High-resolution calcium data of firn core OH-12 from Plateau Laclavere, northern Antarctic Peninsula@en

Firn core OH-12 was retrieved from Plateau Laclavere, a small ice cap on the northernmost end of the Antarctic Peninsula. It was drilled in January 2016 to a depth of 19.93 m at about 1090 m a.s.l. using a portable solar-powered and electrically operated ice-core drill (Backpack Drill; icedrill.ch AG). Glacio-chemical parameters in OH-12 (calcium, chlorine, strontium, dysprosium, cerium, lanthanum) were determined at the Trace Chemistry Laboratory of the Desert Research Institute (DRI) in Reno, Nevada, USA, in summer 2017 using two Thermo Finnigan Element2 High Resolution-Inductively Coupled Plasma-Mass Spectrometry (HR-ICP-MS) instruments connected to a Continuous Flow Analysis (CFA) system as described by Röthlisberger et al. (2000) and McConnell et al. (2002). The core was dated using annual layer counting of hydrogen peroxide measurements. We additionally accounted for precipitation intermittency at the drill site by using precipitation data from the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA5 Reanalysis extracted from the grid point closest to the firn-core drill sites. OH-12 covers the period from July 2011 to January 2016.粒雪芯（Firn core）OH-12采自南极半岛最北端的小型冰帽拉克拉韦尔高原（Plateau Laclavere）。该芯体于2016年1月在海拔约1090米处，采用便携式太阳能供电电动冰芯钻机（背包式钻机，Backpack Drill；icedrill.ch AG公司）钻取至19.93米深度。OH-12的冰川化学参数（钙、氯、锶、镝、铈、镧）于2017年夏季，在美国内华达州里诺市沙漠研究所（Desert Research Institute, DRI）的痕量化学实验室完成测定。实验使用两台赛默飞芬尼根（Thermo Finnigan）Element2型高分辨电感耦合等离子体质谱仪（High Resolution-Inductively Coupled Plasma-Mass Spectrometry, HR-ICP-MS），并连接至连续流分析系统（Continuous Flow Analysis, CFA），实验方法参照Röthlisberger等人（2000）与McConnell等人（2002）的研究方案。该芯体通过过氧化氢测量的年层计数法进行定年。此外，本研究还借助取自距离该粒雪芯钻探点最近的网格点的欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts, ECMWF）ERA5再分析降水数据，对钻探点的降水间歇性影响进行校正。OH-12粒雪芯覆盖的时间跨度为2011年7月至2016年1月。