Modeling winter circulation under landfast ice : the interaction of winds with landfast ice


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dc.contributor.author Kasper, Jeremy L.
dc.contributor.author Weingartner, Thomas J.
dc.date.accessioned 2012-05-08T19:17:11Z
dc.date.available 2012-10-04T08:39:30Z
dc.date.issued 2012-04-04
dc.identifier.citation Journal of Geophysical Research 117 (2012): C04006 en_US
dc.identifier.uri http://hdl.handle.net/1912/5177
dc.description Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 117 (2012): C04006, doi:10.1029/2011JC007649. en_US
dc.description.abstract Idealized models and a simple vertically averaged vorticity equation illustrate the effects of an upwelling favorable wind and a spatially variable landfast ice cover on the circulation beneath landfast ice. For the case of no along-shore variations in ice, upwelling favorable winds seaward of the ice edge result in vortex squashing beneath the landfast ice leading to (1) large decreases in coastal and ice edge sea levels, (2) cross-shore sea level slopes and weak (<~.05 m s−1) under-ice currents flowing upwind, (3) strong downwind ice edge jets, and (4) offshore transport in the under-ice and bottom boundary layers of the landfast ice zone. The upwind under-ice current accelerates quickly within 2–4 days and then slows as cross-shore transport gradually decreases the cross-shore sea level slope. Near the ice edge, bottom boundary layer convergence produces ice edge upwelling. Cross-ice edge exchanges occur in the surface and above the bottom boundary layer and reduce the under-ice shelf volume by 15% in 10 days. Under-ice along-shore pressure gradients established by along- and cross-shore variations in ice width and/or under-ice friction alter this basic circulation pattern. For a landfast ice zone of finite width and length, upwelling-favorable winds blowing seaward of and transverse to the ice boundaries induce downwind flow beneath the ice and generate vorticity waves that propagate along-shore in the Kelvin wave direction. Our results imply that landfast ice dynamics, not included explicitly herein, can effectively convert the long-wavelength forcing of the wind into shorter-scale ocean motions beneath the landfast ice. en_US
dc.description.sponsorship J.K. was supported by the Prince William Sound Oil Spill Recovery Institute (OSRI), Alaska Sea Grant in cooperation with the Center for Global Change and the UAF Graduate School. Additional support was provided to J.K. and T.W. by the U.S. BOEMRE through the University of Alaska Coastal Marine Institute (Contract 1435-01-02-CA-85294) and by the Office of Naval Research through the National Oceanographic Partnership Program (grant N00014-07-1- 1040). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2011JC007649
dc.subject Coastal circulation en_US
dc.subject Ice edge upwelling en_US
dc.subject Ice ocean interaction en_US
dc.subject Landfast ice en_US
dc.subject Sea ice en_US
dc.title Modeling winter circulation under landfast ice : the interaction of winds with landfast ice en_US
dc.type Article en_US
dc.description.embargo 2012-10-04 en_US
dc.identifier.doi 10.1029/2011JC007649

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