干旱区生态环境知识资源中心(Arid): Contributions of climate change and groundwater extraction to soil moisture trends

Arid

DOI	10.5194/esd-10-599-2019
	Contributions of climate change and groundwater extraction to soil moisture trends
	Wang, Longhuan 1,2; Xie, Zhenghui 1; Jia, Binghao 1; Xie, Jinbo 1; Wang, Yan 1,2; Liu, Bin 1,2; Li, Ruichao 1,2; Chen, Si 1,2
通讯作者	Xie, Zhenghui
来源期刊	EARTH SYSTEM DYNAMICS
ISSN	2190-4979
EISSN	2190-4987
出版年	2019
卷号	10 期号:3 页码:599-615
英文摘要	Climate change affects water availability for soil, and groundwater extraction influences water redistribution by altering water demand, both of which significantly affect soil moisture. Quantifying their relative contribution to the changes in soil moisture will further our understanding of the mechanisms underlying the global water cycle. In this study, two groups of simulations were conducted with and without groundwater (GW) extraction (estimated based on local water supply and demand) from 1979 to 2010 using the Chinese Academy of Sciences land surface model, CAS-LSM, with four global meteorological forcing datasets (GSWP3, PRINCETON, CRU-NCEP, and WFDEI). To investigate the contribution of climate change and GW extraction, a trajectory-based method was used. Comparing the simulated results with the in situ dataset of the International Soil Moisture Network (ISMN) and the satellite-based soil moisture product of the European Space Agency's Climate Change Initiative (ESA-CCI) indicated that the CAS -LSM reasonably reproduced the distribution of soil moisture and matched the temporal changes well. Globally, our results suggested a significant decreasing trend in surface soil moisture (0-10 cm, 0.98 x 10(-4) mm(3) mm(-3) yr(-1)) over the 32-year period tested. The drying trends were mainly observed in arid regions such as the tropical desert regions in North Africa and the Arabian Peninsula, while the wetting trends were primarily in tropical forested areas in South America and northeastern Asia. Climate change contributed 101.2 % and 90.7 % to global drying and wetting trends of surface soil moisture, respectively, while GW extraction accounted for -1.2 % and 9.3 %, respectively. In deep soil, GW extraction contributed 1.37 % and -3.21 % to the drying and wetting trends, respectively. The weak influence of GW extraction may be because this activity occurs in limited areas. GW extraction contributed more than 35 % to the change in surface soil moisture in wetting areas where GW overexploitation occurs. GW is mainly extracted for irrigation to alleviate soil water stress in semiarid regions that receive limited precipitation, thereby slowing the drying trend and accelerating the wetting trend of surface soil. However, GW exploitation weakens the hydraulic connection between the soil and aquifer, leading to deeper soils drying up. Overall, climate change dominated the soil moisture trends, but the effect of GW extraction cannot be ignored.
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000488765400001
WOS关键词	HAIHE RIVER-BASIN ; LAND-SURFACE ; PRODUCTS ; IMPACTS ; EXPLOITATION ; IRRIGATION ; RESPONSES ; NETWORK ; FLUXES ; MAP
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	中国科学院大气物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215100
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China; 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Longhuan,Xie, Zhenghui,Jia, Binghao,et al. Contributions of climate change and groundwater extraction to soil moisture trends[J]. 中国科学院大气物理研究所,2019,10(3):599-615.
APA	Wang, Longhuan.,Xie, Zhenghui.,Jia, Binghao.,Xie, Jinbo.,Wang, Yan.,...&Chen, Si.(2019).Contributions of climate change and groundwater extraction to soil moisture trends.EARTH SYSTEM DYNAMICS,10(3),599-615.
MLA	Wang, Longhuan,et al."Contributions of climate change and groundwater extraction to soil moisture trends".EARTH SYSTEM DYNAMICS 10.3(2019):599-615.