利用CORS观测资料反演四川地区水汽含量及其变化特征分析

Analysis of Precipitable Water Vapor and Its Variations in Sichuan Using CORS Observation Data

利用四川地区58个CORS站2012~2014年的观测数据,使用GAMIT软件反演其大气水汽含量,并分析水汽含量的时空分布特征和变化趋势。结果显示,四川地区水汽含量的空间分布具有东多西少的特征。通过多元线性回归分析方法和PCA法得出水汽含量的分布特征与该地区的地形地势的线性关系。以CHDU、YBIN和HONY站为例,利用改进的经验模态分解结合频谱分析的方法,得到水汽含量的多周期特性。结果显示,3个站存在多个水汽含量的循环周期。

Using GAMIT software and observation data from 58 CORS stations in Sichuan province from 2012 to 2014, precipitable water vapor （PWV） is deduced. The spatial and temporal distributive characteristics and variation trends of PWV in Sichuan province in the past three years are analyzed. The results show that the spatial distribution of PWV is higher in the east than in the west. Using multiple linear regression and princi- pal component analysis, the relation of PWV and terrain can be linearized. Taking the CHDU, YBIN and HONY stations in Sichuan province as examples, the method of empirical mode decomposition combined with spectrum analysis is used to reflect the various periodic characteristics. The results show that the three sta- tions have several PWV cycles.