气候变化领域集成服务门户(CCPortal): Water level changes; subsidence; and sea level rise in the Ganges-Brahmaputra-Meghna delta

CCPortal

DOI	10.1073/pnas.1912921117
	Water level changes; subsidence; and sea level rise in the Ganges-Brahmaputra-Meghna delta
	Becker M.; Papa F.; Karpytchev M.; Delebecque C.; Krien Y.; Khan J.U.; Ballu V.; Durand F.; Le Cozannet G.; Islam A.K.M.S.; Calmant S.; Shum C.K.
发表日期	2020
ISSN	0027-8424
起始页码	1867
结束页码	1876
卷号	117 期号:4
英文摘要	Being one of the most vulnerable regions in the world, the Ganges-Brahmaputra-Meghna delta presents a major challenge for climate change adaptation of nearly 200 million inhabitants. It is often considered as a delta mostly exposed to sea-level rise and exacerbated by land subsidence, even if the local vertical land movement rates remain uncertain. Here, we reconstruct the water-level (WL) changes over 1968 to 2012, using an unprecedented set of 101 water-level gauges across the delta. Over the last 45 y, WL in the delta increased slightly faster (∼3 mm/y), than global mean sea level (∼2 mm/y). However, from 2005 onward, we observe an acceleration in the WL rise in the west of the delta. The interannual WL fluctuations are strongly modulated by El Niño Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) variability, with WL lower than average by 30 to 60 cm during cooccurrent El Niño and positive IOD events and higher-thanaverage WL, by 16 to 35 cm, during La Niña years. Using satellite altimetry and WL reconstructions, we estimate that the maximum expected rates of delta subsidence during 1993 to 2012 range from 1 to 7 mm/y. By 2100, even under a greenhouse gas emission mitigation scenario (Representative Concentration Pathway [RCP] 4.5), the subsidence could double the projected sea-level rise, making it reach 85 to 140 cm across the delta. This study provides a robust regional estimate of contemporary relative WL changes in the delta induced by continental freshwater dynamics, vertical land motion, and sea-level rise, giving a basis for developing climate mitigation strategies. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Bangladesh; Delta; Sea level; Subsidence; Water level
语种	英语
scopus关键词	fresh water; water; acceleration; Article; atmospheric moisture; carbon footprint; climate change; controlled study; dynamics; El Nino; environmental impact; environmental parameters; evolution; evolutionary adaptation; India; priority journal; sea level; sea surface temperature; stream (river); subsidence; water analysis
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159029
作者单位	Becker, M., Littoral Environnement et Sociétés, Centre National de la Recherche Scientifique, Université de la Rochelle, La Rochelle, 17000, France; Papa, F., Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Centre National de la Recherche Scientifique, Institut de Recherche Pour le Développement, Université Toulouse Paul Sabatier, Centre National d'Études Spatiales, Toulouse, 31400, France, Indo-French Cell for Water Sciences, International Joint Laboratory Institut de Recherche Pour le Développement, Indian Institute of Science, Bangalore, 560012, India; Karpytchev, M., Littoral Environnement et Sociétés, Centre National de la Recherche Scientifique, Université de la Rochelle, La Rochelle, 17000, France; Delebecque, C., Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Centre National de la Recherche Scientifique, Institut de Recherche Pour le Développement, Université Toulouse Paul Sabatier, Centre National d'Études Spatiales, Toulouse, 31400, France; Krien, Y., Laboratoire...
推荐引用方式 GB/T 7714	Becker M.,Papa F.,Karpytchev M.,et al. Water level changes; subsidence; and sea level rise in the Ganges-Brahmaputra-Meghna delta[J],2020,117(4).
APA	Becker M..,Papa F..,Karpytchev M..,Delebecque C..,Krien Y..,...&Shum C.K..(2020).Water level changes; subsidence; and sea level rise in the Ganges-Brahmaputra-Meghna delta.Proceedings of the National Academy of Sciences of the United States of America,117(4).
MLA	Becker M.,et al."Water level changes; subsidence; and sea level rise in the Ganges-Brahmaputra-Meghna delta".Proceedings of the National Academy of Sciences of the United States of America 117.4(2020).