Composition and variability of the Denmark Strait Overflow Water in a high-resolution numerical model hindcast simulation

dc.contributor.author Behrens, Erik
dc.contributor.author Våge, Kjetil
dc.contributor.author Harden, Benjamin E.
dc.contributor.author Biastoch, Arne
dc.contributor.author Böning, Claus W.
dc.date.accessioned 2017-07-05T17:38:17Z
dc.date.available 2017-10-04T08:55:04Z
dc.date.issued 2017-04-04
dc.description Author Posting. © American Geophysical Union, 2017. 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 122 (2017): 2830–2846, doi:10.1002/2016JC012158. en_US
dc.description.abstract The upstream sources and pathways of the Denmark Strait Overflow Water and their variability have been investigated using a high-resolution model hindcast. This global simulation covers the period from 1948 to 2009 and uses a fine model mesh (1/20°) to resolve mesoscale features and the complex current structure north of Iceland explicitly. The three sources of the Denmark Strait Overflow, the shelfbreak East Greenland Current (EGC), the separated EGC, and the North Icelandic Jet, have been analyzed using Eulerian and Lagrangian diagnostics. The shelfbreak EGC contributes the largest fraction in terms of volume and freshwater transport to the Denmark Strait Overflow and is the main driver of the overflow variability. The North Icelandic Jet contributes the densest water to the Denmark Strait Overflow and shows only small temporal transport variations. During summer, the net volume and freshwater transports to the south are reduced. On interannual time scales, these transports are highly correlated with the large-scale wind stress curl around Iceland and, to some extent, influenced by the North Atlantic Oscillation, with enhanced southward transports during positive phases. The Lagrangian trajectories support the existence of a hypothesized overturning loop along the shelfbreak north of Iceland, where water carried by the North Icelandic Irminger Current is transformed and feeds the North Icelandic Jet. Monitoring these two currents and the region north of the Iceland shelfbreak could provide the potential to track long-term changes in the Denmark Strait Overflow and thus also the AMOC. en_US
dc.description.embargo 2017-10-04 en_US
dc.description.sponsorship Norwegian Research Council Grant Number: 231647 en_US
dc.identifier.citation Journal of Geophysical Research: Oceans 122 (2017): 2830–2846 en_US
dc.identifier.doi 10.1002/2016JC012158
dc.identifier.uri https://hdl.handle.net/1912/9062
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.relation.uri https://doi.org/10.1002/2016JC012158
dc.subject North Atlantic en_US
dc.subject Denmark Strait en_US
dc.subject Overflow en_US
dc.subject Transport variability en_US
dc.subject Overturning en_US
dc.title Composition and variability of the Denmark Strait Overflow Water in a high-resolution numerical model hindcast simulation en_US
dc.type Article en_US
dspace.entity.type Publication
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