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| 洞穴滴水-CaCO3体系氧碳同位素组成的气候意义研究现状和问题 |
| Research Status of Climatic Implications of Oxygen and Carbon Isotopic Compositions in Cave Drip Water-Carbonate Systems |
| 投稿时间：2013-09-02 修订日期：2013-09-25 |
| DOI：10.14050/j.cnki.1672-9250.2015.02.013 |
| 中文关键词: 滴水-CaCO3体系;氧碳同位素组成;先期碳酸盐沉积;平衡分馏;动力分馏;石笋古气候重建 |
| 英文关键词: Cave drip water-CaCO3 system;carbon;oxygen;isotopic composition;prior calcite precipitation;equilibrium fractionation;dynamic fractionation;speleothem paleoclimate reconstruction |
| 基金项目:国家自然科学基金(41172232)。 |
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| 摘要点击次数: 706 |
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| 中文摘要: |
| 近年来,通过对洞穴滴水-CaCO3体系各项指标的长期监测,以了解现代碳酸钙沉积的形成机制成为了石笋古气候研究的重点。尤其是对滴水-CaCO3体系氧同位素组成(δ18O)的研究取得了显著的进展。人们在对滴水和CaCO3的δ18O与古温度关系的研究中,不断地修改普遍使用的关系式,甚至提出了适合自身研究区石笋δ18O与温度的关系式。无疑这将增加利用石笋氧同位素组成重建本地区古温度的可信度。在对碳同位素组成(δ13C)的研究中,学者们更加细致地研究了各种影响滴水δ13C值的因素(如先期碳酸盐沉积PCP、通风条件等),为更好地利用石笋δ13C重建古气候环境提供了科学支撑。由于洞穴监测条件的限制,至今大多数洞穴都未能建立起完善的自上而下的监测体系,所以对一些δ18O、δ13C变化的解译仍然存在多解性和不确定性,有待未来的研究继续加强。 |
| 英文摘要: |
| In recent years, monitoring drip water-CaCO3 systems in karst caves to understand the forcing mechanisms of modern calcite has become the focus in speleothem paleoenvironmental research. Especially, the study on oxygen isotope compositions has achieved considerable progress. In the study on the relationship between CaCO3 δ18O and temperature, researchers modified the commonly used equations continuously, and even put forward their own equations which are more appropriate to their research areas, and thus increased the accuracy and confidence level of the calculated paleotemperature. In the study on carbon isotopes, researchers studied various influences on the δ13C values in more detail (such as PCP, Ventilation), which provide a scientific support to reconstructing the paleoclimate with the speleothem δ13C values. However, due to complex drip water-CaCO3 systems, the integrated monitoring systems haven't set up in most cases. Therefore, there is high uncertainty in climatic interpretation of carbon and oxygen isotopic compositions need to be solved in future researches. |
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