A Statistical Analysis on the E ect of Vertical Wind Shear on Tropical Cyclone Development

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  • Funds:

    Supported by the National Natural Science Foundation of China under Grant Nos. 4995014, 40275018, and 40333025

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  • Using tropical cyclone (TC) best track and intensity of the western North Pacific data from the Joint TyphoonWarning Center (JTWC) of the United States and the NCEP/NCAR reanalysis data for the period of 1992-2002, the effects of vertical wind shear on TC intensity are examined. The samples were limited to the westward or northwestward moving TCs between 5°N and 20°N in order to minimize thermodynamic effects. It is found that the effect of vertical wind shear between 200 and 500 hPa on TC intensity change is larger than that of the shear between 500 and 850 hPa, while similar to that of the shear between 200 and 850 hPa. Vertical wind shear may have a threshold value, which tends to decrease as TC intensifies. As the intensifying rate of TC weakens, the average shear increases. The large shear has the obvious trend of inhibiting TC development. The average shear of TC which can develop into typhoon (tropical depression or tropical storm) is below 7 m s-1 (above 8 m s-1).
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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A Statistical Analysis on the E ect of Vertical Wind Shear on Tropical Cyclone Development

  • 1. Nanjing University of Information Science & Technology,Nanjing 210044 Shanghai Typhoon Institute,Shanghai 200030;
    Shanghai Typhoon Institute,Shanghai 200030;
    Shanghai Typhoon Institute,Shanghai 200030;
    Nanjing University of Information Science & Technology,Nanjing 210044
Funds: Supported by the National Natural Science Foundation of China under Grant Nos. 4995014, 40275018, and 40333025

Abstract: Using tropical cyclone (TC) best track and intensity of the western North Pacific data from the Joint TyphoonWarning Center (JTWC) of the United States and the NCEP/NCAR reanalysis data for the period of 1992-2002, the effects of vertical wind shear on TC intensity are examined. The samples were limited to the westward or northwestward moving TCs between 5°N and 20°N in order to minimize thermodynamic effects. It is found that the effect of vertical wind shear between 200 and 500 hPa on TC intensity change is larger than that of the shear between 500 and 850 hPa, while similar to that of the shear between 200 and 850 hPa. Vertical wind shear may have a threshold value, which tends to decrease as TC intensifies. As the intensifying rate of TC weakens, the average shear increases. The large shear has the obvious trend of inhibiting TC development. The average shear of TC which can develop into typhoon (tropical depression or tropical storm) is below 7 m s-1 (above 8 m s-1).

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