06.08.2012: FB1-Seminar

11:00 h, Hörsaal (West)

Abstract:

Multi-paleoclimate proxy records show variable trends in boreal summer precipitation during the Holocene in the Indian and East Asian summer monsoon regions. To investigate the mechanisms behind Holocene climatic change and the evolution of Asian summer monsoon, equilibrium simulations for time slices of 9.5 ka BP and 0 ka BP as well as transient simulation from 9.5 ka BP to 0 ka BP were performed by the Kiel climate model (KCM). The transient simulation tests the response of climate change in Asian summer monsoon area to changes in orbital parameters in terms of eccentricity, obliquity and precession. Model results show regional different precipitation patterns in the Indian and East Asian summer monsoon regions during the Holocene. A shifting of the Asian summer precipitation belt during the Holocene is closely related to the south/northward movement of the Inter-tropical convergence zone (ITCZ), which resulted from the response of a coupled tropical and subtropical monsoon system to the orbitally forced change in insolation.