利用GPS技术反演中国大陆水汽变化

Retrieving Change of Precipitable Water Vapor in Chinese Mainland by GPS Technique

利用中国地壳运动监测网络2004年的GPS数据,结合测站对应气象要素,计算出大气中的水汽。采用张性样条网格化法绘制中国大陆地区2004年各月份的水汽变化图,得到了水汽含量整体变化趋势与中国年降水量分布趋势相一致的结论。

The feasibility of GPS precipitable water vapor is discussed according to the comparison of Radiosonde and GPS precipitable water vapor which the correlation coefficient was 0.94 and the RMS was 4.0 mm. Precipitable water vapor change in Chinese mainland in 2004 is figured with the gridding method of splines in tension, according to the GPS data of the crust monitor observation network of China, combined with the relevant meteorology information. According to the distribution of Chinese annual amount of rainfall, it can be concluded that the total trend of the precipitable water vapor is diminishing from the south-east coastland to the north-west inland. In China, the precipitable water vapor reaches the apex during july and august, and it countermarches the trough during january and february. According to the precipitable water vapor, from high to low, all districts can be ranked as south-east coastland, the inland and the tableland.