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Vertical mixing at intermediate depths in the Arctic boundary current

Lenn, YD; Wiles, PJ; Torres-Valdes, S; Abrahamsen, EP; Rippeth, TP; Simpson, JH; Bacon, S; (2009) Vertical mixing at intermediate depths in the Arctic boundary current. Geophysical Research Letters , 36 , Article L05601. 10.1029/2008GL036792. Green open access

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Abstract

Microstructure and hydrographic observations, during September 2007 in the boundary current on the East Siberian continental slope, document upper ocean stratification and along-stream water mass changes. A thin warm surface layer overrides a shallow halocline characterized by a similar to 40-m thick temperature minimum layer beginning at similar to 30 m depth. Below the halocline, well-defined thermohaline diffusive staircases extended downwards to warm Atlantic Water intrusions found at 200-800 m depth. Observed turbulent eddy kinetic energy dissipations are extremely low (epsilon < 10(-6) W m(-3)), such that double diffusive convection dominates the vertical mixing in the upper-ocean. The diffusive convection heat fluxes F-H(dc) similar to 1 W m(-2), are an order of magnitude too small to account for the observed along-stream cooling of the boundary current. Our results implicate circulation patterns and the influence of shelf waters in the evolution of the boundary current waters. Citation: Lenn, Y. D., et al. (2009), Vertical mixing at intermediate depths in the Arctic boundary current, Geophys. Res. Lett., 36, L05601, doi:10.1029/2008GL036792.

Type: Article
Title: Vertical mixing at intermediate depths in the Arctic boundary current
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2008GL036792
Publisher version: http://dx.doi.org/10.1029/2008GL036792
Language: English
Additional information: Copyright 2009 by the American Geophysical Union
Keywords: OCEAN, TURBULENCE, BASIN, FLOW, SEAS
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Earth Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1338045
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