The role of the tropical Indian Ocean in global climate [Elektronische Ressource] / vorgelegt von Jürgen Bader

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The Role of the Tropical Indian Ocean inGlobal ClimateDissertationzur Erlangung des Doktorgradesder Naturwissenschaften im FachbereichGeowissenschaftender Universitat Hamburgvorgelegt vonJurgen Baderaus Osnabruc kHamburg2005Als Dissertation angenommen vom Fachbereich Geowissenschaftender Universit at Hamburgauf Grund der Gutachten von Professor Dr. Hartmut Gra lund Dr. Mojib LatifHamburg, den 02.02.2005Prof. Dr. SchleicherDekandes Fachbereichs GeowissenschaftenAbstractAmong the most striking decadal climatic trends of the last century are thestrengthening of the NAO index and the decreasing summer monsoon rainfallover sub-Saharan West Africa.This thesis focuses on the role of tropical sea surface temperatures (SSTs)driving theses changes. Both of these changes are investigated by conduct-ing experiments with the atmospheric general circulation model ECHAM4.5{ run in stand-alone mode { and the global ocean-atmosphere-sea ice modelMPI-OM/ECHAM5.These experiments provide evidence that the Indian Ocean warming in thelast decades is of paramount importance in driving the recent observed dryingtrend over the West Sahel. The model West Sahel dried more when tropicalseas were warmer during the past half-century than when they were cooler.When sea surface temperatures were changed in one ocean basin at a time,it was the tropical Indian Ocean that dominated.

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• Published by: universitat_hamburg
• Published: 01 January 2005
• Reads: 3
• Language: English
• Document size: 4 MB

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