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Strong regional trends in extreme weather over the next two decades under high- and low-emissions pathways

Nature Geoscience volume 17, pages 845–850 (2024)Cite this article

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Abstract

Global warming is rapidly shifting climate conditions away from what societies and ecosystems are adapted to. While the magnitude of changes in mean and extreme climate are broadly studied, regional rates of change, a key driver of climate risk, have received less attention. Here we show, using large ensembles of climate model simulations, that large parts of the tropics and subtropics, encompassing 70% of current global population, are expected to experience strong (>2 s.d.) joint rates of change in temperature and precipitation extremes combined over the next 20 years, under a high-emissions scenario, dropping to 20% under strong emissions mitigation. This is dominated by temperature extremes, with most of the world experiencing unusual (>1 s.d.) rates relative to the pre-industrial period, but unusual changes also occur for precipitation extremes in northern high latitudes, southern and eastern Asia and equatorial Africa. However, internal variability is high for 20 year trends, meaning that in the near term, trends of the opposite sign are still likely for precipitation extremes, and rare but not impossible for temperature extremes. We also find that rapid clean-up of aerosol emissions, mostly over Asia, leads to accelerated co-located increases in warm extremes and influences the Asian summer monsoons.

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Fig. 1: Near-term trends in extremes indices compared with PI trends.
Fig. 2: Regional joint near-term trends in TXx and Rx5day.
Fig. 3: Spatial patterns of near-term joint rates of change in extremes, and their components.

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Data availability

The climate model data used for this analysis are publicly available from the ESGF portals, for example, https://esgf-data.dkrz.de/search/cmip6-dkrz/. ETCCDI indices for CMIP6 models are available from the Copernicus Climate Data Store at https://cds.climate.copernicus.eu/cdsapp#!/dataset/sis-extreme-indices-cmip6?tab=overview (ref. 46), with additional ensemble members calculated for this analysis available from Zenodo (https://doi.org/10.5281/zenodo.12704988) (ref. 47). ERA5 temperature and precipitation data are available from https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=overview (ref. 48). REGEN-LONG is available from https://doi.org/10.25914/5ca4c2c6527d2 (ref. 49) and REGEN-ALL from https://doi.org/10.25914/5ca4c380b0d44 (ref. 50). Population data are available from https://sedac.ciesin.columbia.edu/data/collection/gpw-v4 (refs. 31,45).

Code availability

The code used in this analysis is publicly available from Zenodo (https://zenodo.org/records/12704988) (ref. 47).

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Acknowledgements

This research has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements no. 101003826 through the CRiceS project (C.E.I., B.H.S., M.T.L., M.S.) and no. 820655 through the EXHAUSTION project (M.S.) and from the Norwegian Research Council through the projects CATHY (324182; C.E.I., B.H.S., M.T.L., N.S., L.J.W.) and QUISARC (248834; C.E.I., B.H.S., M.T.L.). We acknowledge the Centre for Advanced Study in Oslo, Norway, which funded and hosted our HETCLIF centre during the academic year of 2023/2024. We acknowledge the World Climate Research Programme, which, through its Working Group on Coupled Modelling, coordinated and promoted CMIP6. We thank the climate modelling groups for producing and making available their model output, the Earth System Grid Federation (ESGF) for archiving the data and providing access, and the multiple funding agencies who support CMIP6 and ESGF. We also acknowledge the ETCCDI indices for CMIP6 provided through the Copernicus Climate Data Store, documented in refs. 40,51.

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Authors and Affiliations

  1. CICERO Center for International Climate Research, Oslo, Norway

    Carley E. Iles, Bjørn H. Samset, Marit Sandstad, Nina Schuhen & Marianne T. Lund

  2. National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, UK

    Laura J. Wilcox

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Contributions

C.E.I. and B.H.S. conceived and designed the experiments. C.E.I. performed the experiments and analysed the data. M.S. contributed materials/analysis tools. C.E.I., B.H.S., M.S., N.S., L.J.W. and M.T.L. wrote the paper.

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Correspondence to Carley E. Iles.

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Nature Geoscience thanks Vikki Thompson and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editor: Tom Richardson, in collaboration with the Nature Geoscience team.

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Supplementary Information

Supplementary Figs. 1–26, Table 1 and text on rates of change in subsequent periods, effects of aerosol clean-up on near-term rates of change, model evaluation and results for CDD.

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Iles, C.E., Samset, B.H., Sandstad, M. et al. Strong regional trends in extreme weather over the next two decades under high- and low-emissions pathways. Nat. Geosci. 17, 845–850 (2024). https://doi.org/10.1038/s41561-024-01511-4

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