Clustering of synoptic activity by Indian summer monsoon intraseasonal oscillations

B. N. Goswami, Ajaya Ravindran, Prince K. Xavier, D. Sengupta

    Research output: Contribution to journalArticle

    Abstract

    Active and break phases of the Indian summer monsoon are characterized by enhancement and decrease of precipitation over the monsoon trough region. Using genesis data of monsoon low pressure systems (LPS) and circulation data for the period 1954 to 1993, it is shown that the frequency of occurrence of LPS is nearly 3.5 times higher in the active phase of monsoon as compared to the break phase. In addition, the tracks of these synoptic systems are also strongly spatially clustered along the monsoon trough during the active phase of the monsoon. The enhanced (decreased) frequency of occurrence of LPS during active (break) phases is due to modulation of meridional shear of zonal winds and cyclonic vorticity along the monsoon trough by the intraseasonal oscillations (ISO).

    Original languageEnglish (US)
    JournalGeophysical Research Letters
    Volume30
    Issue number8
    DOIs
    StatePublished - Apr 15 2003

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    intraseasonal variations
    monsoons
    summer
    monsoon
    oscillation
    low pressure system
    troughs
    trough
    low pressure
    occurrences
    zonal wind
    vorticity
    shear
    modulation
    augmentation

    ASJC Scopus subject areas

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

    Clustering of synoptic activity by Indian summer monsoon intraseasonal oscillations. / Goswami, B. N.; Ravindran, Ajaya; Xavier, Prince K.; Sengupta, D.

    In: Geophysical Research Letters, Vol. 30, No. 8, 15.04.2003.

    Research output: Contribution to journalArticle

    Goswami, B. N. ; Ravindran, Ajaya ; Xavier, Prince K. ; Sengupta, D. / Clustering of synoptic activity by Indian summer monsoon intraseasonal oscillations. In: Geophysical Research Letters. 2003 ; Vol. 30, No. 8.
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