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【原创】亚洲季风的变化促成了北半球大冰期的来临？
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本人小作一篇，欢迎大家讨论，拍砖。 Mid-Pliocene Asian monsoon intensifi cation and the onset of Northern Hemisphere glaciation Zhang et al., 2009, GEOLOGY ABSTRACT The late Pliocene onset of major Northern Hemisphere glaciation (NHG) is one of the most important steps in the Cenozoic global cooling. Although most attempts have been focused on high-latitude climate feedbacks, no consensus has been reached in explaining the forcing mechanism of this dramatic climate change. Here we present a key low-latitude climate record, the high-resolution Asian monsoon precipitation variability for the past fi ve million years, reconstructed from South China Sea sediments. Our results, with supporting evidence from other records, indicate signifi cant mid-Pliocene Asian monsoon intensifi cation, preceding the initiation of NHG at ca. 2.7 Ma ago. This 1.4-million-year-long monsoon intensifi cation probably enhanced monsoon-induced Asian continental erosion and chemical weathering and in the process left fi ngerprints in marine calcium isotopes. Furthermore, increased rock weathering and/or organic carbon burial probably lowered the contemporary atmospheric CO2 and may have triggered the NHG onset. 附文章链接 http://www.namipan.com/d/i0091-7 ... 1c5f9d85b0fbe390900 [ Last edited by star580 on 2009-7-5 at 17:06 ] |
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