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Spatial variability of Antarctic Bottom Water in the Australian Antarctic Basin from 2018–2020 captured by Deep Argo

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Thomas, G, Purkey, SG, Roemmich, D, Foppert, A ORCID: 0000-0003-2958-1454 and Rintoul, SR ORCID: 0000-0002-7055-9876 2020 , 'Spatial variability of Antarctic Bottom Water in the Australian Antarctic Basin from 2018–2020 captured by Deep Argo' , Geophysical Research Letters, vol. 47, no. 23 , pp. 1-9 , doi: 10.1029/2020GL089467.

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Abstract

There are two varieties of Antarctic Bottom Water present in the Australian Antarctic Basin (AAB): locally produced Adélie Land Bottom Water (ALBW) and distantly produced Ross Sea Bottom Water (RSBW). Between 2014 and 2018, RSBW has rebounded from a multidecade freshening trend. The return of the salty RSBW to the AAB is revealed by six Deep Argo floats that have occupied the region from January of 2018 to March of 2020. The floats depict a zonal variation in temperature and salinity in the bottom waters of the AAB, driven by the inflow of RSBW. A simple Optimum Multiparameter Analysis based on potential temperature and salinity gives a sense of scale to the composition of the bottom waters, which are nearly 80% of the new, salty RSBW in the south-east corner of the basin by 2019 and generally less than 40% to the west closer to the ALBW outflow region and the abyssal plain.

Item Type: Article
Authors/Creators:Thomas, G and Purkey, SG and Roemmich, D and Foppert, A and Rintoul, SR
Keywords: Southern Ocean, Antarctic Bottom Water, overturning circulation
Journal or Publication Title: Geophysical Research Letters
Publisher: Amer Geophysical Union
ISSN: 0094-8276
DOI / ID Number: 10.1029/2020GL089467
Copyright Information:

© 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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