Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 2 6 2006 10.5194/cpd-2-1293-2006 http://www.clim-past-discuss.net/2/1293/2006/ http://www.clim-past-discuss.net/2/1293/2006/cpd-2-1293-2006.html http://www.clim-past-discuss.net/2/1293/2006/cpd-2-1293-2006.pdf 1293 1346 2006-12-13 Coupled simulations of the mid-Holocene and Last Glacial Maximum: new results from PMIP2 P. Braconnot pascale.braconnot@cea.fr B. Otto-Bliesner S. Harrison S. Joussaume J.-Y. Peterchmitt A. Abe-Ouchi M. Crucifix T. Fichefet C. D. Hewitt M. Kageyama A. Kitoh M.-F. Loutre O. Marti U. Merkel G. Ramstein P. Valdes L. Weber Y. Yu Y. Zhao Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte CEA-CNRS-UVSQ, Orme des Merisiers, bât. 712, 91191 Gif-sur-Yvette Cedex, France National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, Colorado, USA School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, UK Center for climate System Research, The Univ. of Tokyo, Japan 277-8568 and FRCGC/JAMSTEC, Yokohama, 236-0001 Japan Met Office Hadley Centre, Fitzroy Road, Exeter EX1 3PB, UK Université Catholique de Louvain, Institut d'Astronomie et de Géophysique Georges Lemaître, 1348 Louvain-la-Neuve, Belgium Meteorological Research Institute, Tsukuba, Ibaraki 305-0052, Japan Univ. Bremen, FB5 Geosciences, Geosystem modelling, P.O. Box 330 440, 28334 Bremen, Germany Royal Netherlands Meteorological Institute, PO Box 201, 3730 AE De Bilt, The Netherlands LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 9804, Beijing 100029, P.R. China A set of coupled ocean-atmosphere simulations using state of the art climate models is now available for the Last Glacial Maximum and the mid-Holocene through the second phase of the Paleoclimate Modeling Intercomparison Project (PMIP2). This study presents the large scale features of the simulated climates and compares the new model results to those of the atmospheric models from the first phase of the PMIP, for which sea surface temperature was prescribed or computed using simple slab ocean formulations. We consider first the large scale features of the climate change, pointing out some of the major differences between the different sets of experiments. Then we quantify the latitudinal shift of the location of the ITCZ in the tropical regions during boreal summer. It is shown that this shift is limited for LGM, whereas a northward shift and an increase of precipitation are well depicted for mid-Holocene in continental regions affected by monsoon precipitation. 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