The Arctic Ocean CO2 Sink: Trends, Uncertainties, and the Impact of Sea Ice

IF 5.5 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Victoria R. Dutch, Dorothee C. E. Bakker, Alizée Roobaert, Peter Landschützer, Nicholas P. Roden, Mario Hoppema, Jan Kaiser
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引用次数: 0

Abstract

The Arctic Ocean covers 3 % of the Earth's surface but is estimated to contribute 5–14 % to the global ocean carbon sink. Sparse and unevenly distributed observations complicate our understanding of the size and the controlling mechanisms of this carbon sink. We adopt and advance the two-step neural network approach of Landschützer et al. (2016, https://doi.org/10.1002/2015gb005359; Self Organizing Map—Feed Forward Network) to improve region-specific reconstructions of the surface ocean partial pressure of carbon dioxide ( p $p$ ( CO 2 ${\text{CO}}_{2}$ )) in the Arctic Ocean and subsequently estimate the air-sea CO 2 ${\text{CO}}_{2}$ flux. Our study shows that biogeochemical properties previously selected as predictor variables for p $p$ ( CO 2 ${\text{CO}}_{2}$ ) at the global scale are not well suited to the Arctic Ocean and a sensitivity study reveals large differences in the size of the Arctic Ocean carbon sink depending on the choice of air-sea CO 2 ${\text{CO}}_{2}$ flux parameterization. This is most acute for those relating to sea ice cover, leading to a difference of up to 25 % (9.2–13.3 Pg C) in the total size of the Arctic Ocean carbon sink over the 32-year duration of the study.

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北冰洋二氧化碳汇:趋势、不确定性和海冰的影响
北冰洋覆盖了地球表面的3%,但据估计占全球海洋碳汇的5 - 14%。稀疏和不均匀分布的观测使我们对碳汇的大小和控制机制的理解复杂化。我们采用并推进了landsch tzer等人(2016,https://doi.org/10.1002/2015gb005359;自组织地图-前馈网络)改进北冰洋表层海洋二氧化碳分压(p$ p$ (CO 2 ${\text{CO}}_{2}$)的区域特定重建,并随后估算出北冰洋的温度大气-海洋二氧化碳${\文本{CO}}_{2}$通量。我们的研究表明,以前选择作为全球尺度p$ p$ (CO 2 ${\text{CO}}_{2}$)的预测变量的生物地球化学性质不太适合北冰洋,敏感性研究表明其存在较大的差异{\text{CO}}_{2}$通量参数化所决定的北冰洋碳汇大小的差异。这对于那些与海冰覆盖有关的碳汇来说是最严重的,导致在32年的研究期间,北冰洋碳汇总量的差异高达25% (9.2-13.3 Pg C)。
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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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