地基GPS遥测大气可降水量应用精度和范围

利用2005年6～8河北省石家庄、张家口两个地基GPS站反演得到的大气可降水量资料,对探空资料计算的大气可降水量和GPS反演的大气可降水量进行比较,并通过2007年7月17～19日河北中南部一次强降水过程的个例分析,发现GPS资料反演的大气可降水量略高于探空站资料的计算结果,但两种资料的可降水量计算结果变化趋势一致,GPS反演的大气可降水量具有较高的使用价值,但单站GPS反演的大气可降水量有效半径距离具有一定限度.

Application Precision and Range of Precipitable Water Vapor Measured by Ground-Based GPS

By means of the atmospheric precipitable water vapor data measured by ground based GPS at Shijiazhuang and Zhangjiakou, a comparison is made between the radiosonde calculated and the GPS retrieved precipitable water. A severe precipitation case occurred in the southern Hebei Province in July 2007 is analyzed. It is found out that the GPS retrieval of precipitable water, which is slightly greater than the radiosonde derived, is more reliable and useful; the results of the two methods have accordant variation trends. For the single station, there exist certain limitations in the effective radius of the GPS retrieved perceptible water.