Spatial characteristics and removal of dissolved black carbon in the western Arctic Ocean and Bering Sea
Spatial characteristics and removal of dissolved black carbon in the western Arctic Ocean and Bering Sea
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DOI：
10.1016/j.gca.2021.04.024
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发表时间：
2021-05-11
影响因子：
5
通讯作者：
Wang, Bo
中科院分区：
文献类型：
--
作者：
Fang, Ziming;Yang, Weifeng;Wang, Bo
在北极，大量的黑碳（BC）被释放到河水中，并以溶解的BC（DBC）的形式被输送到海洋中。然而，对DBC在海洋中的循环和命运知之甚少。在这里，DBC，溶解有机碳（DOC），吸光度，和δ O-18进行了分析，以研究在北冰洋西部和白令海北部夏季的DBC的空间特征和去除。DBC浓度范围为0.67至4.18 μ mol-C L-1。在海冰区，高的DBC和DOC浓度和a254值对应于高三角洲O-18衍生的大气降水含量，表明河流流量占主导地位的空间格局。相比之下，海冰融水（SIM）似乎稀释了SIM影响的沃茨（SIM > 3.5%）中的DBC和DOC。从保守的混合线的DBC的偏离表明，47-84%的河流的DBC被删除的货架与7-23%的加拿大盆地上游。这些结果表明，大陆架地区是河流DBC去除的关键站点，调节DBC向开放的北冰洋的输送。(C)2021爱思唯尔有限公司保留所有权利。
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 delta O-18 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 mu mol-C L-1. In the sea-ice free regions, high DBC and DOC concentrations and a254 values corresponded to high delta O-18-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. (C) 2021 Elsevier Ltd. All rights reserved.