Mechanism for the role of latent heat flux variation on the activities of tropical cyclones in the western North Pacific

BAI Li-na; REN Fu-min; SONG Jin-jie; WANG Yuan; WU Guo-xiong

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BAI Li-na, REN Fu-min, SONG Jin-jie, WANG Yuan, WU Guo-xiong. Mechanism for the role of latent heat flux variation on the activities of tropical cyclones in the western North Pacific[J]. Haiyang Xuebao, 2010, 32(4): 32-40.

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Mechanism for the role of latent heat flux variation on the activities of tropical cyclones in the western North Pacific

1.
Key Laboratory of Mesoscale Severe Weather of Ministry of Education, Nanjing University, Nanjing 210093,China;
2.
National Climate Center, Beijing 100081,China;
3.
LASG, Institute of Atmospheric Physics; Chinese Academy of Sciences, Beijing 100029,China

Received Date: 2009-08-25

Abstract

Abstract

By using tropical cyclone data from China Meteorological Administration (CMA) and the ERA reanalysis data for the period of 1958—2001, a possible mechanism for the role of latent heat flux variation on the activities of TCs in the western North Pacific(WNP, including South China Sea) has been proposed. There exist significant decreasing trends in both the frequency of TCs in WNP(including SCS) and the latent heat flux in the key region-central subtropical North Pacific. Diagnostics suggest that latent heat flux in the key region may through a chain of latent heat flux-westward water vapor transportation at lower troposphere-water vapor converging, ascending and then condensing over the WNP(including SCS)-releasing latent heat-changing the atmospheric environment (including relative humidity in the middle troposphere, vorticity in the upper and lower troposphere, divergence in the upper and lower troposphere)-ultimately control the activities of WNP(including SCS) TCs. Modeling study by using SAMIL model further confirms the diagnostics results above and reveals that the activities of WNP TCs are very sensitive to the ocean-atmospheric interaction in the key region, while the activities of SCS TCs are less sensitive. It can be concluded at least tentatively that during the past more than 40 years the decreasing trend in the latent heat flux in the central subtropical North Pacific is one of the main reasons that cause the decreasing trend in the frequency of TCs in WNP(including SCS).
- latent heat flux,
- tropical cyclone frequency,
- water vapor transportation spectral atmosphere model (SAMIL),

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