Connectivity between Siberian river runoff and the lower limb of the Atlantic Meridional Overturning Circulation

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-09-26 DOI:10.1002/lno.12696
Caroline V. B. Gjelstrup, Paul G. Myers, Craig M. Lee, Kumiko Azetsu‐Scott, Colin A. Stedmon
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Abstract

Freshwater from the Arctic participates in the globally important Atlantic Meridional Overturning Circulation (AMOC). We use high‐resolution, in situ observations of dissolved organic matter (DOM) fluorescence to trace the origins of freshwater and organic carbon in the densest component of the AMOC, namely Denmark Strait Overflow Water (DSOW). We find a distinct terrestrial DOM signal in DSOW and trace it upstream to the Siberian shelves in the Arctic Ocean. This implies a riverine origin of freshwater in DSOW. We estimate that the Siberian Shelf water contribution constitutes approximately 1% of DSOW. Ocean circulation modeling confirms the inferred pathway and highlights Denmark Strait as an important location for the entrainment of the riverine signal into DSOW. Our proposed method can be deployed on a range of observing systems to elucidate freshwater dispersion across the Arctic and subarctic, thereby contributing to the broader discussion on freshwater impacts and organic carbon sequestration in the AMOC.
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西伯利亚河流径流与大西洋经向翻转环流下缘之间的联系
来自北极的淡水参与了具有全球重要性的大西洋经向翻转环流(AMOC)。我们利用对溶解有机物(DOM)荧光的高分辨率原位观测,追溯了淡水和有机碳在 AMOC 最密集部分(即丹麦海峡溢流水(DSOW))中的来源。我们在丹麦海峡溢流水中发现了明显的陆地 DOM 信号,并将其追溯到北冰洋的西伯利亚大陆架。这意味着 DSOW 中的淡水来源于河流。我们估计,西伯利亚陆架水约占 DSOW 的 1%。海洋环流建模证实了推断的路径,并强调丹麦海峡是河流信号进入 DSOW 的重要地点。我们提出的方法可用于一系列观测系统,以阐明淡水在整个北极和亚北极地区的扩散,从而为更广泛地讨论淡水影响和北极海洋观测系统的有机碳固存问题做出贡献。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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