Increase in tropical cyclone rain rate with translation speed

被引：0
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作者：
Shifei Tu
Johnny C. L. Chan
Jianjun Xu
Quanjia Zhong
Wen Zhou
Yu Zhang
机构：
[1] Guangdong Ocean University,China Meteorological Administration
[2] Guangdong Ocean University,Guangdong Ocean University (CMA
[3] Shenzhen Institute of Guangdong Ocean University,GDOU) Joint Laboratory for Marine Meteorology & South China Sea Institute of Marine Meteorology
[4] City University of Hong Kong,College of Ocean and Meteorology
[5] China Meteorological Administration,Low
[6] Asia-Pacific Typhoon Collaborative Research Center,Carbon and Climate Impact Research Centre, School of Energy and Environment
[7] Chinese Academy of Sciences,Shanghai Typhoon Institute
[8] Fudan University,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics
来源：
Nature Communications | / 13卷
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摘要：
In general, tropical cyclone (TC) rainfall accumulation usually decreases with faster TC translation speed but increases with heavier rain rate. However, how the TC rain rate changes with translation speed is unclear. Here we show that, in all TC basins, the average TC rain rate significantly increases with translation speed. On average, the rain rate in a fast-moving TC is 24% higher than in a slow one. This difference increases with TC intensity, with category 3–5 TCs having a 42% increase while tropical depressions exhibit only a 9% increase. The increase in the average TC rain rate with translation speed is mainly caused by the TC net inflow in the lower troposphere, as well as vertical wind shear. These findings have important implications not only for a deeper understanding of rain rate changes in a translating TC but also for short-term forecasts of TC rainfall and disaster preparedness.
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