A large-amplitude meander of the shelfbreak front during summer south of New England : observations from the Shelfbreak PRIMER experiment


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dc.contributor.author Gawarkiewicz, Glen G.
dc.contributor.author Brink, Kenneth H.
dc.contributor.author Bahr, Frank B.
dc.contributor.author Beardsley, Robert C.
dc.contributor.author Caruso, Michael J.
dc.contributor.author Lynch, James F.
dc.contributor.author Chiu, Ching-Sang
dc.date.accessioned 2010-06-02T18:18:05Z
dc.date.available 2010-06-02T18:18:05Z
dc.date.issued 2004-03-04
dc.identifier.citation Journal of Geophysical Research 109 (2004): C03006 en_US
dc.identifier.uri http://hdl.handle.net/1912/3568
dc.description Author Posting. © American Geophysical Union, 2004. 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 109 (2004): C03006, doi:10.1029/2002JC001468. en_US
dc.description.abstract In order to examine spatial and temporal variability of the shelfbreak front during peak stratification, repeated surveys using a towed undulating vehicle (SeaSoar) are used to describe the evolution of shelfbreak frontal structure during 26 July to 1 August 1996 south of New England. Spatial correlation (e-folding) scales for the upper 60 m of the water column were generally between 8 and 15 km for temperature, salinity, and velocity. Temporal correlation scales were about 1 day. The frontal variability was dominated by the passage of a westward propagating meander that had a wavelength of 40 km, a propagation speed of 0.11 m s−1, and an amplitude of 15 km (30 km from crest to trough). Along-front geostrophic velocities (referenced to a shipboard acoustic Doppler current profilers) were as large as 0.45 m s−1, although subject to significant along-front variations. The relative vorticity within the jet was large, with a maximum 0.6 of the local value of the Coriolis parameter. Seaward of the front, a small detached eddy consisting of shelf water was present with a diameter of approximately 15 km. Ageostrophic contributions to the velocity field are estimated to be as large as 0.3 m s−1 in regions of sharp curvature within the meander. These observations strongly suggest that during at least some time periods, shelfbreak exchange is nonlinear (large Rossby number) and dominated by features on a horizontal scale of order 10 km. en_US
dc.description.sponsorship This work was performed under grants N-00014-95-1-0575 and N-00014-98-1-0059. as part of the ONR Shelfbreak PRIMER Initiative. Some additional analysis and writing was done under ONR grants N-00014-00-1-0931 and N-00014-01-1-0247. 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/10.1029/2002JC001468
dc.subject Shelfbreak front en_US
dc.subject Cross-shelf exchange en_US
dc.subject Frontal dynamics en_US
dc.title A large-amplitude meander of the shelfbreak front during summer south of New England : observations from the Shelfbreak PRIMER experiment en_US
dc.type Article en_US

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