In the Arctic, large amounts of black carbon (BC) are released into river water and transported to the oceans as dissolved BC (DBC). However, the cycling and fate of DBC in the ocean is poorly understood. Here, DBC, dissolved organic carbon (DOC), absorbance, and δ¹⁸O were analyzed to examine the spatial characteristics and removal of DBC in the western Arctic Ocean and the Bering Sea during the boreal summer. DBC concentrations ranged from 0.67 to 4.18 μmol-C L⁻¹. In the sea-ice free regions, high DBC and DOC concentrations and a254 values corresponded to high δ¹⁸O-derived meteoric water contents, indicating that river discharge dominated their spatial patterns. By contrast, sea-ice meltwater (SIM) appeared to dilute DBC and DOC in SIM impacted waters (SIM > 3.5%). The departure of DBC from conservative mixing lines suggested that 47–84% of riverine DBC was removed over the shelves with 7–23% transported to the upper Canada Basin. These results suggest that shelf regions are crucial sites for riverine DBC removal that modulate the delivery of DBC to the open Arctic Ocean.

在北极，大量的黑碳（BC）被释放到河水中，并以溶解的BC（DBC）的形式运到海洋。但是，人们对DBC在海洋中的循环和命运知之甚少。这里，DBC，溶解的有机碳（DOC），吸光率，和δ ¹⁸ ö分析寒带夏季审查北冰洋西部和白令海的空间特性并除去DBC的。DBC浓度在0.67至4.18μmol-CL ^-1之间。在海冰免费区域，高DBC和DOC的浓度和一个254个值对应于高δ ¹⁸O来源的大气水含量，表明河流流量主导了它们的空间格局。相比之下，海冰融水（SIM）似乎会稀释受SIM影响的水中的DBC和DOC（SIM> 3.5％）。DBC与保守混合线的偏离表明，在架子上除去了47–84％的河流DBC，而7–23％的河道DBC被输送到了加拿大上游盆地。这些结果表明，陆架区域是河流DBC去除的关键地点，这些区域调节了DBC向开放的北冰洋的输送。