Modulation of south asian jet wave train on the extreme winter precipitation over southeast China: Comparison between 2015/16 and 2018/19

L. I. Xiuzhen, W. E.N. Zhiping, Wan Ru Huang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Two extremely wet winters in 2015/16 and 2018/19 over Southeast China are compared in this study. South-to-north discrepancies appear in the spatial distribution of precipitation, with anomalous precipitation centered over the southeast coast in 2015/16 and the lower reaches of Yangtze River valley in 2018/19, respectively. Both instances of enhanced precipitation are ascribed mainly to warm and moist advection from the south, with transport in 2015/16 partly by a deepened India-Burma trough to the west, whereas with transport in 2018/19 mainly by a subtropical western North Pacific anticyclone (WNPAC). Both the India-Burma trough and WNPAC are maintained by the wave trains propagating along the South Asian jet, which are zonally offset by a quarter-wavelength. Further study of the wave train sources in 2015/16 and 2018/19 shows that they both tend to originate from extremely strong storm-track activity over the North Atlantic but have different displacement. The former is located more northeastward than the mean storm track and is modulated by a strong positive NAO, whereas the latter lies over the midlatitude central North Atlantic along with a circumglobal teleconnection. These differences further result in a quarter-wavelength offset in the Rossby wave source near the entrance of the South Asian jet by the convergence of upper-level divergent wind.

    Original languageEnglish
    Pages (from-to)4065-4081
    Number of pages17
    JournalJournal of Climate
    Volume33
    Issue number10
    DOIs
    Publication statusPublished - 2020 May 15

    ASJC Scopus subject areas

    • Atmospheric Science

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