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首页> 外文期刊>Journal of Hydrology >The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction
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The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction

机译：基于10年的洞穴监测的碳同位素的运输机制：古古镇重建的影响

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Cave monitoring is crucial to unraveling the factors controlling carbon isotope compositions and their transportation in karst systems. Here, we report a 10-year (2010 similar to 2019) cave monitoring of carbon isotopes from the plants, soil, cave water, and speleothems in Jiguan Cave, Central China, located on the Chinese north-south divide in an area that is sensitive to the Asian monsoon. The results show that the cave ventilation and soil air CO2 controlled by the local temperature and humidity conditions are responsible for the seasonal variability in the delta C-13(DIC) values. The variation in the delta C-13(DIC) values and trace element ratios of the cave water are sensitive to the local hydrological conditions. Although there is the lag time from precipitation to cave water in drought year, the delta C-13(DIC) and trace element ratios (Mg/Ca, Ba/Ca and Sr/Ca) of cave water are strongly coupled and reflect the extreme drought due to the influence of prior calcite precipitation (PCP) and water-rock interaction. The 10-year monitoring period covered two complete El Nino Southern Oscillation (ENSO) cycles. During the two strong El Nino years (2010 and 2015), the cave drip water delta C-13(DIC) values were negative but the delta O-18 values were positive. This opposite trend is mainly due to their different controlling mechanisms. The rainfall amount and moisture sources are responsible for the delta C-13(DIC) and delta O-18 values of the drip water, respectively. Throughout the karst cave system, the carbon isotopes in Jiguan Cave are continuously enriched when migrating from the vegetation to the soil to the cave drip water to the modern speleothems. Comparisons with the stalagmite delta C-13 records for the nearby Jiguan Cave suggest that stalagmite carbon isotopes may reflect the regional precipitation changes induced by the ENSO on the decadal scale. Overall, we demonstrate that the delta C-13 is a potentially reliable proxy that records the changes in the regional environment, especially precipitation changes, and is also a sensitive indictor that indirectly reflects ENSO.
机译：洞穴监测对于揭示控制碳同位素组成及其在岩溶系统中迁移的因素至关重要。在这里，我们报告了一项为期10年（2010年类似于2019年）的洞穴监测，监测中国中部鸡冠洞的植物、土壤、洞穴水和洞穴中的碳同位素，该洞穴位于中国南北分水岭上，对亚洲季风敏感。结果表明，洞穴通风和受当地温度和湿度条件控制的土壤空气CO2是造成δC-13（DIC）值季节变化的原因。洞穴水的δC-13（DIC）值和微量元素比值的变化对当地水文条件敏感。虽然干旱年份从降水到洞穴水存在滞后时间，但洞穴水的δC-13（DIC）和微量元素比值（Mg/Ca、Ba/Ca和Sr/Ca）是强耦合的，反映了由于先前方解石降水（PCP）和水-岩相互作用的影响而导致的极端干旱。10年监测期包括两个完整的厄尔尼诺-南方涛动（ENSO）周期。在两个强劲的厄尔尼诺年份（2010年和2015年），洞穴滴水δC-13（DIC）值为负值，而δO-18值为正值。这种相反的趋势主要是由于它们的控制机制不同。降雨量和水分来源分别决定滴水的δC-13（DIC）和δO-18值。在整个溶洞系统中，鸡冠洞的碳同位素在从植被迁移到土壤、从洞穴滴水迁移到现代洞穴时不断富集。与附近鸡冠洞的石笋delta C-13记录的比较表明，石笋碳同位素可能反映了ENSO在十年尺度上引起的区域降水变化。总体而言，我们证明了三角洲C-13是记录区域环境变化，特别是降水变化的潜在可靠指标，也是间接反映ENSO的敏感指标。

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