Pedosphere 16(3): 371--379, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Using a tree ring δ13C annual series to reconstruct atmospheric CO2 concentration over the past 300 years |
| ZHAO Xing-Yun1,2, QIAN Jun-Long3, WANG Jian1, HE Qing-Yan1, WANG Zu-Liang4 and CHEN Cheng-Zhong1,2 |
1 College of Geographical Science, Nanjing Normal University, Nanjing 210097 (China). E-mail: sdlysm@vip.sina.com;
2 Geography and Tourism Department, Linyi Teachers' College, Linyi 276005, Shandong (China);
3 Lake Sediment and Environment Laboratory, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008 (China);
4 Administrative Bureau of Tianmu Mountain National Natural Protection District, Lin'an 311311, Zhejiang (China) |
| ABSTRACT |
| The annual series of δ13C were measured in tree rings of three Cryptomeria fortunei disks (CF-1, CF-2, and CF-3) collected from West Tianmu Mountain, Zhejiang Province, China, according to cross-dating tree ring ages. There was no obvious decreasing trend of the δ13C annual time series of CF-2 before 1835. However, from 1835 to 1982 the three tree ring δ13C annual series exhibited similar decreasing trends that were significantly (P≤0.001) correlated. The distribution characteristics of a scatter diagram between estimated δ13C series of CF-2 from modeling and the atmospheric CO2 concentration extracted from the Law Dome ice core from 1840 to 1978 were analyzed and a curvilinear regression equation for reconstructing atmospheric CO2 concentration was established with R2 = 0.98. Also, a test of independent samples indicated that between 1685 and 1839 the reconstructed atmospheric CO2 concentration using the δ13C series of CF-2 had a close relationship with the Law Dome and Siple ice cores, with a standard deviation of 1.98. The general increasing trend of the reconstructed atmospheric CO2 concentration closely reflected the long-term variation of atmospheric CO2 concentration recorded both before and after the Industrial Revolution. Between 1685 and 1840 the evaluated atmospheric CO2 concentration was stable, but after 1840 it exhibited a rapid increase. Given a longer δ13C annual time series of tree rings, it was feasible to rebuild a representative time series to describe the atmospheric CO2 concentration for an earlier period and for years that were not in the ice core record. |
| Key Words: atmospheric CO2 concentration, δ13C, reconstruction, time series, tree ring |
| Citation: Zhao, X. Y., Qian, J. L., Wang, J., He, Q. Y., Wang, Z. L. and Chen, C. Z. 2006. Using a tree ring δ13C annual series to reconstruct atmospheric CO2 concentration over the past 300 years. Pedosphere. 16(3): 371-379. |
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