云贵地区顾及高度改正的大气加权平均温度模型
Atmospheric weighted mean temperature models with vertical adjustment for Yunnan and Guizhou
陈明 1陈天伟 1韦海福 1刘鹏 1刘晋 1贾相苹1
作者信息
- 1. 桂林理工大学 测绘地理信息学院,广西 桂林 541006;桂林理工大学 广西空间信息与测绘重点实验室,广西 桂林 541006
- 折叠
摘要
针对云贵地区地形起伏特点,分析Tm 与高程、Ts 的关系,利用2016-2018 年的ERA5 数据,建立两种顾及高度改正的Tm 模型——YGTrop-Tm 和YGMete-Tm.以 2019 年ERA5 和探空数据为参考值,结合Bevis公式、GPT2w和CTrop模型,对新模型精度进行评估.结果表明,以ERA5 数据为参考值,YGTrop-Tm和YGMete-Tm模型的年均RMS分别为2.72和2.16 K,相较于Bevis公式、GPT2w-5和GPT2w-1模型,YGTrop-Tm模型RMS 减少了 20%、28%、9%,与CTrop 模型相当,而YGMete-Tm 模型RMS 相较于 Bevis 公式、GPT2w-5、GPT2w-1和CTrop模型减少了36%、43%、28%和20%;以探空数据为参考值,YGTrop-Tm模型年均RMS与Bevis公式和CTrop模型相当,分别为2.88、2.93和2.80 K,而YGMete-Tm模型的年均RMS最小,为2.45 K,相较于Bevis公式、GPT2w-5、GPT2w-1 和CTrop模型,减少了 16%、21%、20%和 12%.此外,将YGTrop-Tm和YGMete-Tm模型用于GNSS水汽计算,对应的水汽理论RMS误差分别为0.25和0.21 mm,相对误差分别为1.01%和0.86%.
Abstract
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%.
关键词
YGTrop-Tm模型/YGMete-Tm模型/大气加权平均温度/GNSS大气水汽/云贵地区Key words
YGTrop-Tm/YGMete-Tm/atmospheric weighted mean temperature/GNSS precipitable water va-por/Yunnan and Guizhou引用本文复制引用
基金项目
广西自然科学基金项目(2017GXNSFAA198308)
广西空间信息与测绘重点实验室主任基金项目(15-140-07-09)
出版年
2024