Long-term moored array measurements of currents and hydrography over Georges Bank : 1994–1999


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dc.contributor.author Brink, Kenneth H.
dc.contributor.author Beardsley, Robert C.
dc.contributor.author Limeburner, Richard
dc.contributor.author Irish, James D.
dc.contributor.author Caruso, Michael J.
dc.date.accessioned 2009-11-24T18:35:10Z
dc.date.available 2009-11-24T18:35:10Z
dc.date.issued 2009-06-24
dc.identifier.uri http://hdl.handle.net/1912/3073
dc.description Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Progress In Oceanography 82 (2009): 191-223, doi:10.1016/j.pocean.2009.07.004. en_US
dc.description.abstract In conjunction with the GLOBEC (Global Ocean Ecosystems Dynamics) program, measurements of moored currents, temperature and salinity were made during 1994-1999 at locations in 76 m of water along the Southern Flank of Georges Bank and at the Northeastern Peak. The measurements concentrate on the biologically crucial winter and spring periods, and coverage during the fall is usually poorer. Current time series were completely dominated by the semidiurnal M2 tidal component, while other tidal species (including the diurnal K1 component) were also important. There was a substantial wind-driven component of the flow, which was linked, especially during the summer, to regional–scale response patterns. The current response at the Northeast Peak was especially strong in the 3-4 day period band, and this response is shown to be related to an amplifying topographic wave propagating eastward along the northern flank. Monthly mean flows on the southern flank are southwestward throughout the year, but strongest in the summertime. The observed tendency for summertime maximum along-bank flow to occur at depth is rationalized in terms of density gradients associated with a near-surface freshwater tongue wrapping around the Bank. Temperature and salinity time series demonstrate the presence, altogether about 25% of the time, of a number of intruding water masses. These intrusions could last anywhere from a couple days up to about a month. The sources of these intrusions can be broadly classified as the Scotian Shelf (especially during the winter), the Western Gulf of Maine (especially during the summer), and the deeper ocean south of Georges Bank (throughout the year). On longer time scales, the temperature variability is dominated by seasonal temperature changes. During the spring and summer, these changes are balanced by local heating or cooling, but wintertime cooling involves advective lateral transports as well. Salinity variations have weak, if any, seasonal variability, but are dominated by interannual changes that are related to regional- or basin-scale changes. All considered, Georges Bank temperature and salinity characteristics are found to be highly dependent on the surrounding waters, but many questions remain, especially in terms of whether intrusive events leave a sustained impact on Bank waters. en_US
dc.description.sponsorship This work took place as part of the GLOBEC Northwest Atlantic/Georges Bank field project, and was sponsored through NSF Biological Oceanography grants OCE- 80644500 and OCE- 80644501. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.relation.uri http://dx.doi.org/10.1016/j.pocean.2009.07.004
dc.subject Wind-driven circulation en_US
dc.subject Buoyancy-driven circulation en_US
dc.subject Stratification en_US
dc.subject Seasonal/interannual variability en_US
dc.title Long-term moored array measurements of currents and hydrography over Georges Bank : 1994–1999 en_US
dc.type Preprint en_US

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