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《Meteorology and Disaster Reduction Research》 2018-02
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Impact of Different Scale Component of Cross-equatorial Flow on the Track Deflection of Typhoon Megi(2010)and Its Simulation Test

Guo Xingliang;Huang Shan;Institute of Meteorology and Oceanography NUDT;Troops 32035 of PLA;Weather Station of Troops 94116;  
Based on NCEP reanalysis data and NOAA high resolution SST data,the temporal evolution of cross-equatorial flow strength during the north deflection period of Typhoon Megi(2010)were discussed by using Spatial Fourier filter.The results showed that the northward strengthening of cross-equatorial flow around Kalimantan Island played an important role in the north deflection of typhoon track.The meso-scale anticyclone in the Kalimantan cross-equatorial flow can be reflected obviously by the circulation structure of lower wind component with zonal and meridional wavelength larger than500 km.The meso-scale components in the environmental wind field had an important impact on the north deflection of Megi track,and the wind component with zonal and meridional wavelength lager than 500 km reflected the impact of meso-scale anticyclone in the Kalimantan cross-equatorial flow on the typhoon track,thus the simulation was in good agreement with the observation.
【Fund】: 国家自然基金项目(编号:41275002;41375106)
【CateGory Index】: P444
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