Impact of periodic intermediary flows on submarine melting of a Greenland glacier

dc.contributor.author Sciascia, R.
dc.contributor.author Cenedese, Claudia
dc.contributor.author Nicolì, D.
dc.contributor.author Heimbach, Patrick
dc.contributor.author Straneo, Fiamma
dc.date.accessioned 2015-01-07T18:49:21Z
dc.date.available 2015-04-24T09:08:20Z
dc.date.issued 2014-10-24
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): 7078–7098, doi:10.1002/2014JC009953. en_US
dc.description.abstract The submarine melting of a vertical glacier front, induced by an intermediary circulation forced by periodic density variations at the mouth of a fjord, is investigated using a nonhydrostatic ocean general circulation model and idealized laboratory experiments. The idealized configurations broadly match that of Sermilik Fjord, southeast Greenland, a largely two layers system characterized by strong seasonal variability of subglacial discharge. Consistent with observations, the numerical results suggest that the intermediary circulation is an effective mechanism for the advection of shelf anomalies inside the fjord. In the numerical simulations, the advection mechanism is a density intrusion with a velocity which is an order of magnitude larger than the velocities associated with a glacier-driven circulation. In summer, submarine melting is mostly influenced by the discharge of surface runoff at the base of the glacier and the intermediary circulation induces small changes in submarine melting. In winter, on the other hand, submarine melting depends only on the water properties and velocity distribution at the glacier front. Hence, the properties of the waters advected by the intermediary circulation to the glacier front are found to be the primary control of the submarine melting. When the density of the intrusion is intermediate between those found in the fjord's two layers, there is a significant reduction in submarine melting. On the other hand, when the density is close to that of the bottom layer, only a slight reduction in submarine melting is observed. The numerical results compare favorably to idealized laboratory experiments with a similar setup. en_US
dc.description.embargo 2015-04-24 en_US
dc.description.sponsorship Support to C. Cenedese and F. Straneo was given by the National Science Foundation project OCE-1130008. C. Cenedese received support also from the WHOI Arctic Research Initiative. R. Sciascia and P. Heimbach are supported in part by NSF project OCE-1129746. Additional funding for P. Heimbach comes through NASA's project NNH11ZDA001N-IDS A.28. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research: Oceans 119 (2014): 7078–7098 en_US
dc.identifier.doi 10.1002/2014JC009953
dc.identifier.uri https://hdl.handle.net/1912/7019
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.relation.uri https://doi.org/10.1002/2014JC009953
dc.subject Fjord dynamics en_US
dc.subject Ice-ocean modeling en_US
dc.subject Glacier melting en_US
dc.subject Numerical model en_US
dc.subject Laboratory experiment en_US
dc.title Impact of periodic intermediary flows on submarine melting of a Greenland glacier en_US
dc.type Article en_US
dspace.entity.type Publication
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