联合GNSS与GRACE重力卫星的青藏高原陆地水储量研究  

Reversion of Terrestrial Water Storage Variations by Combination of GNSS and GRACE Gravity Satellite

作　　者：汪钧韬 曹家铭 邹蓉[1] Wang Juntao;Cao Jiaming;Zou Rong(Institute of Geophysics&Geomatics,China University of Geosciences,Wuhan Hubei 430074,China)

机构地区：[1]中国地质大学地球物理与空间信息学院,湖北武汉430074

出　　处：《工程地球物理学报》2023年第1期32-42,共11页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金(编号:41731071,41674017)。

摘　　要：青藏高原水资源含量丰富,对我国经济社会发展及气候变化起着重大作用。利用重力反演与气候实验GRACE(Gravity Recovery and Climate Experiment)卫星数据或陆面水文模型能够对水资源进行监测,但这些方法存在着分辨率低、时延长及数据缺失等问题。针对这一问题,本文联合全球导航卫星系统GNSS(Global Navigation Satellite System)、GRACE与水文模型数据对青藏及其周边地区陆地水储量TWS(Terrestrial Water Storage)进行反演,并探究陆地水储量因素在GNSS垂向形变中的贡献。结果表明,三种技术手段得出的陆地水储量结果在研究区域内具有良好的一致性;并且利用最小二乘拟合的GNSS和GRACE结果表明,近年来青藏南缘及其周边地区陆地水总量以8 mm/a的速率下降。为了定量分析青藏高原内部陆地水储量在GNSS垂向形变中的贡献,在扣除GRACE垂向形变时间序列后,发现所有台站的加权均方根减小百分比为0.65,表明陆地水储量变化是影响地表垂向形变的主要因素之一。The Tibetan Plateau is rich in water resources,which plays an important role in China’s economic and social development and climate change.Using gravity recovery and climate experiment(GRACE)satellite data or land surface hydrological model can monitor water resources,but these methods have some disadvantages,such as low resolution,liable time extension and lack of data.To solve these problems,this paper combines global navigation satellite system(GNSS),GRACE and hydrological model data to inverse the terrestrial water storage(TWS)in Tibetan and its surrounding areas,and explore the contribution of TWS in the vertical deformation of GNSS.The results show that the results of TWS obtained by the three methods have good consistency in the research area.The results of GNSS and GRACE,the total amount of TWS in the southern Tibet and its surrounding areas show a decrease of 8mm/a in recent years.In order to quantitatively analyze the contribution of TWS in the vertical deformation of GNSS in the Tibetan Plateau,we deducted GRACE vertical deformation time series from those GNSS vertical deformations.The ratio of reduction of weighted root mean square of all stations is 0.65,suggesting that the change of TWS is one of the main factors affecting vertical deformation.

关 键 词：GNSS GRACE 陆地水储量 

分 类 号：P332[天文地球—水文科学]