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On the asymmetric distribution of shear-relative typhoon rainfall

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Abstract

The Tropical Rainfall Measuring Mission (TRMM) 3B42 precipitation, the National Centers for Environmental Prediction (NCEP) Final analysis and the Regional Specialized Meteorological Center (RSMC) Tokyo best-track data during 2000–2015 are used to compare spatial rainfall distribution associated with Northwest Pacific tropical cyclones (TCs) with different vertical wind shear directions and investigate possible mechanisms. Results show that the maximum TC rainfall are all located in the downshear left quadrant regardless of shear direction, and TCs with easterly shear have greater magnitudes of rainfall than those with westerly shear, consistent with previous studies. Rainfall amount of a TC is related to its relative position and proximity from the western Pacific subtropical high (WPSH) and the intensity of water vapor transport, and low-level jet is favorable for water vapor transport. The maximum of vertically integrated moisture flux convergence (MFC) are located on the downshear side regardless of shear direction, and the contribution of wind convergence to the total MFC is far larger than that of moisture advection. The cyclonic displacement of the maximum rainfall relative to the maximum MFC is possibly due to advection of hydrometeors by low- and middle-level cyclonic circulation of TCs. The relationship between TC rainfall and the WPSH through water vapor transport and vertical wind shear implies that TC rainfall may be highly predictable given the high predictability of the WPSH.

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Acknowledgements

TRMM 3B42 product is obtained from the National Aeronautics and Space Administration (NASA) Goddard Earth Sciences Data and Information Services Center (GES DISC) of the USA. TC best-track data are provided by RMSC Tokyo - Typhoon Center. NCEP FNL data are provided by the National Center for Atmospheric Research of the USA at http://rda.ucar.edu/datasets/ds083.2/. The authors are grateful to two anonymous reviewers for their constructive comments and helpful suggestions. This work is jointly supported by China National 973 project (2015CB453200), National Natural Science Foundation of China (41505035, 41575078, 41630423), Non-profit Industry Financial Program of MWR of China (201301066, 201401027), Jiangsu Shuangchuang Doctor and Shuangchuang Team Programs, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). This paper is Earth System Modelling Center Contribution No. 139.

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Correspondence to Si Gao.

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Responsible Editor: M. Kaplan.

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Gao, S., Zhai, S., Li, T. et al. On the asymmetric distribution of shear-relative typhoon rainfall. Meteorol Atmos Phys 130, 11–22 (2018). https://doi.org/10.1007/s00703-016-0499-0

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  • DOI: https://doi.org/10.1007/s00703-016-0499-0

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