Long-term groundwater variations in Northwest India from satellite gravity measurements

	Long-term groundwater variations in Northwest India from satellite gravity measurements
	Chen, Jianli 1; Li, Jin2 ; Zhang, Zizhan 3; Ni, Shengnan 2
刊名	GLOBAL AND PLANETARY CHANGE
	2014-05-01
卷号	116 期号:1 页码:130-138
关键词	groundwater GRACE satellite gravity Northwest India depletion
英文摘要	Satellite gravity data from the Gravity Recovery and Climate Experiment (GRACE) provides quantitative measures of terrestrial water storage (TWS) change at large spatial scales. Combining GRACE-observed TWS changes and model estimates of water storage changes in soil and snow at the surface offers a means for measuring groundwater storage change. In this study, we re-assess long-term groundwater storage variation in the Northwest India (NWI) region using an extended record of GRACE time-variable gravity measurements, and a fully unconstrained global forward modeling method. Our new assessments based on the GRACE release-5 (RL05) gravity solutions indicate that during the 10 year period January 2003 to December 2012, the NWI groundwater depletion remains pronounced, especially during the first 5 years (01/2003-12/2007). The newly estimated depletion rates are similar to 20.4 +/- 7.1 Gigatonne (Gt)/yr averaged over the 10 year period, and 29.4 +/- 8.4 Gt/yr during the first 5 years. The yearly groundwater storage changes in the NWI region are strongly correlated with yearly precipitation anomalies. In 2009, the driest season of the decade, the groundwater depletion reaches nearly 80 Gt, while in the two relatively wet seasons, 2008 and 2011, the groundwater storages even see net increases of about 24 and 35 Gt, respectively. The estimated mean groundwater depletion rates for the first 5 years are significantly higher than previous assessments. The larger depletion rates may reflect the benefits from improved data quality of GRACE RL05 gravity solutions, and improved data processing method, which can more effectively reduce leakage error in GRACE estimates. Our analysis indicates that the neighboring Punjab Province of Pakistan (especially Northern Punjab) apparently also experiences significant groundwater depletion during the same period, which has partly contributed to the new regional groundwater depletion estimates. (C) 2014 The Authors. Published by Elsevier B.V.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	CLIMATE EXPERIMENT ; LAND SUBSIDENCE ; DEPLETION ; SUSTAINABILITY ; RECOVERY ; GRACE
收录类别	SCI
语种	英语
WOS记录号	WOS:000336708400010
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/16125]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Univ Texas Austin, Ctr Space Res, Austin, TX 78712 USA 2.Chinese Acad Sci, Shanghai Astron Observ, Beijing 100864, Peoples R China 3.Chinese Acad Sci, Wuhan Inst Geodesy & Geophys, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Chen, Jianli,Li, Jin,Zhang, Zizhan,et al. Long-term groundwater variations in Northwest India from satellite gravity measurements[J]. GLOBAL AND PLANETARY CHANGE,2014,116(1):130-138.
APA	Chen, Jianli,Li, Jin,Zhang, Zizhan,&Ni, Shengnan.(2014).Long-term groundwater variations in Northwest India from satellite gravity measurements.GLOBAL AND PLANETARY CHANGE,116(1),130-138.
MLA	Chen, Jianli,et al."Long-term groundwater variations in Northwest India from satellite gravity measurements".GLOBAL AND PLANETARY CHANGE 116.1(2014):130-138.