Partitioning of the Seasonal Simulation of a Monsoon Climate

T. N. Krishnamurti Department of Meteorology, The Florida State University, Tallahassee, Florida

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H. S. Bedi Department of Meteorology, The Florida State University, Tallahassee, Florida

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G. D. Rohaly Department of Meteorology, The Florida State University, Tallahassee, Florida

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D. Oosterhof Department of Meteorology, The Florida State University, Tallahassee, Florida

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Abstract

The emphasis of this paper is on residue-free budgets of seasonal climate forecasts. It is possible to ask the following question: given a seasonal mean geopotential height simulation from a climate model, what is a breakdown of that contribution from different areas of the model physics and dynamics? In that context, the authors have examined the maintenance of a monsoonal 500-mb ridge, the eastward shift of the Tibetan anticyclone during an El Nin˜o year, and the Pacific-North American pattern. The salient results of this study include a substantial contribution from the advective nonlinear dynamics toward the maintenance (positive or negative) of the seasonal climate.

Abstract

The emphasis of this paper is on residue-free budgets of seasonal climate forecasts. It is possible to ask the following question: given a seasonal mean geopotential height simulation from a climate model, what is a breakdown of that contribution from different areas of the model physics and dynamics? In that context, the authors have examined the maintenance of a monsoonal 500-mb ridge, the eastward shift of the Tibetan anticyclone during an El Nin˜o year, and the Pacific-North American pattern. The salient results of this study include a substantial contribution from the advective nonlinear dynamics toward the maintenance (positive or negative) of the seasonal climate.

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