南极中山站-Dome A断面表层雪稳定同位素空间分布及环境影响因素分析  

THE SPATIAL CHANGES AND IMPACT FACTORS OF WATER STABLE ISOTOPE IN SURFACE SNOW ALONG ZHONGSHAN STATION-DOME A

作　　者：马天鸣[1,2] 谢周清[1] 李院生[2] 安春雷[2] 史贵涛[2] 于金海[2] 马红梅[2] 姜苏[2] 

机构地区：[1]中国科学技术大学地球和空间科学学院,安徽合肥230026 [2]中国极地研究中心,上海200136

出　　处：《极地研究》2017年第2期210-217,共8页Chinese Journal of Polar Research

基　　金：国家高技术研究发展计划(863计划)(2011AA090401);南北极环境综合考察与评估专项(CHINARE2015-02-02);上海市自然科学基金(14ZR1444000)资助

摘　　要：中山站-Dome A断面是表层雪稳定同位素组成分析的理想区域,沿线进行δ18O、δD和d的空间分布及环境影响因素研究对反映东南极地区的气候变化和物质来源具有关键意义。因而,本文基于线性回归及相关性分析方法,详细探究了断面上多种环境因素与表层雪稳定同位素分布的空间关系。结果表明,温度和地理因素与同位素比值之间有显著相关关系,且海拔是地理因素中的主要影响因素,随海拔上升表层雪的δ18O呈线性下降趋势。另外,通过断面上δ-T斜率与南极其他断面对比,发现斜率可能具有冰盖近岸和内陆地区较低的区域性特征,而造成这一现象的原因是水汽源区的改变和低温条件下水汽过饱和时的同位素动力分馏。最后,d的空间分布在沿海区域和内陆区域也有不同,推测主控因素分别是水汽源区条件和温度。The traverse route from Zhongshan Station to Dome A on the Antarctic ice sheet is an ideal area to study the water-stable isotopic composition of surface snow. Analyzing spatial distribution and impact factors of water-stable isotopes along this section is of significance in reflecting the material source and climate change in the East Antarctic ice sheet. This paper discusses the synthetic effect of different environmental factors based on linear regression and correlation analyses. The results indicated that geographical factors and temperature have a significant correlation with 6180 and 6D, and both indexes show a tendency to decrease as elevations rise： the most important geographical factor. We also discovered that the 6-T slope varies in offshore and inland areas by comparing these with other sections. These variations are caused by changes in moisture source conditions and the action of the kinetic fractionation effect in a low-temperature, supersaturated environment. The spatial distribution of excess deuterium differs between the coastal and inland areas, leading to speculation that moisture source conditions, as well as temperature, are key factors.

关 键 词：中山-Dome A断面 表层雪 稳定同位素 环境因素 空间分布 

分 类 号：P426.635[天文地球—大气科学及气象学]