Recirculation of Canada Basin Deep Water in the Amundsen Basin, Arctic

Karam, Salar, Heuzé, Céline, Müller, Vasco and Zheng, Yixi (2023) Recirculation of Canada Basin Deep Water in the Amundsen Basin, Arctic. Journal of Physical Oceanography, 53 (11). pp. 2559-2574. ISSN 0022-3670

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Abstract

It is evident from hydrographic profiles in the Arctic Ocean that relatively warm and salty Canada Basin Deep Water (CBDW) flows over the Lomonosov Ridge into the Amundsen Basin, in the Eurasian Arctic. However, oceanographic data in the deep Arctic Ocean are scarce, making it difficult to analyze the spatial extent or the dynamics of this inflow. Here we present new hydrographic data from two recent expeditions as well as historical data from previous expeditions in the central Arctic. We use an end-member analysis to quantify the presence of CBDW in the Amundsen and Nansen Basins and infer new circulation pathways. We find that the inflow of CBDW is intermittent, and that it recirculates in the Amundsen Basin along the Gakkel Ridge. Although the forcing mechanisms for the inflow of CBDW into the Amundsen Basin remain unclear owing to the lack of continuous observations, we demonstrate that density-driven overflows, even intermittent, and the pressure gradient across the Lomonosov Ridge are unlikely drivers. We also find multiple deep eddies with a CBDW content of up to 600 g kg-1 and a vertical extent of up to 1200 m in the Amundsen Basin. The high CBDW content of these eddies suggests that they can efficiently trap CBDW and transport its heat and salt over long distances.

Item Type: Article
Additional Information: Funding Information: Acknowledgments. This work is funded by the Swedish Research Council, Grant 2018-03859, awarded to CH. Participation of SK in MOSAiC and SAS was supported by the Swedish Research Polar Secretariat. VM was funded by the EPICA project in the research theme “MARE:N - Polarfor-schung/MOSAiC” funded by the German Federal Ministry for Education and Research with funding 03F0889A. YZ acknowledges support from the China Scholarship Council, the University of East Anglia, the European Research Council (under H2020-EU.1.1.) Research Grant 741120: Climate-relevant Ocean Measurements and Processes on the Antarctic continental Shelf and Slope (COMPASS), and the NERC Research Grant NE/ W007045/1 NSFGEO-NERC: Collaborative Research: Accelerating Thwaites Ecosystem Impacts for the Southern Ocean (ARTEMIS). This work was carried out and data used in this manuscript were produced as part of MOSAiC with the tag MOSAiC20192020 (AWI_PS122_00). We thank all those who contributed to MOSAiC and made this endeavor possible (Nixdorf et al. 2021). We similarly thank all those who contributed to SAS, and in particular, the Swedish Polar Research Secretariat. Finally, we thank the two anonymous reviewers and the editor Yueng-Djern Lenn for their comments, which greatly improved this manuscript. Publisher Copyright: © 2023 American Meteorological Society.
Uncontrolled Keywords: arctic,boundary currents,eddies,intermediate waters,ocean,storage,oceanography ,/dk/atira/pure/subjectarea/asjc/1900/1910
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 22 Nov 2023 04:39
Last Modified: 22 Nov 2023 04:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/93717
DOI: 10.1175/JPO-D-22-0252.1

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