Oxygen isotope study of water masses in the Princess Elizabeth Trough, Antarctica

Frew, Russell D., Heywood, Karen J. ORCID: https://orcid.org/0000-0001-9859-0026 and Dennis, Paul F. ORCID: https://orcid.org/0000-0002-0307-4406 (1995) Oxygen isotope study of water masses in the Princess Elizabeth Trough, Antarctica. Marine Chemistry, 49 (2-3). pp. 141-153. ISSN 0304-4203

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Abstract

Data from a hydrographic survey located in the Princess Elizabeth Trough, near the Antarctic continent (63-65 ° S, 85 ° E) are presented and discussed. This region is covered by sea-ice for most of the year with the ice-edge retreating to the southern edge of the Trough during summer. Water samples were collected during the Austral summer, February 1993, to determine the ratio of the oxygen-18 to oxygen-16 isotope, δ18O. Four water bodies are characterised by their temperature, salinity and δ18O properties, Surface Water (0.0-1.2 ° C, 33.1-34.0, -0.39‰), Winter Water (-1.7 ° C, 34.4, -0.39‰), Warm Deep Water (2.0 ° C, 34.69, 0.02‰) and Bottom Water (-0.43 ° C, 34.669, -0.25‰). The Bottom Water is warmer, saltier and heavier isotopically than Weddell Sea Bottom Water (-0.9 ° C, 34.65, -0.29‰); and has T-S properties close to that of classical Antarctic Bottom Water (-0.4 ° C, 34.66). This Bottom Water is isotopically distinct from the Weddell Sea derived Bottom Water that ventilates the Indian ocean through the Kerguelen-Crozet gap. A mechanism for local formation of the Bottom Water involving freezing of Surface Water and entrainment of Warm Deep Water is described.

Item Type: Article
Uncontrolled Keywords: oceanography,chemistry(all),environmental chemistry,water science and technology ,/dk/atira/pure/subjectarea/asjc/1900/1910
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 20 May 2020 00:14
Last Modified: 22 Oct 2022 06:11
URI: https://ueaeprints.uea.ac.uk/id/eprint/75242
DOI: 10.1016/0304-4203(95)00003-A

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