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Modulation of tropical cyclogenesis over the South China Sea by ENSO Modoki during boreal summer

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Abstract

This study examines the modulation of tropical cyclogenesis over the South China Sea (SCS) by the El Niño-Southern Oscillation (ENSO) Modoki during the boreal summer. Results reveal that there were more tropical cyclones (TCs) formed over the SCS during central Pacific warming years and less TC frequency during central Pacific cooling years. How different environmental factors (including low-level relative vorticity, mid-level relative humidity, vertical wind shear, and potential intensity) contribute to this influence is investigated, using a genesis potential (GP) index developed by Emanuel and Nolan. Composite anomalies of the GP index are produced for central Pacific warming and cooling years separately, which could account for the changes of TC frequency over the SCS in different ENSO Modoki phases. The degree of contribution by each factor is determined quantitatively by producing composites of modified indices in which only one of the contributing factors varies, with the others set to climatology. The results suggest that the vertical wind shear and low-level relative vorticity, which are associated with the ENSO Modoki-induced anomalous circulations in Matsuno-Gill patterns, make the largest contributions to the ENSO Modoki modulation of tropical cyclogenesis over the SCS as implied by the GP index. These results highlight the important roles of dynamic factors in the modulation of TC frequency over the SCS by the ENSO Modoki during the boreal summer.

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  1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, P. R. China

    Lei Wang

  2. Department of Atmospheric Sciences, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China

    Lei Wang & Zhiliang Guo

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Wang, L., Guo, Z. Modulation of tropical cyclogenesis over the South China Sea by ENSO Modoki during boreal summer. J. Ocean Univ. China 13, 223–235 (2014). https://doi.org/10.1007/s11802-014-2128-1

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  • DOI: https://doi.org/10.1007/s11802-014-2128-1

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