Abstract
Precipitation extremes will generally intensify in response to a warming climate. This robust fingerprint of climate change is of particular concern, resulting in heavy rainfall and devastating floods. Often this intensification is explained as a consequence of the Clausius–Clapeyron law in a warmer world, under constant relative humidity. Here, based on an ensemble of CMIP5 global climate models and high-resolution regional climate simulations, we take the example of Southwest Asia, where extreme storms will intensify beyond the Clausius- Clapeyron scaling, and propose an additional novel mechanism for this region: the unique increase in atmospheric relative humidity over the Arabian Sea and associated deep northward penetration of moisture. This increase in humidity is dictated by changes in circulation over the Indian Ocean. Our proposed mechanism is consistent with the recent, most extreme storm ever observed in the region. Our findings advance a new understanding of natural climate variability in this region, with substantial implications for climate change adaptation of the region’s critical infrastructure.
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Acknowledgements
Research performed under Research Collaboration Agreement between Kuwait University and Massachusetts Institute of Technology (MIT), and funded by Kuwait Foundation for the advancement of science under project code: P216-45EV01. We acknowledge the World Climate Research Programme’s Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modeling groups for producing and making available their model output.
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Tuel, A., Choi, YW., AlRukaibi, D. et al. Extreme storms in Southwest Asia (Northern Arabian Peninsula) under current and future climates. Clim Dyn 58, 1509–1524 (2022). https://doi.org/10.1007/s00382-021-05975-7
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DOI: https://doi.org/10.1007/s00382-021-05975-7