Biogeochemical River Runoff Drives Intense Coastal Arctic Ocean CO 2 Outgassing
Biogeochemical River Runoff Drives Intense Coastal Arctic Ocean CO 2 Outgassing
复制标题
生物地球化学河流径流导致北冰洋沿岸CO 2 强烈释放
DOI：
10.1029/2022gl102377
复制
发表时间：
2023
影响因子：
5.2
通讯作者：
Babin, M.
中科院分区：
文献类型：
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作者：
Bertin, C.;Carroll, D.;Menemenlis, D.;Dutkiewicz, S.;Zhang, H.;Matsuoka, A.;Tank, S.;Manizza, M.;Miller, C. E.;Babin, M.
北极变暖改变了营养物和有机物从陆地到海洋的通量，从而影响了海气碳交换。在这里，我们使用波弗特海（SBS）东南部的海洋生物地球化学模型来研究麦肯齐河生物地球化学排放在2000年至2019年期间调节海气二氧化碳通量的作用。六种生物地球化学排放成分的贡献导致 CO2 净释气量为 0.13 TgC yr−1，由于河流溶解的有机碳和无机碳，沿海 SBS 碳汇分别减少 0.23 和 0.4 TgC yr−1。高（低）排放量的年份会促进河流羽流释放（吸收）更多的二氧化碳。这些结果表明，麦肯齐河调节了 SBS 作为大气二氧化碳汇或源的能力。我们的工作表明，陆地与海洋生物地球化学耦合的准确模型表示对于评估当今北冰洋沿海海洋对快速变化的环境的响应至关重要。
Arctic warming alters land‐to‐sea fluxes of nutrients and organic matter, which impact air‐sea carbon exchange. Here we use an ocean‐biogeochemical model of the southeastern Beaufort Sea (SBS) to investigate the role of Mackenzie River biogeochemical discharge in modulating air‐sea CO2fluxes during 2000–2019. The contribution of six biogeochemical discharge constituents leads to a net CO2outgassing of 0.13 TgC yr−1, with a decrease in the coastal SBS carbon sink of 0.23 and 0.4 TgC yr−1due to riverine dissolved organic and inorganic carbon, respectively. Years with high (low) discharge promote more CO2outgassing (uptake) from the river plume. These results demonstrate that the Mackenzie River modulates the capacity of the SBS to act as a sink or source of atmospheric CO2. Our work suggests that accurate model representation of land‐to‐sea biogeochemical coupling can be critical for assessing present‐day Arctic coastal ocean response to the rapidly changing environment.