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Simulation of Typhoon Muifa using a mesoscale coupled atmosphere–ocean model
作者姓名:SUN Minghu  DUAN Yihong  ZHU Jianrong  WU Hui  ZHANG Jin  HUANG Wei
作者单位:Chinese Academy of Meteorological Sciences, Beijing 100081, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Meteorological Center, Beijing 100081, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China;State Key Laboratory of Estuary and Coastal, East China Normal University, Shanghai 200062, China;State Key Laboratory of Estuary and Coastal, East China Normal University, Shanghai 200062, China;National Meteorological Center, Beijing 100081, China;Shanghai Typhoon Institute of China Meteorological Administration, Shanghai 200030, China
基金项目:The National Basic Research and Development Program (973 Program) of China under contract No.2009CB421506,the National Natural Science Foundation of China under contract No.40975035,China Meteorological Administration GRAPES Research Fund
摘    要:A mesoscale coupled atmosphere–ocean model has been developed based on the GRAPES(Global and Regional Assimilation and Prediction System) regional typhoon model(GRAPES_TYM) and ECOM-si(estuary, coast and ocean model(semi-implicit)). Coupling between the typhoon and ocean models was conducted by exchanging wind stress, heat, moisture fluxes, and sea surface temperatures(SSTs) using the coupler OASIS3.0. Numerical prediction experiments were run with and without coupling for the case of Typhoon Muifa in the western North Pacific. To investigate the impact of using more accurate SST information on the simulation of the track and the intensity of Typhoon Muifa, experiments were also conducted using increased SST resolution in the initial condition field of the control test. The results indicate that increasing SST resolution in the initial condition field somewhat improved the intensity forecast, and use of the coupled model improved the intensity forecast significantly, with mean absolute errors in maximum wind speed within 48 and 72 h reduced by 32% and 20%, respectively. Use of the coupled model also resulted in less pronounced over-prediction of the intensity of Typhoon Muifa by the GRAPES_TYM. Moreover, the effects of using the coupled model on the intensity varied throughout the different stages of the development of Muifa owing to changes in the oceanic mixed layer depth. The coupled model had pronounced effects during the later stage of Muifa but had no obvious effects during the earlier stage. The SSTs predicted by the coupled model decreased by about 5–6°C at most after the typhoon passed, in agreement with satellite data. Furthermore, based on analysis on the sea surface heat flux, wet static energy of the boundary layer, atmospheric temperature, and precipitation forecasted by the coupled model and the control test, the simulation results of this coupled atmosphere–ocean model can be considered to reasonably reflect the primary mechanisms underlying the interactions between tropical cyclones and oceans.

关 键 词:耦合器  梅花  台风  中尺度  强度预测  海洋模式  耦合模式  仿真
收稿时间:2013/3/25 0:00:00
修稿时间:2013/10/23 0:00:00

Simulation of Typhoon Muifa using a mesoscale coupled atmosphere-ocean model
SUN Minghu,DUAN Yihong,ZHU Jianrong,WU Hui,ZHANG Jin,HUANG Wei.Simulation of Typhoon Muifa using a mesoscale coupled atmosphere-ocean model[J].Acta Oceanologica Sinica,2014,33(11):123-133.
Authors:SUN Minghu  DUAN Yihong  ZHU Jianrong  WU Hui  ZHANG Jin and HUANG Wei
Institution:1.Chinese Academy of Meteorological Sciences, Beijing 100081, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Meteorological Center, Beijing 100081, China2.Chinese Academy of Meteorological Sciences, Beijing 100081, China3.State Key Laboratory of Estuary and Coastal, East China Normal University, Shanghai 200062, China4.National Meteorological Center, Beijing 100081, China5.Shanghai Typhoon Institute of China Meteorological Administration, Shanghai 200030, China
Abstract:A mesoscale coupled atmosphere-ocean model has been developed based on the GRAPES (Global and Regional Assimilation and Prediction System) regional typhoon model (GRAPES_TYM) and ECOM-si (estuary, coast and ocean model (semi-implicit)). Coupling between the typhoon and ocean models was conducted by exchanging wind stress, heat, moisture fluxes, and sea surface temperatures (SSTs) using the coupler OASIS3.0. Numerical prediction experiments were run with and without coupling for the case of Typhoon Muifa in the western North Pacific. To investigate the impact of using more accurate SST information on the simulation of the track and the intensity of Typhoon Muifa, experiments were also conducted using increased SST resolution in the initial condition field of the control test. The results indicate that increasing SST resolution in the initial condition field somewhat improved the intensity forecast, and use of the coupled model improved the intensity forecast significantly, with mean absolute errors in maximum wind speed within 48 and 72 h reduced by 32% and 20%, respectively. Use of the coupled model also resulted in less pronounced over-prediction of the intensity of Typhoon Muifa by the GRAPES_TYM. Moreover, the effects of using the coupled model on the intensity varied throughout the different stages of the development of Muifa owing to changes in the oceanic mixed layer depth. The coupled model had pronounced effects during the later stage of Muifa but had no obvious effects during the earlier stage. The SSTs predicted by the coupled model decreased by about 5–6°C at most after the typhoon passed, in agreement with satellite data. Furthermore, based on analysis on the sea surface heat flux, wet static energy of the boundary layer, atmospheric temperature, and precipitation forecasted by the coupled model and the control test, the simulation results of this coupled atmosphere-ocean model can be considered to reasonably reflect the primary mechanisms underlying the interactions between tropical cyclones and oceans.
Keywords:coupled atmosphere-ocean model  GRAPES  ECOM-si  TC intensity  SST
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