A hybrid coupled tropical atmosphere ocean model: Sensitivities and hindcast skill

Kleemann, Richard, Latif, Mojib and Flügel, Moritz (1992) A hybrid coupled tropical atmosphere ocean model: Sensitivities and hindcast skill MPI-Report, 76 . Max-Planck-Institut für Meteorologie, Hamburg, Germany.

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Abstract

The behavior of a hybrid coupled model consisting of a simple atmospheric model and a tropical Pacific ocean general circulation model is examined. The atmosphere is a Gill type dynamical model forced by latent heating determined from a moisture equation. The model is shown to oscillate for suitable choices of the coupled strength and this oscillatory behavior is analyzed with a view to determining mechanisms. Evidence is presented that the phase reversal from warm to cold involves the formation of a 'dipole pattern' of opposite signed sea surface temperature between the eastern and central Pacific. The cold eastern water is then advected westward causing the termination of the 'warm event'. Central to the formation of the dipole pattern in the coupled oscillation, is the strong local oceanic response to easterly atmospheric anomalies in the eastern Pacific and weak remote response there to strong central Pacific westerlies. The model is examined for forecast skill using a large ensemble of two year hindcasts. The relationship between this skill and the mechanisms elucidated in the oscillatory case is discussed.

Document Type: Book
Keywords: Meteorology; Climatology; AIR WATER INTERACTIONS, ATMOSPHERIC MODELS, OCEAN MODELS, PACIFIC OCEAN, TROPICAL REGIONS, WATER CIRCULATION, ADVECTION, FORECASTING, LATENT HEAT, MATHEMATICAL MODELS, OCEAN CURRENTS, RESPONSES, SEA SURFACE TEMPERATURE
ISSN: 0937-1060
Date Deposited: 22 Feb 2012 13:05
Last Modified: 22 Feb 2012 13:05
URI: http://eprints.uni-kiel.de/id/eprint/13772

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