HLY1001_Averaged

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 data sets 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 Canada Basin that fill critical information gaps concerning Arctic carbon variability. A Multiparameter Inorganic Carbon Analyzer (MICA) was used to collect approximately 9,000 measurements of air and sea pCO2, pH, and DIC along a 11,447-km trackline in August and September 2011. In addition, over 500 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.现有模型预测，未来十年北冰洋将出现碳酸盐矿物不饱和状态。近期野外观测结果表明，在海冰消融规模达到峰值的夏末时节，北冰洋部分海域或许已处于碳酸盐矿物不饱和状态。然而，目前针对北冰洋碳酸盐系统参数的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）的研究人员在加拿大海盆开展了高分辨率参数测量，涵盖分压二氧化碳（pCO2）、pH、总溶解无机碳（total dissolved inorganic carbon, DIC）、总碱度（total alkalinity, TA）以及碳酸根离子（CO3^2-），填补了北冰洋碳循环变异性相关研究的关键信息空白。2011年8至9月，研究团队依托多参数无机碳分析仪（Multiparameter Inorganic Carbon Analyzer, MICA），在总长11447公里的测线上完成了约9000组大气与海水pCO2、pH及DIC的测量。此外，研究人员还采集了超过500份离散表层海水样本。上述数据正被用于表征并建模区域pCO2、pH及碳酸盐矿物饱和状态。届时将展示基于上述观测结果绘制的高分辨率三维图谱。