Abrupt termination of Indian Ocean dipole events in response to intraseasonal disturbances

Details Abrupt termination of Indian Ocean dipole events in response to intraseasonal disturbances Abrupt termination of Indian Ocean dipole events in response to intraseasonal disturbances

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3119306r&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 19, CiteID L19306

Physics

24

Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: General: Equatorial Oceanography, Oceanography: Physical: Upper Ocean Processes

Scientific paper

We have investigated the role of atmospheric intraseasonal disturbances on termination of the Indian Ocean Dipole (IOD) using multiple datasets. We observed significant 30-60 day atmospheric disturbances associated with equatorial westerly zonal winds prior to termination of all IOD events except for the 1982 and 1997 events. The westerlies excite anomalous downwelling Kelvin waves that terminate the basin-wide coupled processes by warming the eastern Indian Ocean. The 1982 and 1997 IOD events coincide with the strongest El Niño events; during those years the intraseasonal disturbances are weak.

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