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藏东南不同季节水体中氧同位素的高程递减变化研究
  • ISSN号：ISSN- 0023074X
  • 期刊名称：科学通报
  • 时间：2009.8.15
  • 页码：2742-2750
  • 分类：S646[农业科学—蔬菜学;农业科学—园艺学] TD235.1[矿业工程—矿井建设]
  • 作者机构：[1]中国科学院青藏高原研究所青藏高原环境变化与地表过程重点实验室,北京100085, [2]中国科学院研究生院,北京100049, [3]Byrd Polar Research Center, the Ohio State University, Columbus, Ohio 43210, USA
  • 相关基金：中国科学院项目群、国家自然科学基金（批准号：40571039,40701037和40830638）资助姚檀栋院士及两位匿名审稿专家提出宝贵的意见和建议,中国科学院藏东南高山环境综合观测研究站的同事帮助我们在鲁朗长期连续地收集降水样和定点河水样,在此一并表示感谢.
  • 相关项目：利用降水中稳定同位素研究孟加拉湾和南中国海季风的爆发过程与季节转换特征
作者： 杨晓新|徐柏青|杨威|曲冬梅|林平南|
关键词： 藏东南, 降水, 河水, 氧同位素, 高程效应
中文摘要：

通过分季节研究藏东南地区水体中氧同位素（δ18O）的变化,揭示了δ18O随海拔变化的特征,进而分析了相关的大气环流过程.研究结果表明,藏东南河水的δ18O和降水中δ18O的变化趋势一致;同时也表明,藏东南河水中δ18O随海拔的升高而降低的特征在不同时期有差异.季风期河水的δ18O值最低,其随高程递减的速率也最小.西风期河水的δ18O值也较低,仅次于季风降水期,随海拔递减的速率也较小.季风前河水中的18O最富集,且与海拔的负相关线性关系相对最不显著;而季风后河水中δ18O值随海拔变化的递减速率最大.河水的δ18O值在不同季节与高程效应的符合程度不同,反映了不同的河水补给的影响.需要说明的是,虽然不同季节的采样数目并不相同,但各自的δ18O-H线性相关系数都达到了0.05的置信度.因此,不同季节的河水δ18O的高程效应代表了氧同位素在大气环流和地表过程作用下的变化特征.

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