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Modulation of Clouds and Rainfall by Tropical Cyclone's Cold Wakes
Author(s) -
Ma Zhanhong,
Fei Jianfang,
Lin Yanluan,
Huang Xiaogang
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl088873
Subject(s) - anomaly (physics) , tropical cyclone , climatology , environmental science , atmosphere (unit) , atmospheric sciences , cyclone (programming language) , convection , sea surface temperature , geology , meteorology , physics , condensed matter physics , field programmable gate array , computer science , computer hardware
Tropical cyclones can pump heat into the ocean by producing a long‐lasting subsurface warm anomaly while leaving a relatively short‐term surface cold anomaly via mixing the upper ocean. Although the heat pumping has been found to be crucial in driving oceanic heat transport and thereby regulating climate changes, the contribution of surface cold anomaly to the atmosphere remains unclear. Here we show that local clouds and rainfall are effectively modulated by cold wakes left behind by tropical cyclones using a combination of satellite observations. On average, the negative surface enthalpy flux anomaly associated with the cold wake results in a reduction of rainfall by ~16.6 ± 0.6% (standard error) and a decline of cloud fraction by ~6.7 ± 0.4% over the wake region. Clouds and rainfall tend to be more suppressed for slower moving or stronger TCs. With more intense or slower moving TCs in a warming climate, such a modulation could be amplified accordingly.