Atmospheric weighted mean temperature models with vertical adjustment for Yunnan and Guizhou
The relationships between Tm and height,Tm and Ts in Yunnan-Guizhou region based on the charac-teristics of the terrain undulationare are analyzed.Two new Tm models with vertical adjustment are developed as YGTrop-Tm and YGMete-Tm established by ERA5 data from 2016 to 2018.The accuracy of the new models are evaluated by the models with ERA5 and radiosonde data in 2019 and compared with Bevis formula,GPT2w and CTrop.The results show that:taking ERA5 grid data as reference value,the RMS of YGTrop-Tm and YGMete-Tm are 2.72 and 2.16 K.Compared with Bevis formula,GPT2w-5 and GPT2w-1,the RMS of YGTrop-Tm de-crease by 20%,28%and 9%,the RMS of YGTrop-Tm is the same as that of CTrop.Compared with Bevis for-mula,GPT2w-5,GPT2w-1 and CTrop,the RMS of YGMete-Tm decrease by 36%,43%,28%and 20%.Tak-ing radiosonde data as reference value,the RMS of YGTrop-Tm is similar to that of Bevis formula and CTrop,which are 2.88,2.93 and 2.80 K,while the RMS of YGMete-Tm is 2.45 K,which is the minimum value.Compared with Bevis formula,GPT2w-5,GPT2w-1 and CTrop,the RMS decrease by 16%,21%,20%and 12%.In addition,YGTrop-Tm and YGMete-Tm have the theoretical RMS errors values of 0.25 and 0.21 mm,while the relative errors values are 1.01%and 0.86%.
YGTrop-TmYGMete-Tmatmospheric weighted mean temperatureGNSS precipitable water va-porYunnan and Guizhou
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