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Mixing rates and vertical heat fluxes north of Svalbard from Arctic winter to spring

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Meyer, A ORCID: 0000-0003-0447-795X, Fer, I, Sundfjord, A and Peterson, AK 2017 , 'Mixing rates and vertical heat fluxes north of Svalbard from Arctic winter to spring' , Journal of Geophysical Research: Oceans, vol. 122, no. 6 , pp. 4569-4586 , doi: 10.1002/2016JC012441.

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Abstract

Mixing and heat flux rates collected in the Eurasian Basin north of Svalbard during the N‐ICE2015 drift expedition are presented. The observations cover the deep Nansen Basin, the Svalbard continental slope, and the shallow Yermak Plateau from winter to summer. Mean quiescent winter heat flux values in the Nansen Basin are 2 W m−2 at the ice‐ocean interface, 3 W m−2 in the pycnocline, and 1 W m−2 below the pycnocline. Large heat fluxes exceeding 300 W m−2 are observed in the late spring close to the surface over the Yermak Plateau. The data consisting of 588 microstructure profiles and 50 days of high‐resolution under‐ice turbulence measurements are used to quantify the impact of several forcing factors on turbulent dissipation and heat flux rates. Wind forcing increases turbulent dissipation seven times in the upper 50 m, and doubles heat fluxes at the ice‐ocean interface. The presence of warm Atlantic Water close to the surface increases the temperature gradient in the water column, leading to enhanced heat flux rates within the pycnocline. Steep topography consistently enhances dissipation rates by a factor of four and episodically increases heat flux at depth. It is, however, the combination of storms and shallow Atlantic Water that leads to the highest heat flux rates observed: ice‐ocean interface heat fluxes average 100 W m−2 during peak events and are associated with rapid basal sea ice melt, reaching 25 cm/d.

Item Type: Article
Authors/Creators:Meyer, A and Fer, I and Sundfjord, A and Peterson, AK
Keywords: Arctic, ocean, sea-ice, mixing, heat flux, Yermak Plateau, N-ICE2015, turbulence, storm, topography, Atlantic water
Journal or Publication Title: Journal of Geophysical Research: Oceans
Publisher: Wiley-Blackwell Publishing Inc.
ISSN: 2169-9275
DOI / ID Number: 10.1002/2016JC012441
Copyright Information:

Copyright 2017. The Authors. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) http://creativecommons.org/licenses/by-nc-nd/4.0/

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