青藏高原大气可降水量单站观测对比分析

A comparative analysis of precipitable water vapor in the Tibetan Plateau

中文关键词:  青藏高原  大气可降水量  地基GNSS  探空  卫星产品  对比分析

英文关键词:Tibetan Plateau  Precipitable water vapor  Ground-based GNSS  Radiosonde  Satellite products  Comparative analysis

中文摘要:

      为了探讨青藏高原大气可降水量观测资料的可靠性，对2015年6-9月西藏申扎、改则和那曲3站地基GNSS遥感的大气可降水量、同址探空观测的大气可降水量、风云三号可见光红外扫描辐射计反演的晴空大气可降水量、MODIS大气可降水量和NCEP可降水量进行对比分析。结果表明：探空可降水量和地基GNSS可降水量的偏差较小，均低于2.5 mm。风云三号可降水量明显偏低，与其他观测结果的偏差超过6 mm。全自动探空可降水量离散程度较L波段探空大，均方根误差超过4 mm。

英文摘要:

      In order to investigate the reliability of the observation of precipitable water vapor in the Tibetan Plateau,this article compares and analyzes five different observations collected at Naqu, Gaize and Shenzha from June to September 2015. Observations include the GNSS PW, the radiosonde PW, the FY-3 visible infrared scanning radiometer sensing data (FY-3 PW), the MODIS remote sensing data and the NCEP gridded reanalysis data (NCEP PW). The result shows that the radiosonde PW and the GNSS PW are closed with the differences less than 2.5 mm. FY-3 PW is significantly drier than the other observations, and the biases are larger than 6 mm.The degree of dispersion for precipitable water vapor observed by the automatic sounding systems at Gaize and Shenzha stations is obviously larger than that by the L-band electron radiosonde at Naqu Station, and the RMSE is larger than 4 mm.