Centennial-scale Asian monsoon variability during the mid-Younger Dryas from Qingtian Cave,central China |
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Authors: | Dianbing Liu Yongjin Wang Hai Cheng Xinggong Kong Shitao Chen |
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Affiliation: | 1. College of Geography Science, Nanjing Normal University, Nanjing 210023, China;2. Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA;3. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an 710049, China |
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Abstract: | The regional climate correlation within the Northern Hemisphere in the cold/dry mid-Younger Dryas event (YD) remains elusive. A key to unraveling this issue is sufficient knowledge of the detailed climate variability at the low latitudes. Here we present a high-resolution (3-yr) δ18O record of an annually laminated stalagmite from central China that reveals a detailed Asian monsoon (AM) history from 13.36 to 10.99 ka. The YD in this record is expressed as three phases, characterized by gradual onsets but rapid ends. During the mid-YD, the AM variability exhibited an increasing trend superimposed by three centennial oscillations, well-correlated to changes in Greenland temperatures. These warming/wetting fluctuations show a periodicity of ~ 200 yr, generally in agreement with centennial changes in cosmogenic nuclides indicated by the 10Be flux from the Greenland ice. This relationship implies that centennial-scale climate changes during the mid-YD are probably caused by solar output and rapidly transported over broad regions through atmosphere reorganization. |
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Keywords: | Qingtian Cave Annually laminated stalagmite Asian monsoon Younger Dryas Sub-millennial oscillations |
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