Recent global decrease in the inner-core rain rate of tropical cyclones

Shifei Tu, Jianjun Xu (), Johnny C. L. Chan, Kian Huang, Feng Xu and Long S. Chiu
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Shifei Tu: South China Sea Institute of Marine Meteorology & College of Ocean and Meteorology, Guangdong Ocean University
Jianjun Xu: South China Sea Institute of Marine Meteorology & College of Ocean and Meteorology, Guangdong Ocean University
Johnny C. L. Chan: School of Energy and Environment, City University of Hong Kong
Kian Huang: South China Sea Institute of Marine Meteorology & College of Ocean and Meteorology, Guangdong Ocean University
Feng Xu: South China Sea Institute of Marine Meteorology & College of Ocean and Meteorology, Guangdong Ocean University
Long S. Chiu: George Mason University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Heavy rainfall is one of the major aspects of tropical cyclones (TC) and can cause substantial damages. Here, we show, based on satellite observational rainfall data and numerical model results, that between 1999 and 2018, the rain rate in the outer region of TCs has been increasing, but it has decreased significantly in the inner-core. Globally, the TC rain rate has increased by 8 ± 4% during this period, which is mainly contributed by an increase in rain rate in the TC outer region due to increasing water vapor availability in the atmosphere with rising surface temperature. On the other hand, the rain rate in the inner-core of TCs has decreased by 24 ± 3% during the same period. The decreasing trend in the inner-core rain rate likely results mainly from an increase in atmospheric stability.

Date: 2021
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DOI: 10.1038/s41467-021-22304-y

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