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Anthropogenic intensification of short-duration rainfall extremes

Fowler, H. J., Lenderink, G., Prein, A. F., Westra, S., Allan, R. ORCID: https://orcid.org/0000-0003-0264-9447, Ban, N., Barbero, R., Berg, P., Blenkinsop, S., Do, H. X., Guerreiro, S. B., Haerter, J. O., Kendon, E., Lewis, E., Schaer, C., Sharma, A., Villarini, G., Wasko, C. and Zhang, X. (2021) Anthropogenic intensification of short-duration rainfall extremes. Nature Reviews Earth & Environment, 2. pp. 107-122. ISSN 2662-138X

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To link to this item DOI: 10.1038/s43017-020-00128-6

Abstract/Summary

Short- duration (1-3 h) rainfall extremes can cause serious damage to societies through rapidly developing (flash) flooding and are determined by complex, multifaceted processes that are altering as Earth's climate warms. In this Review, we examine evidence from observational, theoretical and modelling studies for the intensification of these rainfall extremes, the drivers and the impact on flash flooding. Both short- duration and long- duration (\textgreater1 day) rainfall extremes are intensifying with warming at a rate consistent with the increase in atmospheric moisture (~7% K-1), while in some regions, increases in short- duration extreme rainfall intensities are stronger than expected from moisture increases alone. These stronger local increases are related to feedbacks in convective clouds, but their exact role is uncertain because of the very small scales involved. Future extreme rainfall intensification is also modulated by changes to temperature stratification and large- scale atmospheric circulation. The latter remains a major source of uncertainty. Intensification of short- duration extremes has likely increased the incidence of flash flooding at local scales and this can further compound with an increase in storm spatial footprint to considerably increase total event rainfall. These findings call for urgent climate change adaptation measures to manage increasing flood risks.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary Research Centres (IDRCs) > Walker Institute
Science > School of Mathematical, Physical and Computational Sciences > National Centre for Earth Observation (NCEO)
Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:95124
Publisher:Nature

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