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Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (2): 188-200.doi: 10.11728/cjss2018.02.188

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Numerical Simulation of Typhoon-generated Gravity Waves Observed by Satellite and its Direct Validationormalsize

YAO Zhigang1,2, HONG Jun3, HAN Zhigang1, ZHAO Zengliang1   

  1. 1. Beijing Institute of Applied Meteorology, Beijing 100029;
    2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;
    3. College of Field Engineering, Army Engineering University, Nanjing 211101
  • Received:2017-01-08 Revised:2017-06-25 Online:2018-03-15 Published:2018-03-09

Abstract:

To analyze the stratospheric gravity waves induced by strong convection, Typhoon Soulik is investigated by the mesoscale model WRF-ARW (3.5 Version), ECMWF and AIRS observations. The WRF model results show that strong stratospheric gravity waves are induced by Typhoon Soulik, and the background wind plays a great role in modulation of the gravity waves propagation. The wave spectrum analysis reveals that the horizontal wavelength is about 500km, the period is about 3~5h, and the vertical wavelengths are gradually stretched with height about 10~14km, 14~18km and 22~26km in the height of 20km, 30km and 40km. The momentum flux and wave drag are also analyzed. At last, the direct comparison of WRF, ECMWF and AIRS observations based on a radiative transfer model indicates that the stratospheric semicircular arc wave pattern, position and horizontal scale agree well. But there are also some differences among these data. The AIRS can detect more details than WRF and ECMWF data. The order of wave intensity is AIRS, WRF and ECMWF.

Key words: Satellite observation, Typhoon, Stratosphere, Gravity wave, Numerical simulation

CLC Number: