极地冰芯中的氢氧稳定同位素是研究过去气候变化的重要指标，冰盖表层雪冰同位素也被用来反映水汽来源及路径。但影响同位素分馏的因素很多且发生在水循环整个过程中，水汽尤其关键。因此南极冰盖表层大气水汽同位素的观测和研究更是揭示过去温度变化、南极水汽传输过程的必要工作。本研究基于激光光谱仪在南极冰盖表面的水汽同位素实地观测，进行以下研究：1）揭示冰盖表面地形-温度-海拔三者作用下的水汽同位素地域分异特征；2）内陆不同区域的水汽传输控制格局；3）基于实测水汽同位素分析极端干燥的南极内陆高原平流层水汽入侵以及Brewer-Dobson环流对极地水汽的可能补给特征。4）对低温过饱和状态环境下凝华/升华作用及沉降后表雪层同位素分馏特征进行分析。本研究计划希望从数据上填补该区域大气水汽同位素的监测空白，对提高冰芯反演气候精度、认识南极内陆气-雪界面的物质交换过程有进一步认识。

Stable isotope in polar ice cores were used as the key to indicate climate change. In Antarctica it is also the tracer of moisture source. But accurate measurement of atmospheric water vapor isotopic composition is required urgently for quantifying the atmosphere-snow isotope fractionation processes and identifying moisture source in Antarctic plateau region，this project based on novel real time measurements of water vapor isotopes along the transect from Zhongshan station to Dome Argus (hereafter Dome A) in East Antarctica for the first time and aimed to the study of follow questions: a) presents spatial variation characteristic of surface vapor stable isotopic composition of Antarctica; b) Spatial variation of vapor isotopic composition and its implication to different regimes controlling the inland water cycle; 3) To quantitatively research stratosphere intrusion of air and vapor derived from low latitudes by Brewer–Dobson circulation；4) To reveal the substantial domination role of supersaturation sublimation/condensation effect in inland atmosphere and snow isotope exchange processes. This study would fill the observation gap of atmosphere water vapor isotope composition above the ice sheet surface, and would have great help in understanding the ice sheet evolution and snow-air surface mass-isotope exchange.