Cascading, slope mixing

Cascading and mixing on the slope will be investigated by using a range of models from semi-analytic to 3D unstructured grids and non-hydrostatic. We will evaluate the sensitivity of cascading to topography, to ambient and initial conditions, and how slope mixing and its effects vary with context, forcing and internal waves. Validated 3-D models will be used to estimate cascading fluxes in areas with observations, and their contribution to oceanic water masses relative to the original volume of water formed at the shelf edge. Sensitivity to climate factors will be modelled.

In 2007/08, Faroe-Shetland Channel 2005 data for internal waves and mixing are being analysed Gulf of Cadiz (GO) data were obtained in April-May 2007 and are being analysed.

In future it is planned to analyse Oceans 2025 Theme 1 Antarctic and Rockall data, and to obtain data for Svalbard dense-water flow down the slope, in 2008 with SAMS.

Cascading shown by potential density two weeks apart at 73N in the Barents Sea, with a large increase on the shallow shelf and down-slope cascading; ice formation rejects salt which increases the shallow-water salinity. (UoP/AARI).

2005 mooring array for currents, temperature and turbulence in the Faroe-Shetland Channel. CTD profiles and current measurements from the ship were also obtained.

ADD EQUATION HERE The array of current u, turbulence u' and temperature T measurements spanning 750-1000 m depth in the Gulf of Cadiz, April-May 2007.

This work is in collaboration SAMS, the University of Plymoutb, NIOZ, GO project partners and prospectively the University of Bergen from 2008. Cascading studies build on an INTAS project Dense water flows off continental shelves.