Wind-induced interannual variability of sea level slope, along-shelf flow, and surface salinity on the Northwest Atlantic shelf

dc.contributor.author Li, Yun
dc.contributor.author Ji, Rubao
dc.contributor.author Fratantoni, Paula S.
dc.contributor.author Chen, Changsheng
dc.contributor.author Hare, Jonathan A.
dc.contributor.author Davis, Cabell S.
dc.contributor.author Beardsley, Robert C.
dc.date.accessioned 2014-06-27T17:58:43Z
dc.date.available 2014-10-22T08:57:25Z
dc.date.issued 2014-04-16
dc.description Author Posting. © American Geophysical Union, 2014. 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: Oceans 119 (2014): 2462–2479, doi:10.1002/2013JC009385. en_US
dc.description.abstract In this study, we examine the importance of regional wind forcing in modulating advective processes and hydrographic properties along the Northwest Atlantic shelf, with a focus on the Nova Scotian Shelf (NSS)-Gulf of Maine (GoM) region. Long-term observational data of alongshore wind stress, sea level slope, and along-shelf flow are analyzed to quantify the relationship between wind forcing and hydrodynamic responses on interannual time scales. Additionally, a simplified momentum balance model is used to examine the underlying mechanisms. Our results show significant correlation among the observed interannual variability of sea level slope, along-shelf flow, and alongshore wind stress in the NSS-GoM region. A mechanism is suggested to elucidate the role of wind in modulating the sea level slope and along-shelf flow: stronger southwesterly (northeastward) winds tend to weaken the prevailing southwestward flow over the shelf, building sea level in the upstream Newfoundland Shelf region, whereas weaker southwesterly winds allow stronger southwestward flow to develop, raising sea level in the GoM region. The wind-induced flow variability can influence the transport of low-salinity water from the Gulf of St. Lawrence to the GoM, explaining interannual variations in surface salinity distributions within the region. Hence, our results offer a viable mechanism, besides the freshening of remote upstream sources, to explain interannual patterns of freshening in the GoM. en_US
dc.description.embargo 2014-10-16 en_US
dc.description.sponsorship This work was supported by NOAA’s Fisheries and the Environment Program, Grant #12-03 and through NOAA Cooperative Agreement NA09OAR4320129. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research: Oceans 119 (2014): 2462–2479 en_US
dc.identifier.doi 10.1002/2013JC009385
dc.identifier.uri https://hdl.handle.net/1912/6713
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.relation.uri https://doi.org/10.1002/2013JC009385
dc.subject Wind en_US
dc.subject Sea level en_US
dc.subject Flow en_US
dc.subject Salinity en_US
dc.subject Interannual variability en_US
dc.subject Northwest Atlantic shelf en_US
dc.title Wind-induced interannual variability of sea level slope, along-shelf flow, and surface salinity on the Northwest Atlantic shelf en_US
dc.type Article en_US
dspace.entity.type Publication
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