Abstract
Hydroclimate volatility refers to sudden, large and/or frequent transitions between very dry and very wet conditions. In this Review, we examine how hydroclimate volatility is anticipated to evolve with anthropogenic warming. Using a metric of âhydroclimate whiplashâ based on the Standardized Precipitation Evapotranspiration Index, global-averaged subseasonal (3-month) and interannual (12-month) whiplash have increased by 31â66% and 8â31%, respectively, since the mid-twentieth century. Further increases are anticipated with ongoing warming, including subseasonal increases of 113% and interannual increases of 52% over land areas with 3â°C of warming; these changes are largest at high latitudes and from northern Africa eastward into South Asia. Extensive evidence links these increases primarily to thermodynamics, namely the rising water-vapour-holding capacity and potential evaporative demand of the atmosphere. Increases in hydroclimate volatility will amplify hazards associated with rapid swings between wet and dry states (including flash floods, wildfires, landslides and disease outbreaks), and could accelerate a water management shift towards co-management of drought and flood risks. A clearer understanding of plausible future trajectories of hydroclimate volatility requires expanded focus on the response of atmospheric circulation to regional and global forcings, as well as landâoceanâatmosphere feedbacks, using large ensemble climate model simulations, storm-resolving high-resolution models and emerging machine learning methods.
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Data availability
All ERA5 data are publicly available via https://cds.climate.copernicus.eu. NCD20C data are available via https://rda.ucar.edu/datasets/d131003/dataaccess. All CESM2-LE data are available via https://www.cesm.ucar.edu/community-projects/lens2/data-sets. Hydroclimate whiplash data can be found via the Zenodo repository at https://doi.org/10.5281/zenodo.13381749 (ref. 188).
Code availability
Code used to generate hydroclimate whiplash data can be found via the Zenodo repository at https://doi.org/10.5281/zenodo.13381749 (ref. 188).
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Acknowledgements
D.L.S. was supported through a collaboration between UCLA, the NSF National Science Foundation National Center for Atmospheric Research and The Nature Conservancy of California. M.B. acknowledges funding from the Swiss National Science Foundation SNSF through the âConsecutive drought-flood events in a warming worldâ project (ConDF, grant number 200021_214907). This material is based upon work supported by the NSF National Center for Atmospheric Research, which is a major facility sponsored by the US National Science Foundation under Cooperative Agreement No. 1852977.
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Conceptualization by D.L.S., A.F.P., J.T.A., C.M.A., M.B., N.S.D., D.S., C.B.S. and D.T. Methodology by D.L.S., A.F.P., J.T.A., C.M.A., M.B., N.S.D., D.S., C.B.S. and D.T. Data acquisition and curation by D.L.S., A.F.P. and J.T.A. Investigation by D.L.S., A.F.P. and J.T.A. Visualization by D.L.S., A.F.P., J.T.A., D.S. and C.B.S. Writing â original draft by D.L.S. Writing â review and editing by D.L.S., A.F.P., J.T.A., C.M.A., M.B., N.S.D., D.S., C.B.S. and D.T. Project administration by D.L.S.
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Swain, D.L., Prein, A.F., Abatzoglou, J.T. et al. Hydroclimate volatility on a warming Earth. Nat Rev Earth Environ 6, 35â50 (2025). https://doi.org/10.1038/s43017-024-00624-z
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DOI: https://doi.org/10.1038/s43017-024-00624-z