Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 5 5 2009 10.5194/cpd-5-2351-2009 http://www.clim-past-discuss.net/5/2351/2009/ http://www.clim-past-discuss.net/5/2351/2009/cpd-5-2351-2009.html http://www.clim-past-discuss.net/5/2351/2009/cpd-5-2351-2009.pdf 2351 2389 2009-10-21 Contribution of oceanic and vegetation feedbacks to Holocene climate change in Central and Eastern Asia A. Dallmeyer anne.dallmeyer@zmaw.de M. Claussen J. Otto Max Planck Institute for Meteorology, Hamburg, Germany Meteorological Institute, Klima Campus, University Hamburg, Germany International Max-Planck-Research School, Hamburg, Germany The impact of vegetation-atmosphere and ocean-atmosphere interactions on the mid- to late Holocene climate change as well as their synergy is studied for different regions in Central and Eastern Asia (60–140° E, 0–55° N), giving consideration to the large climatic and topographical heterogeneity in that area. With main focus on the Asian monsoon, we concentrate on both, temperature and precipitation changes. For our purpose, we analyze a set of coupled numerical experiments, performed with the Earth system model ECHAM5/JSBACH-MPIOM under present-day and mid-Holocene (6 k) orbital configurations (Otto et al., 2009). Like expected, the temperature change caused by the insolation forcing reveals an enhanced seasonal cycle, with a pronounced warming in summer (0.7 K) and autumn (1 K) and a cooling in the other seasons (spring: −0.8 K; winter −0.5 K). Most of this change can be attributed to the direct response of the atmosphere, but the ocean, whose reaction has a lagged seasonal cycle (warming in autumn and winter, cooling in the other seasons), strongly modifies the signal. The simulated contribution of dynamic vegetation is small and most effective in winter, where it slightly warms the near-surface atmosphere (≈0.05 K). 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