Abstract. Ice core dating is the first step for a correct interpretation of climatic and environmental changes. In this work, we release a stratigraphic dating of the uppermost 197 m of the 250 m deep GV7(B) ice core (drilling site, 70°41’S, 158°52’E, 1950 m a.s.l.) with a sub-annual resolution. Chemical stratigraphies of NO₃⁻, MSA (methanesulfonic acid), non-sea salt SO₄²⁻, sea-salt ions and the oxygen isotopic composition (δ¹⁸O) were used in the annual layer counting upon the identification of a seasonal profile in their records. Different procedures were tested and thanks to the volcanic history of the core, obtained in previous works, an accurate age-depth correlation was obtained for the period 1179–2009 CE. Once the dating of the core was finalized, the annual mean accumulation rate was evaluated throughout the analyzed 197 m of the core, obtaining an annually resolved history of the snow accumulation on site in the last millennium. A small, yet consistent, rise in accumulation rate was found for the last 830 years since the middle of the 18^th century.

中文翻译：

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利用高分辨率化学地层法对南极东部冰芯（GV7）进行测年

摘要。冰芯测年是正确解释气候和环境变化的第一步。在这项工作中，我们发布了250m深的GV7（B）冰芯（钻探位置，南纬70°41'，东经158°52'，1950 m asl）中最上层197 m的地层测年。NO的化学地层学₃ ^-，MSA（甲磺酸），非海盐SO ₄ ^2-，海盐离子和氧同位素组成（δ ¹⁸O）在其记录中确定了季节概况后用于年度层计数。测试了不同的程序，并且由于先前工作中获得的岩心火山历史，在1179-2009 CE时期获得了准确的年龄-深度相关性。岩心测年完成后，将对分析的197 m岩心的年平均积聚率进行评估，以获取上一千年现场雪积聚的年解析历史。一个小的，但一致的，上涨的累积比率被发现以来的18的中央最后830年^个世纪。