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dc.contributor.authorJackson, Rebecca H.  Concept link
dc.contributor.authorStraneo, Fiamma  Concept link
dc.date.accessioned2016-11-01T18:36:36Z
dc.date.available2016-11-01T18:36:36Z
dc.date.issued2016-09-01
dc.identifier.citationJournal of Physical Oceanography 46 (2016): 2735-2768en_US
dc.identifier.urihttps://hdl.handle.net/1912/8491
dc.descriptionAuthor Posting. © American Meteorological Society, 2016. 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 46 (2016): 2735-2768, doi:10.1175/JPO-D-15-0134.1.en_US
dc.description.abstractIn Greenland’s glacial fjords, heat and freshwater are exchanged between glaciers and the ocean. Submarine melting of glaciers has been implicated as a potential trigger for recent glacier acceleration, and observations of ocean heat transport are increasingly being used to infer the submarine melt rates. The complete heat, salt, and mass budgets that underlie such methods, however, have been largely neglected. Here, a new framework for exploring glacial fjord budgets is developed. Building on estuarine studies of salt budgets, the heat, salt, and mass transports through the fjord are decomposed, and new equations for calculating freshwater fluxes from submarine meltwater and runoff are presented. This method is applied to moored records from Sermilik Fjord, near the terminus of Helheim Glacier, to evaluate the dominant balances in the fjord budgets and to estimate freshwater fluxes. Throughout the year, two different regimes are found. In the nonsummer months, advective transports are balanced by changes in heat/salt storage within their ability to measure; freshwater fluxes cannot be inferred as a residual. In the summer, a mean exchange flow emerges, consisting of inflowing Atlantic water and outflowing glacially modified water. This exchange transports heat toward the glacier and is primarily balanced by changes in storage and latent heat for melting ice. The total freshwater flux increases over the summer, reaching 1200 ± 700 m3 s−1 of runoff and 1500 ± 500 m3 s−1 of submarine meltwater from glaciers and icebergs in August. The methods and results highlight important components of fjord budgets, particularly the storage and barotropic terms, that have been not been appropriately considered in previous estimates of submarine melting.en_US
dc.description.sponsorshipThe data collection and analysis was funded by NSF Grants ARC-0909373, OCE-113008, and OCE-1434041.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JPO-D-15-0134.1
dc.subjectGeographic location/entityen_US
dc.subjectEstuariesen_US
dc.subjectGlaciersen_US
dc.subjectCirculation/ Dynamicsen_US
dc.subjectCoastal flowsen_US
dc.subjectAtm/Ocean Structure/ Phenomenaen_US
dc.subjectFreshwateren_US
dc.subjectSnowmelt/icemelten_US
dc.subjectObservational techniques and algorithmsen_US
dc.subjectIn situ oceanic observationsen_US
dc.titleHeat, salt, and freshwater budgets for a glacial fjord in Greenlanden_US
dc.typeArticleen_US
dc.identifier.doi10.1175/JPO-D-15-0134.1


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