基于GNSS的中国大陆地区COSMIC-2 PWV精度分析

COSMIC-2可提供连续大气数据源用于改进天气预报，有助于对极端天气进行监测预警。将中国大陆地区按照气候类型划分成5个区域，依托CMONOC站点PWV序列，开展COSMIC-2 PWV在中国大陆地区的精度分析。从站间距离和高程2个角度进行COSMIC-2掩星点与GNSS站点PWV匹配方案设计，分别针对中国大陆地区、不同气候类型和部分代表站点开展COSMIC-2精度评定。研究表明，高原山地、温带大陆、温带季风、亚热带季风和热带季风气候类型的RMSE分别为1.40 mm、1.49 mm、2.68 mm、3.11 mm和3.16 mm；内陆地区精度优于沿海地区。

Accuracy Analysis of COSMIC-2 PWV in Chinese Mainland Based on GNSS

COSMIC-2 provides continuous atmospheric data for improving weather forecasts, which are helpful for monitoring and warning of extreme weather. We divide Chinese mainland into five regions according to climate type and analyze the accuracy of COSMIC-2 PWV in Chinese mainland based on the water vapor sequence of CMONOC station. From the perspectives of distance and elevation between stations, we design the PWV matching scheme of COSMIC-2 occultation points and GNSS stations. We evaluate the accuracy of COSMIC-2 for different climate types in China. The results show that the RMSE of plateau mountain, temperate continental, temperate monsoon, subtropical monsoon, and tropical monsoon climate types are 1.40 mm, 1.49 mm, 2.68 mm, 3.11 mm, and 3.16 mm, respectively. The accuracy in inland area is better than that in coastal area.