| 桂林地区44ka洞穴石笋碳酸钙（盐）δ^13C的同位素组成与大气CO2浓度估算 |
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| 关键词:stalagmite carbonate carbon isotope CO2 concentration Guilin |
| 基金项目:袁道先院士主持的IGCP448对比项目; 科技部攀登特别资助项目“全球岩溶生态系统对比”(编号:2000026) |
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| The δ13C Isotopic Composition of Cave Stalagmite Carbonate and the Estimation of the Atmospheric CO2 Concentration Since 44 ka in Guilin Area |
| The δ 13C isotopic record of stalagmite carbonate in caves shows that, like δ 18O isotopic record, it can reflect the cold and warm cyclic change of the climatic environment, and can also reveal the events of quick and sudden changes. This paper attempts to estimate the atmospheric CO 2 concentration since 44 ka in Guilin area by using the δ 13C isotopic composition of new and old stalagmite carbonates in caves. The experimental results show that it is basically close to the atmospheric CO 2 concentration of the recently measuring air and one of the compositional analyses of ice core as well as to the estimated value of the loess sediment carbonate in North China. The data obtained are comparable with each other. This demonstrates clearly that it is feasible to apply the δ 13C isotopic composition of stalagmite carbonate to estimating the atmospheric CO 2 concentration. The study indicates that the δ 13C isotopic records of stalagmite carbonate in caves have distinctive sensitivity to the cold events in the geological history, especially to the cold event of the Younger Dryas and H 1, H 2,H 3, H 4 and H 5 cold events of the Heinrich .The δ 13C isotope values of stalagmite carbonate in caves rise quickly in the dry-cold peroid, being totally in inverse proportion to the change of the atmospheric CO 2 concentration, which is consistent with the evolution of the global climate. Nevertheless, the characteristics of regional climatic change are also obvious. |
| ZHANG Mei-liang,LIN Yu-shi,QIN Jia-ming.2001.The δ13C Isotopic Composition of Cave Stalagmite Carbonate and the Estimation of the Atmospheric CO2 Concentration Since 44 ka in Guilin Area[J].Acta Geoscientica Sinica,22(5):447-452. |
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