Dynamics of downwelling in an eddy-resolving convective basin
Spall, Michael A.
MetadataShow full item record
The mean downwelling in an eddy-resolving model of a convective basin is concentrated near the boundary where eddies are shed from the cyclonic boundary current into the interior. It is suggested that the buoyancy-forced downwelling in the Labrador Sea and the Lofoten Basin is similarly concentrated in analogous eddy formation regions along their eastern boundaries. Use of a transformed Eulerian mean depiction of the density transport reveals the central role eddy fluxes play in maintaining the adiabatic nature of the flow in a nonperiodic region where heat is lost from the boundary current. The vorticity balance in the downwelling region is primarily between stretching of planetary vorticity and eddy flux divergence of relative vorticity, although a narrow viscous boundary layer is ultimately important in closing the regional vorticity budget. This overall balance is similar in some ways to the diffusive–viscous balance represented in previous boundary layer theories, and suggests that the downwelling in convective basins may be properly represented in low-resolution climate models if eddy flux parameterizations are adiabatic, identify localized regions of eddy formations, and allow density to be transported far from the region of eddy formations.
Author Posting. © American Meteorological Society, 2010. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 40 (2010): 2341–2347, doi:10.1175/2010JPO4465.1.
Suggested CitationJournal of Physical Oceanography 40 (2010): 2341–2347
Showing items related by title, author, creator and subject.
Pacini, Astrid; Pickart, Robert S.; Bahr, Frank B.; Torres, Daniel J.; Ramsey, Andree L.; Holte, James W.; Karstensen, Johannes; Oltmanns, Marilena; Straneo, Fiamma; Le Bras, Isabela Astiz; Moore, G. W. K.; de Jong, M. Femke (American Meteorological Society, 2020-09-18)The structure, transport, and seasonal variability of the West Greenland boundary current system near Cape Farewell are investigated using a high-resolution mooring array deployed from 2014 to 2018. The boundary current ...
Influences of time-dependent precipitation on water mass transformation, heat fluxes, and deep convection in marginal seas Yasuda, Yuki; Spall, Michael A. (American Meteorological Society, 2015-07)Influences of time-dependent precipitation on water mass transformation and heat budgets in an idealized marginal sea are examined using theoretical and numerical models. The equations proposed by Spall in 2012 are extended ...
Pickart, Robert S.; Spall, Michael A. (American Meteorological Society, 2007-09)The overturning and horizontal circulations of the Labrador Sea are deduced from a composite vertical section across the basin. The data come from the late-spring/early-summer occupations of the World Ocean Circulation ...