An asymmetric mode of tropical Indian Ocean rainfall variability in boreal spring

Renguang Wu, Benjamin Kirtman, V. Krishnamurthy

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

An analysis of observational estimates has revealed an asymmetric mode of boreal spring rainfall and wind variability over the tropical Indian Ocean. The asymmetric mode is characterized by opposite rainfall and surface wind anomalies north and south of the equator. This mode is associated with a cross-equatorial gradient in sea surface temperature anomalies. The evolution of this mode is related to air-sea interactions in the tropical Indian Ocean. In particular, surface heat fluxes play an important role in the initiation, development, and decay of this mode. The occurrence of this mode in observations is closely linked to both El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole mode. Coupled general circulation model experiments indicate that this mode can occur in the absence of ENSO. The variability associated with this mode enhances ENSO's teleconnection to the Indian Ocean and affects the seasonal transition in the tropical Indian Ocean.

Original languageEnglish (US)
Article numberD05104
JournalJournal of Geophysical Research C: Oceans
Volume113
Issue number5
DOIs
StatePublished - Mar 16 2008
Externally publishedYes

Fingerprint

Springs (water)
Indian Ocean
Rain
rainfall
Southern Oscillation
air-sea interaction
Heat flux
teleconnection
surface wind
temperature anomaly
El Nino-Southern Oscillation
heat flux
general circulation model
sea surface temperature
Air
anomaly
air water interactions
anomalies
Experiments
equators

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

An asymmetric mode of tropical Indian Ocean rainfall variability in boreal spring. / Wu, Renguang; Kirtman, Benjamin; Krishnamurthy, V.

In: Journal of Geophysical Research C: Oceans, Vol. 113, No. 5, D05104, 16.03.2008.

Research output: Contribution to journalArticle

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