Precipitation anomalies in the tropical Indian Ocean and their relation to the initiation of El Niño

Details Precipitation anomalies in the tropical Indian Ocean and their relation to the initiation of El Niño Precipitation anomalies in the tropical Indian Ocean and their relation to the initiation of El Niño

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..83c&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 10, pp. 83-1, CiteID 1441, DOI 10.1029/2001GL013399

Physics

2

Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Precipitation (1854), Oceanography: Physical: El Nino, Information Related To Geographic Region: Indian Ocean

Scientific paper

A pattern of intraseasonal to interannual variability in precipitation and surface winds for the eastern equatorial Indian Ocean (EEIO) during 1979 to 1999 is described using combined Empirical Orthogonal Function (EOF) analyses. The main features of the positive phase of the EEIO mode are 1) enhanced precipitation to the south of the island of Sumatra, 2) suppressed precipitation in the central equatorial Indian Ocean, 3) surface westerly wind anomalies directed from the dry toward the wet region, and 4) southeasterly wind anomalies which meet the westerly anomalies in the vicinity of the enhanced precipitation. A relationship was found between the precipitation gradient of the EEIO mode and the five strongest El Niño events since 1979 (1982/83, 1986/87, 1991/92, 1994/95, and 1997/98). For the cases when the interannual component of the gradient reached a positive peak followed by significant power (94%) in the 30-60 day component of the gradient roughly a season later, an El Niño was observed to develop.

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