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An Extreme Heat Event Induced by Typhoon Lekima (2019) and Its Contributing Factors
Author(s) -
Zhao Dingchi,
Lin Yanluan,
Li Yuanlong,
Gao Xiaoyu
Publication year - 2021
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2021jd034760
Subject(s) - typhoon , sensible heat , climatology , subsidence , environmental science , weather research and forecasting model , heat flux , meteorology , atmospheric sciences , cyclone (programming language) , heat transfer , geology , geography , mechanics , paleontology , physics , structural basin , field programmable gate array , computer science , computer hardware
As two prominent natural hazards, tropical cyclone (TC) and heat compound events seem irrelevant on most occasions. TC generally leads to cooling, but could induce extreme heat days (EHD) and heat compound hazard under certain circumstances. An EHD along the southeastern coast of China (SECC) associated with Typhoon Lekima (2019) is documented with its major contributing factors. The formation and intensity of the EHD were found to be closely related to the outer circulation of Lekima by comparing a series of WRF simulations. Via a boundary layer heat budget, we found local sensible heat flux was a necessary, but not sufficient condition for this EHD. Aided by a backward trajectory analysis, we found that upstream surface sensible heat flux, subsidence induced by Typhoon Lekima, and foehn effect due to local topography played approximately equal roles to the occurrence of the EHD. The retreat of regional land‐sea breeze circulation was also beneficial to the appearance of the EHD. Such TC‐heat events might be more overwhelming due to more vigorous TCs with warming in the future.