Slantwise convection in the Irminger Sea

dc.contributor.author Le Bras, Isabela A.‐A.
dc.contributor.author Callies, Jörn
dc.contributor.author Straneo, Fiammetta
dc.contributor.author Biló, Tiago C.
dc.contributor.author Holte, James
dc.contributor.author Johnson, Helen L.
dc.date.accessioned 2023-04-19T19:24:56Z
dc.date.available 2023-04-19T19:24:56Z
dc.date.issued 2022-09-28
dc.description Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(10), (2022): e2022JC019071, https://doi.org/10.1029/2022jc019071.
dc.description.abstract The subpolar North Atlantic is a site of significant carbon dioxide, oxygen, and heat exchange with the atmosphere. This exchange, which regulates transient climate change and prevents large‐scale hypoxia throughout the North Atlantic, is thought to be mediated by vertical mixing in the ocean's surface mixed layer. Here we present observational evidence that waters deeper than the conventionally defined mixed layer are affected directly by atmospheric forcing in this region. When northerly winds blow along the Irminger Sea's western boundary current, the Ekman response pushes denser water over lighter water, potentially triggering slantwise convection. We estimate that this down‐front wind forcing is four times stronger than air–sea heat flux buoyancy forcing and can mix waters to several times the conventionally defined mixed layer depth. Slantwise convection is not included in most large‐scale ocean models, which likely limits their ability to accurately represent subpolar water mass transformations and deep ocean ventilation.
dc.description.sponsorship I. A.-A. Le Bras, F. Straneo, T. C. Biló, and J. Holte gratefully acknowledge the US National Science Foundation (NSF): this work was supported by grants OCE-1258823, OCE-1756272, OCE-1948335, and OCE-2038481. J. Callies gratefully acknowledges NSF support through grant OCE-1924354. H. L. Johnson was supported by the SNAP-DRAGON program (UK Natural Environment Research Council grant number NE/T013494/1).
dc.identifier.citation Le Bras, I., Callies, J., Straneo, F., Biló, T., Holte, J., & Johnson, H. (2022). Slantwise convection in the Irminger Sea. Journal of Geophysical Research: Oceans, 127(10), e2022JC019071.
dc.identifier.doi 10.1029/2022jc019071
dc.identifier.uri https://hdl.handle.net/1912/65980
dc.publisher American Geophysical Union
dc.relation.uri https://doi.org/10.1029/2022jc019071
dc.title Slantwise convection in the Irminger Sea
dc.type Article
dspace.entity.type Publication
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