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Structure and formation of convection of secondary rainbands in a simulated typhoon Jangmi (2008)

  • Jing Xiao
  • Zhe-Min Tan
  • Kim-Chiu Chow
Original Paper

Abstract

Secondary rainbands in tropical cyclone are relatively transient compared with the quasi-stationary principle rainbands. To have a better understanding on their convective structure, a cloud-resolving scale numerical simulation of the super typhoon Jangmi (2008) was performed. The results suggest that the convections in secondary rainbands have some distinctive features that may not be seen in other types of rainbands in tropical cyclone. First, they have a front-like structure and are triggered to form above the boundary layer by the convergence of the above-boundary outflow from the inner side (warmer) and the descending inflow (colder) from the outer side. These elevated convections can be further confirmed by the three-dimensional backward trajectory calculations. Second, due to the release in baroclinic energy, the lower portion of the mid-level inflow from outside may penetrate into the bottom of the convection tower and may help accelerate the boundary layer inflow in the inner side. Third, the local maximum tangential wind is concentrated in the updraft region, with a lower portion which is dipping inward. Tangential wind budget analysis also suggests that the maxima are mainly contributed by the updraft advection, and can be advected cyclonically downstream by the tangential advection.

Notes

Acknowledgements

This work was jointly supported by the National Key Research and Development Program of China under Grants 2017YFC1501601, the National Natural Science Foundation of China (41461164008), the National Key Project for Basic Research (973 Project) under Grant 2015CB425803. Constructive comments and feedback from Fang Juan, Qiu Xin, Chu Kekuan, and Gu Jianfeng are greatly appreciated. Thanks to Qiu Xin and Guo Chuanjiang for help with setting up the simulation and maintaining the high-performance computing center at the School of Atmospheric Sciences, Nanjing University.

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© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Mesoscale Severe Weather/MOE, School of Atmospheric SciencesNanjing UniversityNanjingChina
  2. 2.Space Science Institute/Lunar and Planetary Science LaboratoryMacau University of Science and TechnologyMacauChina

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