A Method for Diagnosing the Secondary Circulation with Saturated Moist Entropy Structure in a Mature Tropical Cyclone

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英文篇名：A Method for Diagnosing the Secondary Circulation with Saturated Moist Entropy Structure in a Mature Tropical Cyclone 作者：Yiwu ; HUANG ; Yihong ; DUAN ; Johnny ; C.L.CHAN ; Xuwei ; BAO 英文作者：Yiwu HUANG;Yihong DUAN;Johnny C.L.CHAN;Xuwei BAO;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences;University of Chinese Academy of Science;National Meteorological Center China Meteorological Administration;School of Energy and Environment, City University of Hong Kong;Shanghai Typhoon Institute,China Meteorological Administration; 英文关键词：tropical cyclone;;saturated moist entropy structure;;secondary circulation;;diagnosis method 中文刊名：DQJZ 英文刊名：大气科学进展(英文版) 机构：State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences;University of Chinese Academy of Science;National Meteorological Center China Meteorological Administration;School of Energy and Environment, City University of Hong Kong;Shanghai Typhoon Institute,China Meteorological Administration; 出版日期：2019-07-11 出版单位：Advances in Atmospheric Sciences 年：2019 期：v.36 基金：funded in part by the National Basic Research and Development (973) Program of China (Grant No. 2015CB452805);; in part by the National Natural Science Foundation of China (Grant No. 41775064);; the Basic Research Fund of CAMS (2016Z003);; supported by the Research Grants Council of the Hong Kong Special Administrative Region of China (Grant No. CityU11301417) 语种：英文; 页：DQJZ201908004 页数：7 CN：08 ISSN：11-1925/O4 分类号：36-42

摘要

Under the adiabatic, axisymmetric and steady assumption, a relationship between the saturated moist entropy structure and the secondary circulation in a tropical cyclone(TC) is derived from the continuity equation. It is found that the isentropic surfaces coincide with the streamlines, and the streamfunction can be expressed with saturated moist entropy. The secondary circulation and the saturated moist entropy structure depend on each other. Thus, a method for diagnosing the secondary circulation with the structure of saturated moist entropy is proposed. The method is verified with a simulated intense idealized TC with a highly axisymmetric structure. The diagnosed secondary circulation reproduces well the moist inflow in the boundary layer and the moist updraft in the eyewall. This method facilitates secondary circulation diagnosis in theoretical or mature TCs that satisfy the adiabatic, axisymmetric and steady approximations.
        Under the adiabatic, axisymmetric and steady assumption, a relationship between the saturated moist entropy structure and the secondary circulation in a tropical cyclone(TC) is derived from the continuity equation. It is found that the isentropic surfaces coincide with the streamlines, and the streamfunction can be expressed with saturated moist entropy. The secondary circulation and the saturated moist entropy structure depend on each other. Thus, a method for diagnosing the secondary circulation with the structure of saturated moist entropy is proposed. The method is verified with a simulated intense idealized TC with a highly axisymmetric structure. The diagnosed secondary circulation reproduces well the moist inflow in the boundary layer and the moist updraft in the eyewall. This method facilitates secondary circulation diagnosis in theoretical or mature TCs that satisfy the adiabatic, axisymmetric and steady approximations.

引文

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