Impacts of cave ventilation on drip water δ13CDIC and its paleoclimate implication
Impacts of cave ventilation on drip water δ13CDIC and its paleoclimate implication
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洞穴通风对滴水Ύ´13CDIC的影响及其古气候意义
DOI：
10.1016/j.quaint.2020.03.050
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发表时间：
2020-04
影响因子：
2.2
通讯作者：
Shijie Wang
中科院分区：
文献类型：
--
作者：
Yina Lyu;Weijun Luo;Yanwei Wang;Guangneng Zeng;Yang Wang;Anyun Cheng;Lin Zhang;Jia Chen;Xianli Cai;Runyu Zhang;Shijie Wang
洞穴沉积物稳定碳同位素（δ 13 C）是恢复古气候的重要指标。了解滴水中溶解无机碳（δ 13 C DIC）的稳定碳同位素组成是解释洞穴沉积物δ 13 C信号的关键。本文报道了沙湾洞2 a的滴水δ 13 C DIC数据及其水文地球化学变量（P CO2、Ca 2+、Mg/Ca、SO 42-、pH、滴水速率、方解石饱和指数、电导率）。对大气、土壤空气、洞穴空气中的PCO 2和微环境因子进行了连续原位监测。结果表明，洞穴空气CO2主要来源于土壤空气CO2，但洞穴空气CO2与土壤空气CO2季节变化不同步，这可能是洞穴通风造成的。洞穴通风也是滴水δ 13 C、DIC和洞穴沉积物生长季节性变化的原因。在春、夏季，洞穴空气交换导致滴水δ 13 C DIC升高，洞穴沉积物生长迅速;洞穴空气停滞导致滴水δ 13 C DIC降低，洞穴沉积物生长缓慢。在洞穴换气条件下，土壤空气中同位素较轻的CO2对滴水δ 13 C DIC的影响在春夏季节大于秋冬季节，土壤空气中同位素较轻的CO2被滴水富集。沙湾洞洞穴沉积物δ 13 C在春夏季节生长迅速，具有记录春夏季节气候信息的潜力。此外，通过对11个洞穴的洞穴沉积物δ 13 C值的比较，发现洞穴沉积物δ 13 C记录的古气候信号在不同的通风类型下具有不同的季节偏差。因此，有必要确定洞穴通风类型，以了解洞穴沉积物δ 13 C对通风洞穴气候变化的响应。
The speleothem stable carbon isotope (δ 13 C) is an important proxy for paleoclimate reconstruction. Understanding the stable carbon isotope composition of dissolved inorganic carbon (δ 13 C DIC) in drip water is crucial for the interpretation of speleothem δ 13 C signals. In this study, we present two years of drip water δ 13 C DIC data and its hydrogeochemistry variables (eg P C O 2, Ca 2+, Mg/Ca, SO 4 2−, pH, drip rate, saturation index of calcite, electrical conductivity) in the Shawan Cave. We also conducted continuous in situ monitoring of P C O 2 in the atmosphere, soil air, and cave air and microenvironmental factors. The results show that cave air CO 2 primarily originates from soil air CO 2, but there is an unsynchronous seasonal variation between cave air CO 2 and soil air CO 2, which is likely caused by cave ventilation. Cave ventilation is also responsible for seasonal variations in drip water δ 13 C DIC and speleothem growth. Cave air exchange leads to higher drip water δ 13 C DIC and rapid speleothem growth in the spring and summer seasons, and cave air stagnation results in lower drip water δ 13 C DIC and slow speleothem growth. The impact of isotopically light CO 2 of soil air on drip water δ 13 C DIC during spring and summer seasons is more than during autumn and winter seasons, where the more isotopically light CO 2 of soil air is enriched by drip water under cave air exchange conditions. Since speleothems growth is rapid in the spring and summer seasons, the speleothems δ 13 C of the Shawan Cave have the potential to record climate information for the spring and summer seasons. Additionally, by comparing the speleothem δ 13 C values of eleven caves, we found that paleoclimate signals recorded by speleothem δ 13 C revealed different seasonal biases under different ventilation types. Therefore, it is necessary to determine the cave ventilation type in order to understand how speleothem δ 13 C responds to climate change in a ventilated cave.
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