Climate Dynamics

, Volume 13, Issue 4, pp 247–257 | Cite as

Modeling bio-geophysical feedback in the African and Indian monsoon region

  • M. Claussen

Abstract.

 An asynchronously coupled global atmosphere-biome model is used to assess the dynamics of deserts and drought in the Sahel, Saudi-Arabia and the Indian subcontinent. Under present-day conditions of solar irradiation and sea-surface temperatures, the model finds two solutions: the first solution yields the present-day distribution of vegetation and deserts and the second shows a northward spread of savanna and xerophytic shrub of some 600 km, particularly in the southwest Sahara. Comparison of atmospheric states associated with these solutions corroborates Charney’s theory of a self-induction of deserts through albedo enhancement in the Sahel. Over the Indian subcontinent, changes in vegetation are mainly caused by a positive feedback between increased soil moisture and stronger summer monsoon.

Keywords

Soil Moisture Solar Irradiation Positive Feedback Summer Monsoon Atmospheric State 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • M. Claussen
    • 1
  1. 1.Potsdam-Institut für Klimafolgenforschung, P. O. Box 601203, D-14412 Potsdam, GermanyDE

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