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

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