利用地基GPS资料分析成都地区大气可降水量

Analyzing precipitable water vapor of Chengdu area by ground-based GPS

利用成都地区GPS地震监测网的观测资料,通过Bernese软件求解获得CHDU、JYAN、PIXI、QLAI、RENS、ZHJI测站的天顶总延迟和湿延迟,运用湿延迟与大气可降水量之间的转换关系得到各测站大气可降水量,与站点地面实际降雨量及SONDE大气可降水量进行了比较分析。结果表明:地基GPS监测大气可降水量变化与地面实际降雨量有很强的相关性,与SONDE大气可降水量的平均差值为0.43 mm,均方偏差为2.56 mm。多站点GPS监测大气可降水量联合分析,对于研究区域大气可降水量的变化有一定的意义。

On the basis of the observed data from Chengdu GPS Earthquake Monitor Network, it obtained the tropospheric zenith delay and the wet zenith delay at CHDU, JYAN, PIXI, QLAI, RENS, ZHJI site by Bernese software, following the discussed relation between wet zenith delay parameters and precipitable water vapor（PWV）, it calculated the PWV over the six site, and compared with the ground rainfall and SONDE PWV at related sites. Results show that the PWV is very correlative with the ground rainfall; the average difference with SONDE PWV is 0. 43 mm with RMS of 2. 56 mm. In addition, combined analysis on multi-site PWV observations may help us research the change of total quantity of regional PWV.