Anthropogenic climate change has changed frequency of past flood during 2010-2013

Yukiko Hirabayashi, Haireti Alifu, Dai Yamazaki, Yukiko Imada, Hideo Shiogama, Yuki Kimura

研究成果: Article査読

抄録

The ongoing increases in anthropogenic radiative forcing have changed the global water cycle and are expected to lead to more intense precipitation extremes and associated floods. However, given the limitations of observations and model simulations, evidence of the impact of anthropogenic climate change on past extreme river discharge is scarce. Here, a large ensemble numerical simulation revealed that 64% (14 of 22 events) of floods analyzed during 2010-2013 were affected by anthropogenic climate change. Four flood events in Asia, Europe, and South America were enhanced within the 90% likelihood range. Of eight snow-induced floods analyzed, three were enhanced and four events were suppressed, indicating that the effects of climate change are more likely to be seen in the snow-induced floods. A global-scale analysis of flood frequency revealed that anthropogenic climate change enhanced the occurrence of floods during 2010-2013 in wide area of northern Eurasia, part of northwestern India, and central Africa, while suppressing the occurrence of floods in part of northeastern Eurasia, southern Africa, central to eastern North America and South America. Since the changes in the occurrence of flooding are the results of several hydrological processes, such as snow melt and changes in seasonal and extreme precipitation, and because a climate change signal is often not detectable from limited observation records, large ensemble discharge simulation provides insights into anthropogenic effects on past fluvial floods. [Figure not available: see fulltext.]

本文言語English
論文番号36
ジャーナルProgress in Earth and Planetary Science
8
1
DOI
出版ステータスPublished - 2021 12

ASJC Scopus subject areas

  • 地球惑星科学(全般)

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