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Global increase in tropical cyclone rain rate

Earth Sciences

Global increase in tropical cyclone rain rate

O. Guzman and H. Jiang

This study by Oscar Guzman and Haiyan Jiang uncovers a significant increase in tropical cyclone rainfall rates by about 1.3% per year over a 19-year period. The research highlights how inner-core rainfall rates have decreased while rainband rainfall rates have surged, especially in the Northwestern Pacific and North Atlantic basins, driven by rising sea surface temperatures and total precipitable water.

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Playback language: English
Abstract
Theoretical models suggest that tropical cyclone (TC) rainfall rates should increase in a warmer environment, but observational evidence on a global scale is limited. This study analyzes a 19-year (1998-2016) time series of TC rainfall rates, revealing an overall increase of about 1.3% per year. This increase is primarily due to a reduction in inner-core rainfall rates and a simultaneous increase in rainband rainfall rates. The trend is more pronounced in the Northwestern Pacific and North Atlantic basins and is relatively uniform across all TC intensities. Increases in sea surface temperature and total precipitable water are associated with this trend.
Publisher
Nature Communications
Published On
Sep 09, 2021
Authors
Oscar Guzman, Haiyan Jiang
Tags
tropical cyclones
rainfall rates
climate change
sea surface temperature
precipitable water
Northwestern Pacific
North Atlantic

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