Significant calcium enrichment relative to seawater was observed in bulk and size-segregated aerosols in the marine atmospheric boundary layer over the Arctic Ocean in summer. The calcium enrichment factor generally increased with decreasing particle size (aerodynamic diameter) in the fine mode (particle size <1.8 μm), especially within the particle size ranges of 1.8 μm to 0.56 μm and 0.18 μm to 0.1 μm. Potassium was slightly enriched and showed a similar trend of enrichment in fine mode particles. No positive enrichment was observed for magnesium. Calcium bound to certain organic compounds and possibly calcareous debris from marine organisms may have contributed to the calcium enrichment in aerosols. Model results predict that observed calcium enrichments would increase hygroscopic growth in both coarse (10 μm and 5.6 μm) and fine (0.56 μm and 1 μm) aerosol particles. Possible alteration of this model result due to interactions with anions notwithstanding, increases in hygroscopic growth would be particularly important in the Arctic summer when sea-salts constitute the major fraction of aerosol dry mass. This study provides unique insights into ocean-atmosphere chemical interactions in the high-latitude Arctic Ocean.

夏季，在北冰洋上空的海洋边界层中，散装的和尺寸分离的气溶胶中相对于海水有明显的钙富集。钙富集因子通常在精细模式下（粒径<1.8μm）随粒径（空气动力学直径）的减小而增加，尤其是在1.8μm至0.56μm和0.18μm至0.1μm的粒径范围内。钾略微富集，并且在细模式颗粒中富集趋势相似。没有观察到镁的正富集。与某些有机化合物结合的钙以及可能来自海洋生物的钙质碎屑可能有助于气溶胶中钙的富集。模型结果预测，观察到的钙富集将增加粗粒（10μm和5.6μm）和细粒（0。56μm和1μm）气溶胶颗粒。尽管由于与阴离子的相互作用，该模型的结果可能会发生变化，但在北极夏季，海盐构成了气溶胶干物质的主要部分时，吸湿性增长的增加尤为重要。这项研究提供了对高纬度北冰洋中海洋与大气化学相互作用的独特见解。