Healy_Discrete

Models project the Arctic Ocean will become undersaturated with respect to carbonate minerals in the next decade. Recent field results indicate parts may already be undersaturated in late summer months, when ice melt is at its greatest extent. However, few comprehensive datasets of carbonate system parameters in the Arctic Ocean exist. Researchers from the U.S. Geological Survey (USGS) and University of South Florida (USF) collected high-resolution measurements of pCO2, pH, total dissolved inorganic carbon (DIC), total alkalinity (TA), and carbonate (CO3-2) from the Chukchi Sea and Canada Basin that fill critical information gaps concerning Arctic carbon variability. A Multiparameter Inorganic Carbon Analyzer (MICA) was used to collect over 22,000 measurements of air and sea pCO2, pH, and DIC along a 9,450-km trackline during August 2010. In addition, 240 discrete surface water samples were taken. These data are being used to characterize and model regional pCO2, pH, and carbonate mineral saturation state. A high-resolution, three-dimensional map of these results will be presented.多模型预测显示，北冰洋将在未来十年内出现碳酸盐矿物饱和度不足的情况。近期实地观测结果表明，在海冰融化范围最大的夏末时节，北冰洋部分海域已出现该不饱和现象。然而，目前公开的北冰洋碳酸盐系统参数综合数据集仍较为匮乏。来自美国地质调查局（U.S. Geological Survey, USGS）与南佛罗里达大学（University of South Florida, USF）的研究人员，针对楚科奇海与加拿大海盆开展了高分辨率参数测量，涵盖pCO₂、pH、总溶解无机碳（total dissolved inorganic carbon, DIC）、总碱度（total alkalinity, TA）及碳酸根离子（CO₃²⁻），填补了北极碳循环变异研究中的关键信息空白。2010年8月，研究团队借助多参数无机碳分析仪（Multiparameter Inorganic Carbon Analyzer, MICA），沿总长9450千米的测线，完成了超过22000组大气与海水pCO₂、pH及DIC的原位测量。此外，研究人员还采集了240份离散表层海水样本。上述数据集正被用于刻画区域pCO₂、pH及碳酸盐矿物饱和度状态，并构建相应数值模型。研究团队将呈现基于该数据集生成的高分辨率三维可视化成果图。