A high-resolution stalagmite O-C isotope record from Nanjing and its rapid response to climatic events |
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Authors: | Jiangying?Wu Email author" target="_blank">Yongjin?WangEmail author Hai?Cheng Jun?Chen |
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Institution: | (1) Earth Science Department, Nanjing University, 210093 Nanjing, China;(2) Geography College, Nanjing normal University, 210097 Nanjing, China;(3) Geology and Geophysics Department, Minnesota University, 55455, MN, USA |
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Abstract: | Here we discussed rapid response of the cave temperature and vegetation to the four Dansgaard-Oeschger cold and warm cycles
during 50-40 kaBP based on results of oxygen and carbon stable isotopic compositions from a stalagmite in Tangshan, Nanjing.
It is found that the amount of C3 vegetation relative to C4-type declines during the D-O warm events, indicating the decrease of the effective meteoric precipitation. Compared with
O-isotope records of the Greenland ice core, the stalagmite record displays a very similar pattern to Greenland ice core record
over the decade-century time scale, suggesting that the changes of the East Asian monsoon climate are in accordance with the
high-latitude polar climate in the short-term time scale. The age of the ice-rafted H5 event in the stalagmite record, however,
preceded that of Greenland ice cores by 2 ka. This out of phase between the remote areas cannot be yet proven because the
two time scales were determined from different dating methods. |
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Keywords: | Dansgaard-Oeschger cycle East Asian monsoon climate stalagmite |
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