Effect of COSMIC occultation data assimilation on prediction of typhoon Usagi

ZOU Yi-hang; MA Xu-lin; JIANG Sheng; HE Hai-lun; GUO Huan

doi:10.3969/j.issn.1001-909X.2017.03.002

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

Effect of COSMIC occultation data assimilation on prediction of typhoon Usagi

ZOU Yi-hang¹, MA Xu-lin², JIANG Sheng^2,3, HE Hai-lun¹, GUO Huan²

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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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ZOU Yi-hang, MA Xu-lin, JIANG Sheng, HE Hai-lun, GUO Huan. Effect of COSMIC occultation data assimilation on prediction of typhoon Usagi[J]. Journal of Marine Sciences. 2017, 35(3): 9-19 https://doi.org/10.3969/j.issn.1001-909X.2017.03.002

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