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Ján Veizer (born June 22, 1941) is the Distinguished University Professor (emeritus) of Earth Sciences at the University of Ottawa and Institute for Geology, Mineralogy und Geophysis, of Bochum Ruhr University. He held the NSERC/Noranda/CIFAR Industrial Chair in Earth System Isotope and Environmental Geochemistry until 2004. He is an award-winning isotope geochemist; his research interests have included the use of chemical and isotopic techniques in determining Earth's climatic and environmental history.〔(NSERC - Chairholder Profile )〕 Born in Pobedim, Slovakia, Veizer has received the Killam Award (Canada Council, 1986), the 1987 W.W. Hutchison Medal for young individuals making exceptional advances in Canadian earth science research; the 1991 Willet G. Miller Medal for outstanding contributions in geology; the 1992 Gottfried Wilhelm Leibniz Prize,which carried a 1.55 million euro value, awarded for understanding of the geochemistry of sediments; the 1995 Logan Medal which is the Geological Association of Canada's highest honour (); the 2000 Bancroft Award for contributions furthering the public understanding of the Earth sciences. During his career, Veizer oversaw the collection of a series of more than 4,500〔 measurement data of oxygen isotopes in calcite and aragonite shells used to build up climate and sedimentary data of the whole Phanerozoic based on tropical sea surface temperatures. == Cosmic rays and climate change == In a letter to ''Nature'', Veizer et al.(2000), compared the reconstruction of tropical sea surface temperatures throughout the Phanerozoic eon (the past ~550 Myr) with the variable galactic cosmic rays and concluded that their results can be reconciled if atmospheric carbon dioxide concentrations were not the principal driver of climate variability on geological timescales for at least one-third of the Phanerozoic eon, or if the reconstructed carbon dioxide concentrations are not reliable.〔Veizer, Ján; Godderis, Yves; François, Louis M. (2000): ''Evidence for decoupling of atmospheric and global climate during the Phanerozoic eon''. In: Letters to ''Nature'' 408, 698-701 (December 2000) 〕 In 2003, together with Nir J. Shaviv, an Israeli astrophysicist, Veizer published a paper in GSA Today confirming a reduced (capped) influence of carbon dioxide to climate change and attributing a more significant influence to cosmic rays.〔Nir J. Shaviv, Ján Veizer: Celestial driver of Phanerozoic climate?, 2003, S. 4–10, Geological Society of America, http://www.geosociety.org/gsatoday/archive/13/7/pdf/i1052-5173-13-7-4.pdf〕 Veizer and Shaviv commented that their model on a doubled carbon dioxide content in the last century would result in a warming of 1.5 °C, according to Veizer and Shaviv in line with the minimum level of the IPCC estimate between 1.5 to 4.5 °C.〔(【引用サイトリンク】 publisher=Informationsdienst Wissenschaft, Nachrichten, Termine, Experten )〕 However, the paper was criticized by a subsequent publication in 2004 by Stefan Rahmstorf and other climate scientists in the journal ''Eos'' (American Geophysical Union), in which the authors wrote, "''The correlation of CRF (ray flux ) and climate over the past 520 m.y. appears to not hold up under scrutiny''". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jan Veizer」の詳細全文を読む スポンサード リンク
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