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A NUMERICAL STUDY OF THE INFLUENCE OF SEA SURFACE TEMPERATURES WITH DIFFERENT TEMPORAL RESOLUTIONS ON typhoon dujuan OVER THE SOUTH CHINA SEA

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Journal of Tropical Meteorology 2010年第2期16卷 195-200页

作者：陈颖珺谢强蒙伟光袁金南王东晓 Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou Institute of Tropical and Marine Meteorology CMA

Daily and weekly sea surface temperature data of Tropical Rainfall Measuring Mission (TRMM) Microwave Imager and Advanced Microwave Scanning Radiometer-Earth Observing System sensors are used as forcing of the underlying sea surface in the mesoscale numerical model to simulate typhoon dujuan that moved across the South China Sea in 2003. The numerical results show that different SSTs near the typhoon center result in differences in the atmospheric wind field, indicating that the model has a fast and obvious response to SSTs. Different SST influences the intensity and track of dujuan to some degree and has significant impacts on its precipitation and latent heat flux near the eye. The SST influence on dujuan is mainly fulfilled by changing the latent heat flux between the ocean surface and the atmosphere above.

关键词： mesoscale numerical models typhoon dujuan sea surface temperature South China Sea

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The Effect of Three-Dimensional Variational Data Assimilation of QuikSCAT Data on the Numerical Simulation of typhoon Track and Intensity

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Advances in Atmospheric Sciences 2005年第4期22卷 534-544页

作者：曾智华端义宏梁旭东马雷鸣 Johnny Chung-leung CHAN 陈仲良 Shanghai typhoon Institute Shanghai 200030 Shanghai typhoon Institute Shanghai 200030 Department of Physics and Materials Science City University of Hong Kong Hong Kong

In this paper, the three-dimensional variational data assimilation scheme (3DVAR) in the mesoscale model version 5 (MM5) of the US Pennsylvania State University/National Center for Atmospheric Research is used to study the effect of assimilating the sea-wind data from QuikSCAT on the prediction of typhoon track and intensity. The case of typhoon dujuan (2003) is first tested and the results show appreciable improvements. Twelve other cases in 2003 are then evaluated. The assimilation of the QuikSCAT data produces significant impacts on the structure of dujuan in terms of the horizontal and vertical winds, sea-level pressure and temperature at the initial time. With the assimilation, the 24-h (48-h) track prediction of 11 (10) out of the 12 typhoons is improved. The 24-h (48-h) prediction of typhoon intensity is also improved in 10 (9) of the 12 cases. These experiments therefore demonstrate that assimilation of the QuikSCAT sea-wind data can increase the accuracy of typhoon track and intensity predictions through modification of the initial fields associated with the typhoon.

关键词： QuikSCAT MM5 3DVAR numerical simulation typhoon dujuan

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