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Towards advancing scientific knowledge of climate change impacts on short-duration rainfall extremes

Lookup NU author(s): Professor Hayley Fowler, Dr Haider Ali, Dr Renaud Barbero, Dr Stephen Blenkinsop, Dr Steven Chan, Dr Selma Guerreiro, Dr Abdullah Kahraman, Dr Elizabeth Lewis, Dr Xiaofeng Li, Katy Peat, Dr David Pritchard, Roberto Villalobos Herrera

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Abstract

A large number of recent studies have aimed at understanding short-duration rainfall extremes, due to their impacts on flash floods, landslides and debris flows and potential for these to worsen with global warming. This has been led in a concerted international effort by the INTENSE Crosscutting Project of the GEWEX (Global Energy and Water Exchanges) Hydroclimatology Panel. Here, we summarize the main findings so far and suggest future directions for research, including: the benefits of convection-permitting climate modelling; towards understanding mechanisms of change; the usefulness of temperature-scaling relations; towards detecting and attributing extreme rainfall change; and the need for international coordination and collaboration. Evidence suggests that the intensity of long-duration (1 day+) heavy precipitation increases with climate warming close to the Clausius-Clapeyron (CC) rate (6-7% K-1), although large-scale circulation changes affect this response regionally. However, rare events can scale at higher rates, and localized heavy short-duration (hourly and sub-hourly) intensities can respond more strongly (e.g. 2 × CC instead of CC). Day-to-day scaling of short-duration intensities supports a higher scaling, with mechanisms proposed for this related to local-scale dynamics of convective storms, but its relevance to climate change is not clear. Uncertainty in changes to precipitation extremes remains and is influenced by many factors, including large-scale circulation, convective storm dynamics andstratification. Despite this, recent research has increased confidence in both the detectability and understanding of changes in various aspects of intense short-duration rainfall. To make further progress, the international coordination of datasets, model experiments and evaluations will be required, with consistent and standardized comparison methods and metrics, and recommendations are made for these frameworks. This article is part of a discussion meeting issue 'Intensification of short-duration rainfall extremes and implications for flash flood risks'.


Publication metadata

Author(s): Fowler HJ, Ali H, Allan RP, Ban N, Barbero R, Berg P, Blenkinsop S, Cabi NS, Chan S, Dale M, Dunn RJH, Ekstrom M, Evans JP, Fosser G, Golding B, Guerreiro SB, Hegerl GC, Kahraman A, Kendon EJ, Lenderink G, Lewis E, Li X, O'Gorman PA, Orr HG, Peat KL, Prein AF, Pritchard D, Schar C, Sharma A, Stott PA, Villalobos-Herrera R, Villarini G, Wasko C, Wehner MF, Westra S, Whitford A

Publication type: Article

Publication status: Published

Journal: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

Year: 2021

Volume: 379

Issue: 2195

Print publication date: 19/04/2021

Online publication date: 01/03/2021

Acceptance date: 14/01/2021

ISSN (print): 1364-503X

ISSN (electronic): 1471-2962

Publisher: Royal Society Publishing

URL: https://doi.org/10.1098/rsta.2019.0542

DOI: 10.1098/rsta.2019.0542

PubMed id: 33641464


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