dc.contributor.author | Randelhoff, Achim | |
dc.contributor.author | Fer, Ilker | |
dc.contributor.author | Sundfjord, Arild | |
dc.date.accessioned | 2017-08-15T12:32:23Z | |
dc.date.available | 2017-08-15T12:32:23Z | |
dc.date.issued | 2017-04 | |
dc.Published | Randelhoff, Fer I, Sundfjord A. Turbulent upper-ocean mixing affected by meltwater layers during Arctic summer. Journal of Physical Oceanography. 2017;47(4):835-853 | eng |
dc.identifier.issn | 0022-3670 | en_US |
dc.identifier.uri | https://hdl.handle.net/1956/16285 | |
dc.description.abstract | Every summer, intense sea ice melt around the margins of the Arctic pack ice leads to a stratified surface layer, potentially without a traditional surface mixed layer. The associated strengthening of near-surface stratification has important consequences for the redistribution of near-inertial energy, ice–ocean heat fluxes, and vertical replenishment of nutrients required for biological growth. The authors describe the vertical structure of meltwater layers and quantify their seasonal evolution and their effect on turbulent mixing in the oceanic boundary layer by analyzing more than 450 vertical profiles of velocity microstructure in the seasonal ice zone north of Svalbard. The vertical structure of the density profiles can be summarized by an equivalent mixed layer depth hBD, which scales with the depth of the seasonal stratification. As the season progresses and melt rates increase, hBD shoals following a robust pattern, implying stronger vertical stratification, weaker vertical eddy diffusivity, and reduced vertical extent of the mixing layer, which is bounded by hBD. Through most of the seasonal pycnocline, the vertical eddy diffusivity scales inversely with buoyancy frequency (Kρ ∝ N−1). The presence of mobile sea ice alters the magnitude and vertical structure of turbulent mixing primarily through stronger and shallower stratification, and thus vertical eddy diffusivity is greatly reduced under sea ice. This study uses these results to develop a quantitative model of surface layer turbulent mixing during Arctic summer and discuss the impacts of a changing sea ice cover. | en_US |
dc.language.iso | eng | eng |
dc.publisher | American Meteorological Society | en_US |
dc.title | Turbulent upper-ocean mixing affected by meltwater layers during Arctic summer | en_US |
dc.type | Peer reviewed | |
dc.type | Journal article | |
dc.date.updated | 2017-07-24T08:34:42Z | |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | Copyright 2017 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. All AMS journals and monograph publications are registered with the Copyright Clearance Center (http://www.copyright.com). Questions about permission to use materials for which AMS holds the copyright can also be directed to the AMS Permissions Officer at permissions@ametsoc.org. Additional details are provided in the AMS Copyright Policy statement, available on the AMS website (http://www.ametsoc.org/CopyrightInformation) | en_US |
dc.identifier.doi | https://doi.org/10.1175/jpo-d-16-0200.1 | |
dc.identifier.cristin | 1474576 | |
dc.source.journal | Journal of Physical Oceanography | |
dc.relation.project | Norges forskningsråd: 229786 | |