Turbulent high-latitude oceanic intrusions - details of non-smooth apparent isopycnal transport West of Svalbard.

van Haren, Hans and Greinert, Jens (2016) Turbulent high-latitude oceanic intrusions - details of non-smooth apparent isopycnal transport West of Svalbard. Open Access Ocean Dynamics, 66 (6). pp. 785-794. DOI 10.1007/s10236-016-0955-x.

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Abstract

Filament intrusions are observed in high-resolution temperature (T) measurements from a 100-m and several month-long mooring in the Fram Strait in around 400-m water depth at the continental slope West of Svalbard (Spitsbergen, Norway). In this dynamic environment, a wide variety of intrusive layers are observed with thicknesses between 5 and 80 m with warmer water between cooler waters above and below. The layers typically last from several hours up to 1 day, exceeding the local buoyancy period but not lasting as long as intrusive layers in the open ocean. The intrusions are a result of an intermingling of Arctic and North-Atlantic waters and generated in the basins interior and locally via internal wave steepening upon the sloping bottom. Freely propagating semidiurnal lunar internal tides cannot exist without background vorticity at these high latitudes. Strongly nonlinear turbulent bores are not observed at the tidal periodicity, but wave fronts occur at the sub-inertial frequency of dominant baroclinic instability. The fronts are in part associated with near-buoyancy frequency internal waves (breaking). The details of the moored T observations and their spectral content demonstrate the non-smooth, relatively turbulent development including convective overturning and shear-induced instabilities when intrusions disperse in presumably salinity-compensated isopycnal layers.

Document Type: Article
Additional Information: Data use requests can be directed to hans.van.haren@nioz.nl - WOS:000378002600002
Keywords: High-resolution temperature observations, West Svalbard, Poleward of critical lunar tidal latitude, Intrusions, High-frequency internal wave breaking, Non-smooth isopycnal dispersal, RV Helmer Hanssen
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems > DeepSea Monitoring
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10236-016-0955-x
ISSN: 1616-7341
Projects: PERGAMON
Contribution Number:
ProjectNumber
DSM19
Date Deposited: 20 May 2016 07:44
Last Modified: 01 Feb 2019 15:05
URI: http://oceanrep.geomar.de/id/eprint/32896

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