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Enhanced flood risk with 1.5°C global warming in the Ganges-Brahmaputra-Meghna basin

Research output: Contribution to journalArticle

Original languageEnglish
JournalEnvironmental Research Letters
DOIs
DateAccepted/In press - 19 Mar 2019

Abstract

Flood hazard is a global problem, but regions such as south Asia, where people's livelihoods are highly dependent on water resources, can be affected disproportionally. The 2017 monsoon flooding in the Ganges-Brahmaputra-Meghna (GBM) basin, with record river levels observed, resulted in ~1200 deaths, and dramatic loss of crops and infrastructure. The recent Paris Agreement called for research into impacts avoided by stabilizing climate at 1.5°C over 2°C global warming above pre-industrial conditions. Climate model scenarios representing these warming levels were combined with a high-resolution flood hazard model over the GBM region. The simulations of 1.5°C and 2°C warming indicate an increase in extreme precipitation and corresponding flood hazard over the GBM basin compared to the current climate. So, for example, even with global warming limited to 1.5°C, for extreme precipitation events such as the south Asian crisis in 2017 there is a detectable increase in the likelihood in flooding. The additional ~0.6°C warming needed to take us from current climate to 1.5°C highlights the changed flood risk even with low levels of warming. An analysis of other large river basins around the world also showed the majority will see increases in extreme precipitation, but the GBM, with a particularly vulnerable population, shows one of the largest increases.

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  • Uhe+et+al_2019_Environ._Res._Lett._10.1088_1748-9326_ab10ee

    Accepted author manuscript, 14 MB, PDF-document

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