贵州纳朵洞滴水δ18O/δD的年际变化特征及其对ENSO的响应
Interannual variations of drip water δ18O to δD Ratios in Naduo Cave of Guizhou and response to ENSO activities
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摘要: 于2013年1月至2016年12月期间，对贵州纳朵洞洞内4处滴水和洞外降水的氢、氧稳定同位素（δ18O、δD）进行了4年的监测，发现滴水δ18O和δD都均匀地分布在当地大气降水线（LMWL）附近，说明大气降水是洞穴滴水的主要来源，且滴水δ18O和δD继承了当地大气降水δ18O和δD的信号.结合大气环流格局的分析，研究区大气降水δ18O和δD在监测时段内较好地响应了从El Niño向La Niña的转换.由于岩溶地下水的混合作用和包气带水的蒸发分馏，纳朵洞4处洞穴滴水δ18O和δD在雨季偏正，旱季偏负，与大气降水δ18O和δD旱季偏正，雨季偏负的特征相反；同时，滴水δ18O和δD在监测时段内对ENSO的响应，总体表现为在La Niña期间偏正，El Niño期间偏负，与大气降水δ18O和δD对La Niña和El Niño的响应情况也相反.因此，利用纳朵洞石笋δ18O记录研究古气候高分辨率的季节和年际变化，要充分考虑以上情况.Abstract: From January 2013 to December 2016, the dynamic observations of oxygen and hydrogen stable isotopes of meteoric precipitation and cave drip water had been performed in Naduo Cave, Guizhou Province. In the sdudy, it was found that the δD and δ18O of drip water were uniformly distributed near the Local Meteoric Water Line (LMWL). Most of the data were distributed in the lower right of the LMWL. This suggested that atmospheric precipitation was the main source of cave drip water, and δ18O and δD in the drip water had inherited the average level of δ18O and δD in the local precipitation, and that evaporation had a certain influence on the isotopic composition of the drip water in the cave. Combined with the analysis of atmospheric circulation pattern, the atmospheric precipitation δ18O and δD in the study area responded well to the transition from El Niño to La Niña during the monitoring period. Due to the mixing effect of karst groundwater and the partial evaporation of vadose water, the δ18O and δD of drip water in Naduo Cave were relatively higher in the rainy seasons and lower in the dry seasons, contrary to the δ18O and δD of atmospheric precipitation. The drip water δ18O and δD were generally positive during La Niña and negative during El Niño, contrary to the responses of atmospheric precipitation δ18O and δD to ENSO activities. Therefore, careful attention should be paid to high-resolution reconstruction of paleoclimate using stalagmites from this cave.
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Key words:
- Cave drip water /
- δ18O /
- δD /
- ENSO /
- Naduo Cave of Guizhou
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