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

Frew, Russell D., Heywood, Karen J. and Dennis, Paul F. (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 Sep 2020 00:01
URI: https://ueaeprints.uea.ac.uk/id/eprint/75242
DOI: 10.1016/0304-4203(95)00003-A

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