High-resolution lanthanum 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采集自拉克拉韦尔高原（Plateau Laclavere）——南极半岛最北端的一处小型冰盖。该冰芯于2016年1月采用便携式太阳能供电电动冰芯钻机（Backpack Drill; icedrill.ch AG）钻探至19.93米深度，钻孔位置海拔约1090米。2017年夏季，美国内华达州里诺市沙漠研究所（Desert Research Institute, DRI）痕量化学实验室使用两台赛默飞世尔（Thermo Finnigan）Element2型高分辨率电感耦合等离子体质谱仪（High Resolution-Inductively Coupled Plasma-Mass Spectrometry, HR-ICP-MS）结合连续流动分析（Continuous Flow Analysis, CFA）系统，对OH-12冰芯中的钙、氯、锶、镝、铈、镧等冰化学参数进行了测定，实验方法参照Röthlisberger等（2000）与McConnell等（2002）的研究成果。该冰芯通过过氧化氢浓度测量的年层计数进行定年，并结合欧洲中期天气预报中心（European Centre for Medium-Range Weather Forecasts, ECMWF）ERA5再分析数据中距离本钻探点最近的网格点降水资料，校正了钻探区域的降水间断性影响。OH-12冰芯的时间覆盖范围为2011年7月至2016年1月。