使用位势高度对计算加权平均温度的影响

The Effect of the Geopotential Height to Calculat Weighted Mean Temperature

加权平均温度(Tm)是GNSS测量大气可降水量的一个重要参数。计算Tm需要不同高度的高空气象资料,而探空数据和再分析资料的温度、湿度和气压通常是以位势高度的形式给出。基于全球范围不同气候区域的13个探空站长期观测数据,比较了使用位势高度和几何高度计算Tm的差异性。经过计算两者的差异性为:BIAS=0.006 2K和RMSE=0.007 4K。结果表明使用位势高度对计算加权平均温度的影响可以忽略,并适用于全球范围不同位置和不同季节。

The weighted mean temperature(T_m)is an important parameter for the measurement of precipitable water vapor by GNSS.The calculation of T_m requires weather data at different heights,while sounding data and reanalysis data are usually given in the form of geopotential height.In this paper,the difference between the geopotential height and the geometric height of the Tmis calculated by comparing the data of 13 sounding stations around the world.The differences between the two are:BIAS=0.006 2 Kand RMSE=0.007 4 K.The results show that the effect of the geopotential height used to calculate weighted mean temperature can be ignored and is suitable for different locations and seasons on the global scale.