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The Shelf Circulation of the Bellingshausen Sea

Schulze Chretien, L. M. and Thompson, A. F. and Flexas, M. M. and Speer, K. and Swaim, N. and Oelerich, R. and Ruan, X. and Schubert, R. and LoBuglio, C. (2021) The Shelf Circulation of the Bellingshausen Sea. Journal of Geophysical Research. Oceans, 126 (5). Art. No. e2020JC016871. ISSN 2169-9275. doi:10.1029/2020jc016871. https://resolver.caltech.edu/CaltechAUTHORS:20210507-095912338

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Abstract

Over recent decades, the West Antarctic Ice Sheet has experienced rapid thinning of its floating ice shelves as well as grounding line retreat across its marine‐terminating glaciers. The transport of warm Modified Circumpolar Deep Water (MCDW) onto the continental shelf, extensively documented along the West Antarctic Peninsula (WAP), and in the Amundsen Sea, has been identified as the key process for inducing these changes. The Bellingshausen Sea sits between the Amundsen Sea and the northern part of the WAP, but its oceanic properties remain remarkably under‐studied compared to surrounding regions. Here, we present observations collected from a hydrographic survey of the Bellingshausen Sea continental shelf in austral summer 2019. Using a combination of ship‐based and glider‐based CTD and lowered ADCP observations, we show that submarine troughs provide topographically steered pathways for MCDW from the shelf break toward deep embayments and ultimately under floating ice shelves. Warm MCDW enters the continental shelf at the deepest part of the Belgica Trough and flows onshore along the eastern side of the trough. Modification of these shoreward‐flowing waters by glacial melt is estimated by calculating meltwater fractions using an optimal multiparameter analysis. Meltwater is found to be elevated at the western edge of both the Latady and Belgica troughs. Meltwater distributions, consistent with other diagnostics, suggest a recirculation in each trough with modified waters eventually flowing westward upon leaving the Belgica Trough. Our results show that the Bellingshausen Sea is a critical part of the larger West Antarctic circulation system, linking the WAP and the Amundsen Sea.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2020jc016871DOIArticle
https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0210639Related ItemData
ORCID:
AuthorORCID
Schulze Chretien, L. M.0000-0002-9668-5213
Thompson, A. F.0000-0003-0322-4811
Flexas, M. M.0000-0002-0617-3004
Swaim, N.0000-0001-9005-6750
Ruan, X.0000-0003-1240-1584
Additional Information:© 2021. American Geophysical Union. Issue Online: 05 May 2021; Version of Record online: 05 May 2021; Accepted manuscript online: 29 April 2021; Manuscript accepted: 23 April 2021; Manuscript revised: 21 April 2021; Manuscript received: 08 October 2020. The authors acknowledge essential contributions from the captain and crew of the R/V Nathaniel B. Palmer as well as the Antarctic Support Contract staff during NBP19‐01. This work was supported by the National Science Foundation. A. F. Thompson, X. Ruan, and M. M. Flexas were supported by NSF OPP‐1644172 and the David and Lucille Packard Foundation. L. M. Schulze Chretien, K. Speer, N. Swaim, R. Schubert, and C. LoBuglio were supported by NSF OPP‐1643679. R. Oelerich is supported by the COMPASS project from the European Research Council under the European Union’s Horizon 2020 research and innovation program (grant agreement no 741120). We are grateful for comments from three reviewers that substantially improved this manuscript. Data Availability Statement: All data used in this study are available at https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0210639.
Funders:
Funding AgencyGrant Number
NSFOPP‐1644172
David and Lucile Packard FoundationUNSPECIFIED
NSFOPP‐1643679
European Research Council (ERC)741120
Issue or Number:5
DOI:10.1029/2020jc016871
Record Number:CaltechAUTHORS:20210507-095912338
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210507-095912338
Official Citation:Schulze Chretien, L. M., Thompson, A. F., Flexas, M. M., Speer, K., Swaim, N., Oelerich, R., et al. (2021). The shelf circulation of the Bellingshausen Sea. Journal of Geophysical Research: Oceans, 126, e2020JC016871. https://doi.org/10.1029/2020JC016871
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109004
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 May 2021 17:26
Last Modified:07 May 2021 17:26

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