反演结果作为基准值,得出地基GPS遥感水汽值和经验公式计算值较基准值偏大,3个方法的反演值之间具有很好的相关性,地基GPS遥感水汽值与探空反演值之间的相关性最好,平均绝对误差值最小,为3.5mm,均方根误差为4.14mm。在乌蒙山区,对流层加权平均温度(Tm)的本地经验公式与探空计算值之间的平均误差为1.1K,本地Tm公式对大气可降水量反演的结果影响较小。有降水事件发生及昆明准静止锋常驻的11月至次年4月,GPS水汽反演精度较高,平均绝对误差仅为1mm。5—10月,经验计算方法的计算精度较高,平均绝对误差为0.74mm。
Selecting three calculation methods of atmospheric precipitable water： ground-based GPS remote sensing water vapor, radiosonde data inversion, and empirical formula methods, taking Weining as an example, the similarities and differences of three methods in the Wumeng Mountain area are analyzed. It is concluded that selecting the radiosonde inversion value as the baseline, the results of GPS remote sensing and empirical formulas are bigger than the baseline; there is a good correlation among three values, especially between GPS remote sensing and radiosonde inversion; the minimum average absolute error value is 3.5 mm and the root mean square error is 4.14 mm. The empirical formulas of the weighted mean tropospheric temperature for the Wumeng mountain area is established, with the average error between empirical formulas and baseline is 1.1 K. The empirical formulas of weighted average air temperature have little influence on the atmospheric precipitable water. The GPS inversion accuracy of water vapor is higher there is precipitation and the quasi-stationary front over Kunming between November and April, the average absolute error being only 1 mm. The average absolute error between radiosonde inversion xperience calculation is 0.74 mm from May to October.
出处
《气象科技》
北大核心
2015年第3期387-392,共6页
Meteorological Science and Technology
基金
公益性行业科研专项"我国西南非绝热加热敏感区综合观测试验"(GYHY201006054)
"十二五"国家科技支撑计划课题"西南突发性灾害应急与防控技术集成与示范"(2012BAD20B06)资助
关键词
地基GPS遥感
探空反演
经验公式
大气可降水量
Ground-based GPS remote sensing
sounding inversion
empirical formula, atmospheric precipitable water
