Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 3 6 2007 10.5194/cpd-3-1261-2007 http://www.clim-past-discuss.net/3/1261/2007/ http://www.clim-past-discuss.net/3/1261/2007/cpd-3-1261-2007.html http://www.clim-past-discuss.net/3/1261/2007/cpd-3-1261-2007.pdf 1261 1282 2007-11-26 Modeling a strong East Asian summer monsoon in a globally cool Earth, the MIS-13 case Q. Z. Yin yin@astr.ucl.ac.be A. Berger E. Driesschaert H. Goosse M. F. Loutre M. Crucifix Institut d'Astronomie et de Géophysique G. Lemaître, Université catholique de Louvain, Chemin du Cyclotron 2, 1348 Louvain-la-Neuve, Belgium Deep-sea and ice-core records show a significant reduced amplitude of the ice volume, temperature and greenhouse gases variations before Marine Isotope Stage (MIS) 11, about 400 000 years ago, with less warm (more glaciated) interglacials and less cold glacials. At the same time, the loess in northern China, the sedimentary core in the eastern Tibetan Plateau and the palaeosols in southern China all record an unusually warm and wet climate during MIS-13 (about 500 000 years ago), indicating an extremely strong East Asian summer monsoon. To understand this seeming paradox of a strong East Asian summer monsoon occurring during the cool MIS-13, a three-dimension Earth system Model of Intermediate complexity is used. Modeling results show that this very strong MIS-13 East Asian summer monsoon, identified from the precipitation, horizontal and vertical (omega) wind, and pressure (geopotential) fields, results from the astronomical and ice sheet forcings. North Hemisphere summer at perihelion both at 529 and 506 ka BP leads to an East Asian summer monsoon stronger than during the Pre-Industrial time. 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