Journal of Marine Sciences ›› 2017, Vol. 35 ›› Issue (3): 9-19.DOI: 10.3969/j.issn.1001-909X.2017.03.002

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Effect of COSMIC occultation data assimilation on prediction of typhoon Usagi

ZOU Yi-hang1, MA Xu-lin2, JIANG Sheng2,3, HE Hai-lun1, GUO Huan2   

  1. 1. Second Institute of Oceanography, SOA, Hangzhou 310012, China;
    2. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    3. Zhejiang Meteorological Observatory, Hangzhou 310017, China
  • Received:2016-12-26 Revised:2017-03-01 Published:2022-11-18

Abstract: A key factor of numerical typhoon prediction models is the initial field. COSMIC(Constellation Observation System of Meteorology, Ionosphere and Climate) satellite data assimilation was used to improve the initial condition, and its effect on improving tropical storms(or typhoon) prediction was evaluated. Employing the GRAPES(Global/Regional Assimilation and Prediction System)which was developed independently by China, typhoon Usagi(1319) was simulated. Analyses are made based on the various outputs, such as temperature, humidity, vorticity, divergence and pseudo-equivalent temperature. The results show that COSMIC data, comparing to the radiosonde data, can enhance the ability of typhoon path and precipitation forecast assimilation. So this research indicates that assimilation of satellite data contributes to the improvement of GRAPES model as well as provides an example on preventing typhoon disasters and reducing damages.

Key words: typhoon numerical simulation, GRAPES model, data assimilation, COSMIC occultation data

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