气候变化领域集成服务门户(CCPortal): Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics

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DOI	10.5194/hess-23-2841-2019
	Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics
	Chaudhari S.; Pokhrel Y.; Moran E.; Miguez-Macho G.
发表日期	2019
ISSN	1027-5606
起始页码	2841
结束页码	2862
卷号	23 期号:7
英文摘要	We investigate the interannual and interdecadal hydrological changes in the Amazon River basin and its sub-basins during the 1980-2015 period using GRACE satellite data and a physically based, 2 km grid continental-scale hydrological model (LEAF-Hydro-Flood) that includes a prognostic groundwater scheme and accounts for the effects of land use-land cover (LULC) change. The analyses focus on the dominant mechanisms that modulate terrestrial water storage (TWS) variations and droughts. We find that (1) the model simulates the basin-averaged TWS variations remarkably well; however, disagreements are observed in spatial patterns of temporal trends, especially for the post-2008 period. (2) The 2010s is the driest period since 1980, characterized by a major shift in the decadal mean compared to the 2000s caused by increased drought frequency. (3) Long-term trends in TWS suggest that the Amazon overall is getting wetter (1.13 mm yr-1), but its southern and southeastern sub-basins are undergoing significant negative TWS changes, caused primarily by intensified LULC changes. (4) Increasing divergence between dry-season total water deficit and TWS release suggests a strengthening dry season, especially in the southern and southeastern sub-basins. (5) The sub-surface storage regulates the propagation of meteorological droughts into hydrological droughts by strongly modulating TWS release with respect to its storage preceding the drought condition. Our simulations provide crucial insight into the importance of sub-surface storage in alleviating surface water deficit across Amazon and open pathways for improving prediction and mitigation of extreme droughts under changing climate and increasing hydrologic alterations due to human activities (e.g., LULC change). © 2019 Author(s).
语种	英语
scopus关键词	Climate change; Digital storage; Geodetic satellites; Groundwater; Land use; Surface waters; Watersheds; Drought characteristics; Hydrologic alterations; Hydrological changes; Hydrological droughts; Hydrological modeling; Land use/ land covers; Meteorological drought; Terrestrial water storage; Drought; annual variation; drought stress; dry season; GRACE; hydrological change; hydrological modeling; satellite data; water storage; water stress; Amazon Basin
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159653
作者单位	Chaudhari, S., Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, United States; Pokhrel, Y., Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, United States; Moran, E., Department of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI 48824, United States; Miguez-Macho, G., Non-Linear Physics Group, Faculty of Physics, Universidade de Santiago de Compostela, Galicia, 15782, Spain
推荐引用方式 GB/T 7714	Chaudhari S.,Pokhrel Y.,Moran E.,et al. Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics[J],2019,23(7).
APA	Chaudhari S.,Pokhrel Y.,Moran E.,&Miguez-Macho G..(2019).Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics.Hydrology and Earth System Sciences,23(7).
MLA	Chaudhari S.,et al."Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics".Hydrology and Earth System Sciences 23.7(2019).