Antarctic intermediate water mass formation in ocean general circulation models

Sorensen, Jacob V. T. and Ribbe, Joachim and Shaffer, Gary (2001) Antarctic intermediate water mass formation in ocean general circulation models. Journal of Physical Oceanography, 31 (11). pp. 3295-3311. ISSN 1520-0485


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[Abstract]: Antarctic Intermediate Water is formed at the high mid-latitudes of the Southern Ocean. In many ocean general circulation model simulations with coarse resolution and a z-coordinate, a mid-depth salinity minimum characteristic of this intermediate water is reproduced. However, for the real ocean it remains unclear which are the dominant processes in the formation of this water mass and which are the source regions for contributing surface waters. To elucidate such processes and quantify intermediate water formation rates, two experiments with an ocean general circulation model were conducted. In one experiment, the traditional parameterization of horizontal and vertical mixing was applied, while the second model included the Gent-McWilliams parameterization for an eddy-induced transport velocity. In the latter application, the production and meridional export of intermediate water was found to be larger than in the first experiment. Furthermore, mid-latitude convective mixing, which had been argued to be the main intermediate water mass formation mechanism was found to be not as important as in previous model results. Passive tracer experiments indicated that diapycnal mixing and circumpolar subduction might also play important roles as water mass formation processes in this particular ocean circulation model.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Deposited with special permission from publisher. Pre-print version of article, as made available here, differs in title from the Published version. Pre-print title: On Antarctic intermediate water mass formation in ocean general circulation models. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. The definitive version should be accessed from the publisher's site at the URL above.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:34
Last Modified: 02 Jul 2013 22:36
Uncontrolled Keywords: Southern Ocean; water masses; mode water; intermediate water; ocean general circulation modelling; Antarctic
Fields of Research : 04 Earth Sciences > 0405 Oceanography > 040503 Physical Oceanography
Identification Number or DOI: 10.1175/1520-0485(2001)031<3295:AIWMFI>2.0.CO;2

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