河南省GPS数据反演大气可降水量与卫星产品对比分析

Comparative Analysis of Atmospheric Precipitable Water and Satellite Products Retrieved from GPS Data in Henan Province

本文利用河南省本地的地基GPS网,以2018年9月20日的数据为研究范围,并与MODIS卫星大气可降水量数据集MOD05相比,讨论了GPS探空可降水量与MODIS卫星数据的对比分析。结果表明:两者相关系数较好,相关系数在0.8左右,相对误差平均值在30%以内。说明MOD05产品与GPS数据反演大气可降水量在一定程度上保持一致性;MOD05产品与GPS数据反演大气可降水量和地面相对湿度无明显相关。此外,卫星反演的可降水量不能说明当时地面相对湿度的状态。

In this paper, based on the local ground-based GPS network in Henan Province, the comparative analysis of GPS sounding precipitable water and MODIS satellite data was discussed in comparison with MODIS Atmospheric precipitable water data set MOD05. The results showed that the correlation coefficients were good, the correlation coefficients were about 0.8, and the average relative error was less than 30%. It showed that the retrieval of Atmospheric precipitable water from MOD05 and GPS data was consistent to a certain extent, and there was no significant correlation between the retrieval of atmospheric precipitable water from MOD05 and GPS data and the relative humidity of the ground. In addition, the precipitation retrieved by satellite could not explain the relative humidity of the ground at that time.