Climate of the Past www.clim-past.net 1814-9324 1814-9332 3 1 2007 10.5194/cp-3-89-2007 http://www.clim-past.net/3/89/2007/ http://www.clim-past.net/3/89/2007/cp-3-89-2007.html http://www.clim-past.net/3/89/2007/cp-3-89-2007.pdf 89 95 2007-02-07 Summer temperature trend over the past two millennia using air content in Himalayan ice S. Hou shugui@lzb.ac.cn J. Chappellaz J. Jouzel P. C. Chu V. Masson-Delmotte D. Qin D. Raynaud P. A. Mayewski V. Y. Lipenkov S. Kang Lab. de Glaciologie et Geophysique de l'Environnement (CNRS-UJF), 54 rue Molière, Domaine Univ., BP 96, 38402 St Martin d'Hères, France IPSL-Lab. des Sciences du Climat et de l'Environnement (CEA-CNRS-UVSQ), CE Saclay, Annexe Orme des Merisiers, 91191 Gif-sur-Yvette, France Lab. of Cryosphere and Environment, Chinese Academy of Sciences, 260 Donggang West Road, 730000 Lanzhou, China Naval Ocean-Atmosphere Prediction Lab., Dept. of Oceanography, Naval Postgraduate School, Monterey, CA 93943, USA Climate Change Institute (CCI), Univ. of Maine, Orono, ME 04469, USA Arctic and Antarctic Research Institute, Beringa Street 38, 199397, St. Petersburg, Russia Two Himalayan ice cores display a factor-two decreasing trend of air content over the past two millennia, in contrast to the relatively stable values in Greenland and Antarctica ice cores over the same period. 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