利用重力卫星观测资料解算中国大陆水储量变化

RECOVERY OF LAND WATER STORAGE VARIATIONS IN CHINESE MAINLAND BY USE OF GRACE DATA

利用GRACE重力卫星2002年4月～2004年7月共计20个月的时变重力场数据,反演了中国大陆空间大尺度陆地水储量变化,并将该结果与美国气候预测中心(CPC)的全球水文模式结果进行了比较。结果显示:GRACE的结果与水文模式结果在大多数区域符合得相当好:在西藏、西南和华南地区,水储量季节性变化的幅值达到12～14cm;在华东、华中、西北东部地区,水储量季节性变化的幅度一般在8cm左右;在新疆地区,水储量季节性变化很小。而在华北、东北地区,GRACE的结果与模式结果存在较大差别。

The variations of water storage at large space scales in Chinese mainland are in,versed by use of 20- month GRACE gravity field solutions （from April 2002 to July 2004）. Chinese mainland is divided into 8 major typical regions, the monthly variations of water storage in each region are calculated respectively, and then the results are compared with that derived from the NOAA＇ s CPC （ Climate Prediction Center） hydrologic model. The comparison results show good consistencies in most regions： in Tibet, Southwest and South China, the amplitude of annual variations in water storage are about 12 - 14 cm, the maximum and minimum values appear in September and April respectively; and there are variations of about 8cm in East ＆ Central China and the eastern part of Southwest China,in Xinjiang area, the variation is obvious. However, in North ＆ Northeast China, there are obvious differences between the GRACE and CPC modeled results.