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The Effect of Typhoon-Induced SST Cooling on Typhoon Intensity: The Case of Typhoon Chanchu (2006)
JIANG Xiaoping,ZHONG Zhong,LIU Chunxia
Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101； Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080;Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101;Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080； Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 51030
Abstract In order to investigate air-sea interactions during the life cycle of typhoons and the quantificational effects of typhoon-induced SST cooling on typhoon intensity, a mesoscale coupled air-sea model is developed based on the non-hydrostatic mesoscale model MM5 and the regional ocean model POM, which is used to simulate the life cycle of Typhoon Chanchu (2006) from a tropical depression to a typhoon followed by a steady weakening. The results show that improved intensity prediction is achieved after considering typhoon-induced SST cooling; the trend of the typhoon intensity change simulated by the coupled model is consistent with observations. The weakening stage of Typhoon Chanchu from 1200 UTC 15 May to 1800 UTC 16 May can be well reproduced, and it is the typhoon-induced SST cooling that makes Chanchu weaken during this period. Analysis reveals that the typhoon-induced SST cooling reduces the sensible and latent heat fluxes from the ocean to the typhoon's vortex, especially in the inner-core region. In this study, the average total heat flux in the inner-core region of the typhoon decrease by 57.2%, whereas typhoon intensity weakens by 46%. It is shown that incorporation of the typhoon-induced cooling, with an average value of 2.17C, causes a 46-hPa weakening of the typhoon, which is about 20 hPa per 1C change in SST.
JIANG Xiaoping,ZHONG Zhong,LIU Chunxia, 2008: The Effect of Typhoon-Induced SST Cooling on Typhoon Intensity: The Case of Typhoon Chanchu (2006) . Adv. Atmos. Sci., 25(6), 1062-1072, doi: 10.1007/s00376-008-1062-9.
