题名: Understanding the global hydrological droughts of 2003-2016 and their relationships with teleconnections
作者: Mostafaie, A.1; Awange, J.10; Shum, C. K.2,3; Ramillien, G.4; Akinluyi, F.5; Farzaneh, S.6; Brocca, L.7; van Dijk, A. I. J. M.8; Mehrnegar, N.12; Wulfmeyer, V11; Schumacher, M.11; Khaki, M.9,10; Forootan, E.11,12
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
出版日期: 2019-02-10
卷号: 650, 页码:2587-2604
ISSN号: 0048-9697
关键词: GRACE Terrestrial Water Storage (TWS) ; Global droughts ; Canonical Correlation Analysis (CCA) ; Sea Surface Temperature (SST) ; Teleconnections ; Drought hot spots
DOI: 10.1016/j.scitotenv.2018.09.231
英文摘要: Droughts often evolve gradually and cover large areas, and therefore, affect many people and activities. This motivates developing techniques to integrate different satellite observations, to cover large areas, and understand spatial and temporal variability of droughts. In this study, we apply probabilistic techniques to generate satellite derived meteorological, hydrological, and hydro-meteorological drought indices for the world's 156 major river basins covering 2003-2016. The data includes Terrestrial Water Storage (TWS) estimates from the Gravity Recovery And Climate Experiment (GRACE) mission, along with soil moisture, precipitation, and evapotranspiration reanalysis. Different drought characteristics of trends, occurrences,areal-extent, and frequencies correspondingto 3-, 6-, 12-, and 24-month timescales are extracted from these indices. Drought evolution within selected basins of Africa, America, and Asia is interpreted. Canonical Correlation Analysis (CCA) is then applied to find the relationship between global hydro-meteorological droughts and satellite derived Sea Surface Temperature (SST) changes. This relationship is then used to extract regions, where droughts and teleconnections are strongly interrelated. Our numerical results indicate that the 3- to 6-month hydrological droughts occur more frequently than the other timescales. Longer memory of water storage changes (than water fluxes) has found to be the reason of detecting extended hydrological droughts in regions such as the Middle East and Northern Africa. Through CCA, we show that the El Nino Southern Oscillation (ENSO) has major impact on the magnitude and evolution of hydrological droughts in regions such as the northern parts of Asia and most parts of the Australian continent between 2006 and 2011, as well as droughts in the Amazon basin, South Asia, and North Africa between 2010 and 2012. The Indian ocean Dipole (IOD) and North Atlantic Oscillation (NAO) are found to have regional influence on the evolution of hydrological droughts. (C) 2018 Elsevier B.V. All rights reserved.
资助项目: Cardiff University ; National Natural Science Foundation of China (NSFC)[41374020] ; Belmont Forum/IGFA G8 via US National Science Foundation[ICER-1342644]
WOS研究方向: Environmental Sciences & Ecology
语种: 英语
WOS记录号: WOS:000447871400088
出版者: ELSEVIER SCIENCE BV
Citation statistics:
内容类型: 期刊论文
URI标识: [http://202.127.146.157/handle/2RYDP1HH/6057]  
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作者单位: 1.Univ Zabol, Fac Engn, Surveying Dept, Zabol, Iran
2.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan, Hubei, Peoples R China
3.Ohio State Univ, Sch Earth Sci, Div Geodet Sci, Columbus, OH 43210 USA
4.CNRS, Paris, France
5.Fed Univ Technol Akure, Sch Earth & Mineral Sci, Dept Remote Sensing & Geosci Informat Syst, Akure, Nigeria
6.Univ Tehran, Coll Engn, Sch Surveying & Geospatial Engn, Tehran, Iran
7.CNR, Res Inst Geohydrol Protect, Perugia, Italy
8.Australian Natl Univ, Fenner Sch Environm & Soc, Canberra, ACT, Australia
9.Univ Newcastle, Sch Engn, Callaghan, NSW, Australia
10.Curtin Univ, Sch Earth & Planetary Sci, Discipline Spatial Sci, Perth, WA, Australia
11.Univ Hohenheim, IPM, Stuttgart, Germany
12.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff, S Glam, Wales
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