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Seasonal transformation and spatial variability of water masses within MacKenzie Polynya, Prydz Bay

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Portela, E, Rintoul, SR ORCID: 0000-0002-7055-9876, Bestley, S ORCID: 0000-0001-9342-669X, Herraiz-Borreguero, L, van Wijk, E, McMahon, CR, Roquet, F and Hindell, M ORCID: 0000-0002-7823-7185 2021 , 'Seasonal transformation and spatial variability of water masses within MacKenzie Polynya, Prydz Bay' , Journal of Geophysical Research: Oceans, vol. 126, no. 12 , pp. 1-21 , doi: 10.1029/2021JC017748.

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Abstract

We provide a detailed description of the spatial distribution, seasonality and transformation of the main water masses within MacKenzie Polynya (MP) in Prydz Bay, East Antarctica, using data from instrumented southern elephant seals. Dense Shelf Water (DSW) formation in MP shows large spatial variability that is related to the (a) local bathymetry, (b) water column preconditioning from the presence/absence of different water masses, and (c) proximity to the Amery Ice Shelf meltwater outflow. MP exhibits sustained sea ice production and brine rejection (thus, salinity increase) from April to October. However, new DSW is only formed from June onward, when the mixed layer deepens and convection is strong enough to break the stratification set by Antarctic Surface Water above and Ice Shelf Water below. We found no evidence of DSW export from MP to Darnley polynya, as previously suggested. Rather, our observations suggest some DSW formed in Darnley Polynya may drain toward the western Prydz Bay. Then, DSW is exported offshore from Prydz Bay through the Prydz Channel. The interplay between sea ice formation, meltwater input, and sea floor topography is likely to explain why some coastal polynyas form more DSW than others, as well as the temporal variability in DSW formation within a particular polynya.

Item Type: Article
Authors/Creators:Portela, E and Rintoul, SR and Bestley, S and Herraiz-Borreguero, L and van Wijk, E and McMahon, CR and Roquet, F and Hindell, M
Keywords: polynya, Antarctic, dense shelf water, sea-ice formation, water mass transformation, Southern Ocean
Journal or Publication Title: Journal of Geophysical Research: Oceans
Publisher: Wiley-Blackwell Publishing Inc.
ISSN: 2169-9275
DOI / ID Number: 10.1029/2021JC017748
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© 2021. American Geophysical Union. All Rights Reserved

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