贵州凉风洞大气降水-土壤水-滴水的δ18O信号传递及其意义

被引：36

作者：

罗维均

王世杰

机构：

[1] 中国科学院地球化学研究所环境地球化学国家重点实验室

来源：

科学通报 | 2008年 / 17期

关键词：

贵州凉风洞; 洞穴滴水; 氧同位素; 洞穴次生化学沉积物; 古气候;

D O I：

暂无

中图分类号：

P532 [古气候学]; P595 [元素地球化学];

学科分类号：

摘要：

通过对贵州荔波凉风洞(LFD)大气降水、土壤水、土壤气、洞穴滴水以及滴水对应的现代化学沉积物氧(氢)同位素组成的系统监测,发现LFD土壤水和滴水主要来源于当地大气降水;3种水(大气降水、土壤水和滴水)氧同位素值的变化幅度在年内依次减小,分别在0～-10‰,-2‰～-9‰和-6‰～-8‰之间;3种水氧同位素值之间存在大致协调同步的季节变化规律:雨季偏轻,旱季偏重;地表蒸发作用导致滴水氧同位素年算术平均值相对于大气降水值偏重约0.3‰以上.计算结果验证了LFD系统中洞穴次生化学沉积物形成过程基本达到了氧同位素平衡,利用洞穴沉积物氧同位素值恢复和重建古气温和降水量是可行的,但应注意研究区地表蒸发作用对氧同位素值的调节作用。

引用

页码：2071 / 2076

页数：6

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