Water storage changes in North America retrieved from GRACE gravity and GPS data  

作　　者：Wang Hansheng Xiang Longwei Jia Lulu Wu Patrick Steffen Holger Jiang Liming Shen Qiang 

机构地区：[1]State Key Laboratory of Geodesy and Earth's Dynamics,Institute of Geodesy and Geophysics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]National Earthquake Infrastructure Service [4]Department of Earth Sciences,University of Hong Kong [5]Lantmteriet

出　　处：《Geodesy and Geodynamics》2015年第4期267-273,共7页大地测量与地球动力学（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.41431070,41174016,41274026,41274024,41321063);National Key Basic Research Program of China(973 Program,2012CB957703);CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-05);The Chinese Academy of Sciences

摘　　要：As global warming continues,the monitoring of changes in terrestrial water storage becomes increasingly important since it plays a critical role in understanding global change and water resource management.In North America as elsewhere in the world,changes in water resources strongly impact agriculture and animal husbandry.From a combination of Gravity Recovery and Climate Experiment（GRACE） gravity and Global Positioning System（GPS） data,it is recently found that water storage from August,2002 to March,2011 recovered after the extreme Canadian Prairies drought between 1999 and 2005.In this paper,we use GRACE monthly gravity data of Release 5 to track the water storage change from August,2002 to June,2014.In Canadian Prairies and the Great Lakes areas,the total water storage is found to have increased during the last decade by a rate of 73.8 ± 14.5 Gt/a,which is larger than that found in the previous study due to the longer time span of GRACE observations used and the reduction of the leakage error.We also find a long term decrease of water storage at a rate of-12.0 ± 4.2 Gt/a in Ungava Peninsula,possibly due to permafrost degradation and less snow accumulation during the winter in the region.In addition,the effect of total mass gain in the surveyed area,on present-day sea level,amounts to-0.18 mm/a,and thus should be taken into account in studies of global sea level change.As global warming continues,the monitoring of changes in terrestrial water storage becomes increasingly important since it plays a critical role in understanding global change and water resource management.In North America as elsewhere in the world,changes in water resources strongly impact agriculture and animal husbandry.From a combination of Gravity Recovery and Climate Experiment（GRACE） gravity and Global Positioning System（GPS） data,it is recently found that water storage from August,2002 to March,2011 recovered after the extreme Canadian Prairies drought between 1999 and 2005.In this paper,we use GRACE monthly gravity data of Release 5 to track the water storage change from August,2002 to June,2014.In Canadian Prairies and the Great Lakes areas,the total water storage is found to have increased during the last decade by a rate of 73.8 ± 14.5 Gt/a,which is larger than that found in the previous study due to the longer time span of GRACE observations used and the reduction of the leakage error.We also find a long term decrease of water storage at a rate of-12.0 ± 4.2 Gt/a in Ungava Peninsula,possibly due to permafrost degradation and less snow accumulation during the winter in the region.In addition,the effect of total mass gain in the surveyed area,on present-day sea level,amounts to-0.18 mm/a,and thus should be taken into account in studies of global sea level change.

关 键 词：Canadian Prairies Great Lakes Ungava Peninsula Water storage changes Gravity Recovery and Climate Experiment （GRACE） data Global Positioning System （GPS） data Glacial isostatic adjustment Separation approach 

分 类 号：P223[天文地球—大地测量学与测量工程] P228.4[天文地球—测绘科学与技术]