nerc.ac.uk

Solibore induced slope mixing in the Faroe-Shetland Channel

Inall, M.; Van Haren, H.; Huthnance, J. M.. 2006 Solibore induced slope mixing in the Faroe-Shetland Channel. [Other] In: 2006 Ocean Sciences Meeting, Honolulu, Hawaii, 20-24 February 2006. OS11J-06 [abstract].

Full text not available from this repository. (Request a copy)

Abstract/Summary

Very recent measurements made on the eastern flank of the Faroe-Shetland Channel have revealed intense and prolonged periods of highly non-linear internal wave activity at the intersection of the interface between Arctic and Atlantic origin waters with the continental slope at a depth of 600m. An array of 10 moorings was deployed between 7th and 21st September 2005 in a "cross" formation of dimension 5km oriented along the slope, centred on 60.2N 4.7W in a water depth of 600m. At this location the Scotland-Faroes branch of the North Atlantic inflow to the Arctic Mediterranean flows north-eastward as a slope current above modified North Atlantic water masses recirculating in the channel and above the south-westward flowing Arctic origin water masses. Repeated, lowered ADCP casts revealed intensified tidal currents below the main thermocline; with rising bands of maximum shear at the dominant M2 tidal period coincident with the region of maximum stratification. Moored ADCP and temperature records show many cases when near-bed temperature and velocity exhibit sharp changes followed by packets of solitons of elevation propagating up-slope. For 8 consecutive tidal cycles, the soliton packets appeared to be quasi-phase locked to the semi-diurnal frequency. Frequently the solitons were not rank ordered, indicative of intense dissipation of the leading wave. In some instances soliton-induced non-hydrostatic pressure changes were measured. In this paper we describe in detail the cross-slope propagation and along-slope variation of these deep tidal bores and solitons of elevation as they pass through the mooring array antenna: we also discuss their generation mechanism and energetics of mixing and energy loss.

Item Type: Publication - Conference Item (Other)
Programmes: Oceans 2025 > Biodiversity and ecosystem functioning
Additional Information. Not used in RCUK Gateway to Research.: CD-ROM, 4 3/4 in.
Additional Keywords: FAERO SHETLAND CHANNEL; SEDIMENT TRANSPORT; FRONTS; JETS; TURBULENCE; DIFFUSION; MIXING; SHELF SEAS FAEROE SHETLAND CHANNEL; SEDIMENT TRANSPORT; FRONTS; JETS; TURBULENCE; DIFFUSION; MIXING PROCESSES; SHELF SEAS
NORA Subject Terms: Marine Sciences
Date made live: 20 Oct 2008 11:19
URI: http://nora.nerc.ac.uk/id/eprint/2076

Actions (login required)

View Item View Item