On the dynamics and water mass transformation of a boundary current connecting alpha and beta oceans

dc.contributor.author Lambert, Erwin
dc.contributor.author Eldevik, Tor
dc.contributor.author Spall, Michael A.
dc.date.accessioned 2018-11-01T15:29:55Z
dc.date.available 2018-11-01T15:29:55Z
dc.date.issued 2018-10-19
dc.description Author Posting. © American Meteorological Society, 2018. 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 48 (2018): 2457-2475, doi:10.1175/JPO-D-17-0186.1. en_US
dc.description.abstract A subpolar marginal sea, like the Nordic seas, is a transition zone between the temperature-stratified subtropics (the alpha ocean) and the salinity-stratified polar regions (the beta ocean). An inflow of Atlantic Water circulates these seas as a boundary current that is cooled and freshened downstream, eventually to outflow as Deep and Polar Water. Stratification in the boundary region is dominated by a thermocline over the continental slope and a halocline over the continental shelves, separating Atlantic Water from Deep and Polar Water, respectively. A conceptual model is introduced for the circulation and water mass transformation in a subpolar marginal sea to explore the potential interaction between the alpha and beta oceans. Freshwater input into the shelf regions has a slight strengthening effect on the Atlantic inflow, but more prominently impacts the water mass composition of the outflow. This impact of freshwater, characterized by enhancing Polar Water outflow and suppressing Deep Water outflow, is strongly determined by the source location of freshwater. Concretely, perturbations in upstream freshwater sources, like the Baltic freshwater outflow into the Nordic seas, have an order of magnitude larger potential to impact water mass transports than perturbations in downstream sources like the Arctic freshwater outflow. These boundary current dynamics are directly related to the qualitative stratification in transition zones and illustrate the interaction between the alpha and beta oceans. en_US
dc.description.sponsorship This research was supported by the Research Council of Norway project NORTH. Support for the publication was provided by the University of Bergen. Ocean Outlook has supported a research visit for EL to Woods Hole Oceanographic Institute where much of the current work has been carried out. Support forMAS was provided by the National Science Foundation Grant OCE-1558742. en_US
dc.identifier.citation Journal of Physical Oceanography 48 (2018): 2457-2475 en_US
dc.identifier.doi 10.1175/JPO-D-17-0186.1
dc.identifier.uri https://hdl.handle.net/1912/10675
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri https://doi.org/10.1175/JPO-D-17-0186.1
dc.subject Continental shelf/slope en_US
dc.subject Baroclinic flows en_US
dc.subject Boundary currents en_US
dc.subject Buoyancy en_US
dc.subject Freshwater en_US
dc.subject Thermohaline circulation en_US
dc.title On the dynamics and water mass transformation of a boundary current connecting alpha and beta oceans en_US
dc.type Article en_US
dspace.entity.type Publication
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