Complicated responses of stalagmite δ 13C to climate change during the last glaciation from Hulu Cave, Nanjing, China
Complicated responses of stalagmite δ 13C to climate change during the last glaciation from Hulu Cave, Nanjing, China
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DOI：
10.1360/04yd0140
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
X. Kong;Yongjin Wang;Jiangying Wu;Hai Cheng;R. Edwards;Xianfeng Wang
中科院分区：
文献类型：
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作者：
X. Kong;Yongjin Wang;Jiangying Wu;Hai Cheng;R. Edwards;Xianfeng Wang
我们提供了一个碳稳定同位素组成（δ 13 C）的记录，覆盖了7.5万年到1万年前（ka B. P.），来自南京葫芦洞。重叠的d 13 C剖面在模式和幅度上都非常相似，表明它们主要记录气候信号。在末次冰期-间冰期过渡期，δ 13 C值变化>6‰，表明土壤中C3和C4类型植物的贡献不同。然而，在千年尺度上，在温暖的Dansgaard-Oeschger（DO）事件期间增加的方解石δ 13 C表明，当通过土壤的水通量率较大时，溶解的生物源CO2减少。更重的d13 C和更高的降水之间的这种相关性与我们先前关于样品的稳定氧同位素记录的报告一致（Wang等人，2001年）。石笋的δ 13 C和δ 18 O的对比表明，石笋的碳同位素动力学分馏与石笋的生长速率密切相关。研究还表明，在冰消期，当地植被变化可能滞后于降水变化δ700年。
We present a record on carbon stable isotopic composition (δ 13C), covering 75 through 10 thousands years ago (ka B.P.), from Hulu Cave, Nanjing. The overlapping d 13C profiles are very similar in pattern and range, indicating that they mainly record climatic signal. During the last glacial-interglacial transition, the >6‰ change of δ 13C values implies different contributions of C3 vs. C4 type plants in soils. On millennial scale, however, the increased calcite δ 13C during the warm Dansgaard-Oeschger (DO) events suggests a decrease of dissolved bio-genic CO2 when water flux rate through soil is large. This correlation between heavier d 13C and higher precipitation is consistent with our previous report on the samples’ stable oxygen isotope records (Wang et al., 2001). Comparison of coeval δ 13C and δ 18O of stalagmites indicates that kinetic fractionation of carbon isotope is closely related to growth rate of stalagmites. This study also shows that local vegetation changes may lag behind precipitation changes by δ700 years during the deglaciation.