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神农架石笋氧同位素的海拔效应

段福才 孔兴功

段福才, 孔兴功. 神农架石笋氧同位素的海拔效应[J]. 中国岩溶, 2011, 30(1): 101-104.
引用本文: 段福才, 孔兴功. 神农架石笋氧同位素的海拔效应[J]. 中国岩溶, 2011, 30(1): 101-104.
DUAN Fu-cai, KONG Xing-gong. Altitude effect on δ18O in stalagmites from Mt. Shennongjia, central China[J]. CARSOLOGICA SINICA, 2011, 30(1): 101-104.
Citation: DUAN Fu-cai, KONG Xing-gong. Altitude effect on δ18O in stalagmites from Mt. Shennongjia, central China[J]. CARSOLOGICA SINICA, 2011, 30(1): 101-104.

神农架石笋氧同位素的海拔效应

基金项目: 国家自然科学基金项目“神农架洞穴石笋氧同位素对山地气候的响应机理研究”(40771009)

Altitude effect on δ18O in stalagmites from Mt. Shennongjia, central China

  • 摘要: 作为古气候代用指标,石笋氧同位素为亚洲季风演化研究提供了一系列可靠的证据。然而,关于石笋氧同位素指示的气候意义一直存在争论。本文选取了位于神农架地区海拔1250~2250m的黑龙洞、青天洞和三宝洞3个洞穴进行对比分析,发现不同海拔洞穴石笋δ18O在波动形式上相同,但绝对值存在约-0.1‰/100m的系统差,而大气降水的在该地的海拔效应约为-0.2‰/100m。为此,我们认为,石笋δ18O除了受季风降雨的影响外,不同海拔的温度梯度也对石笋δ18O具有较大的贡献。结合洞穴年均温度,初步估算石笋δ18O的温度效应约为-0.25‰/℃,与O’Neil的同位素平衡分馏计算结果相同。

     

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出版历程
  • 收稿日期:  2011-01-11
  • 刊出日期:  2011-03-25

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