On the Role of the Indian Ocean in a Coupled Ocean–Atmosphere Model of El Niño and the Southern Oscillation

David L. T. Anderson Department of atmospheric Physics, Clarendon Laboratory, Oxford University, OX1 3PU, England

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Julian P. McCreary Jr. Nova University Oceanographic Center, Dania, FL 33004

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Abstract

The coupled ocean-atmosphere model of Anderson and McCreary is extended to include two oceans. An advantage of the two-ocean system is that it is not necessary to specify externally convection over land.

For a basin geometry that most resembles the Indian and Pacific Oceans, strong permanent convection exists in the eastern Indian Ocean, and there is an oscillation in the Pacific Ocean with a period of about five years. Associated with this oscillation is a patch of convection that develops in the central and western ocean and propagates into the eastern ocean before dissipating.

Abstract

The coupled ocean-atmosphere model of Anderson and McCreary is extended to include two oceans. An advantage of the two-ocean system is that it is not necessary to specify externally convection over land.

For a basin geometry that most resembles the Indian and Pacific Oceans, strong permanent convection exists in the eastern Indian Ocean, and there is an oscillation in the Pacific Ocean with a period of about five years. Associated with this oscillation is a patch of convection that develops in the central and western ocean and propagates into the eastern ocean before dissipating.

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