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大高加索山南部大气降水氧同位素的气候意义

王涛 李廷勇 张键

王涛, 李廷勇, 张键. 大高加索山南部大气降水氧同位素的气候意义[J]. 中国岩溶, 2020, 39(3): 432-441.
引用本文: 王涛, 李廷勇, 张键. 大高加索山南部大气降水氧同位素的气候意义[J]. 中国岩溶, 2020, 39(3): 432-441.
WANG Tao, LI Tingyong, ZHANG Jian. Climatology interpretation of rainfall δ18Op across the southern Greater Caucasus region[J]. CARSOLOGICA SINICA, 2020, 39(3): 432-441.
Citation: WANG Tao, LI Tingyong, ZHANG Jian. Climatology interpretation of rainfall δ18Op across the southern Greater Caucasus region[J]. CARSOLOGICA SINICA, 2020, 39(3): 432-441.

大高加索山南部大气降水氧同位素的气候意义

基金项目: 国家自然科学基金项目(41772170,42011530078);西南大学西南山地生态循环农业国家级培育基地项目(5330200076);中央高校基本科研业务费专项资金(XDJK2017A010)

Climatology interpretation of rainfall δ18Op across the southern Greater Caucasus region

  • 摘要: 大高加索山脉位于黑海和里海之间,是欧洲与亚洲的分界线,该区域气候受到北大西洋涛动 (North Atlantic Oscillation, NAO)的强烈影响。为了对该区域的大气降水δ18O (δ18OP) 与NAO的关系有更加深入的认识,本文利用大高加索山以南6个全球降水同位素监测网(Global Network of Isotope in Precipitation, GNIP)站点的δ18OP数据,分析该区域δ18OP 的季节变化规律,以及δ18OP与温度和降水量等气象要素及大气环流之间的关系。得到以下主要认识:① 在月时间尺度上,δ18OP与月平均温度之间有着显著的正相关关系(p<0.01),表明该区域δ18OP主要受当地温度控制,表现出“温度效应”。② 北大西洋涛动通过改变西风的强度和位置从而影响δ18OP 的变化:当NAO呈现负相位时,此时西风输送较弱,使得来自地中海的富含18O的水汽能够达到大高加索山以南,该地区δ18OP偏正。而当NAO正相位时,西风急流输送较强,从北大西洋穿越黑海带来更多的δ18OP 偏轻的降水。因此,NAO所导致的水汽输送路径的变化可能是影响大高加索山以南地区δ18OP的重要因素,这一研究结果为利用该地区地质记录中的δ18O记录来重建过去的NAO变化提供了前提。

     

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  • 刊出日期:  2020-06-25

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