Ice core data of Sodium (Na), Chlorine (Cl), and Acidity from 6 Greenland ice cores 1750-2012

Tropospheric reactive chlorine impacts the oxidation capacity of the atmosphere and may be influenced by anthropogenic activity, with potential implications for Northern Hemisphere ice core records of chlorine since the Industrial Revolution. Anthropogenic impacts on chlorine include direct emission of hydrochloride acid (HCl) from combustion, the mobilization of HCl from sea salt aerosol driven by atmospheric acidity, and heterogeneous chemistry converting sea salt chloride into reactive gaseous chlorine species (e.g., chlorine nitrite (ClNO2)). Here we present ice-core chlorine (Cl), sodium (Na), and acidity records from six Greenland ice cores (ACT_11d, Summit07, Summit10, Tunu, NEEM, NGT_B19). ACT_11d ice core was drilled in year 2011 at 66.5 ºNorth (N), 46.3 ºWest (W). Summit07 ice core was drilled in year 2007 at 72.6 ºN, 38.6 ºW. Summit10 ice core was drilled in year 2010 at 72.3 ºN, 38.3 ºW. Tunu ice core was drilled in year 2013 at 78.0 ºN, 33.9 ºW. NEEM ice core was drilled in year 2011 at 77.5 ºN, 51.1 ºW. NGT_B19 was drilled in year 1993 at 78.0 ºN, 36.4 ºW. Precise locations and other information are summarized in Ice Core Information.csv. Details on core extraction and dating are described in previous publications (Geng et al., 2014; Iizuka et al., 2018; McConnell et al., 2019; Opel et al., 2013; Spolaor et al., 2016). Ice core records are separated into two files: GreenlandIceCoreIonConcentration.csv contains ion concentration of Na and Cl, and calculated acidity (H+) for Summit07 ice core, GreenlandIceCoreElementalConcentration.csv contains elemental concentration of Na and Cl, and measured acidity for other Greenland ice cores.对流层活性氯会影响大气氧化能力，且可能受到人为活动的调控，其研究结果对工业革命以来北半球的氯冰芯（ice core）记录具有潜在指示意义。人为活动对氯循环的影响包括：燃烧过程直接排放氯化氢（HCl）、大气酸度驱动海盐气溶胶（sea salt aerosol）中氯化氢的释放，以及通过非均相化学反应（heterogeneous chemistry）将海盐氯化物转化为活性气态氯物种（reactive gaseous chlorine species），例如亚硝酸氯（ClNO₂）。本研究公开了6个格陵兰冰芯的氯（Cl）、钠（Na）及酸度记录，分别为ACT_11d、Summit07、Summit10、Tunu、NEEM及NGT_B19。其中，ACT_11d冰芯于2011年在北纬66.5°、西经46.3°处钻取；Summit07冰芯于2007年在北纬72.6°、西经38.6°处钻取；Summit10冰芯于2010年在北纬72.3°、西经38.3°处钻取；Tunu冰芯于2013年在北纬78.0°、西经33.9°处钻取；NEEM冰芯于2011年在北纬77.5°、西经51.1°处钻取；NGT_B19冰芯于1993年在北纬78.0°、西经36.4°处钻取。冰芯的精确位置及其他详细信息汇总于Ice Core Information.csv文件中。冰芯获取与定年的详细方法已在既往发表文献（Geng等，2014；Iizuka等，2018；McConnell等，2019；Opel等，2013；Spolaor等，2016）中进行了阐述。本次公开的冰芯记录分为两个数据文件：GreenlandIceCoreIonConcentration.csv包含钠与氯的离子浓度，以及Summit07冰芯的计算酸度（H+）；GreenlandIceCoreElementalConcentration.csv则包含其余格陵兰冰芯的钠与氯元素浓度，以及实测酸度。