Program and Agenda

Abstract

ON THE COHERENCY OF THE NORWEGIAN ATLANTIC SLOPE CURRENT

The aim of this study is to elucidate the dynamics controlling the coherency of the topographically locked Norwegian Atlantic Slope Current; the main conveyor of warm Atlantic waters to the Arctic. Based on a 20-year satellite-altimetry record and an isobath-following geostrophic approach, we resolve the spatio-temporal variability of the barotropic transport all the way from Svinøy to the Barents Sea Opening. The along-isobath transport becomes invaluable when put in terms of coherency, and shows that on seasonal to interannual time scales the slope current is indeed coherent. However, on short time scales the coherency shows a sustained decrease downstream of Lofoten. The greatly enhanced eddy kinetic energy along the Lofoten escarpment and cross-slope eddy fluxes into the Basin interior appear to be the candidate mechanisms for damping and diffusing the transport signal. Thus, insights concerning realistic eddy fluxes as well as area–volume distribution of Atlantic Water in the Lofoten Basin are prerequisites for climate models to resolve the Atlantic Water transports to the Arctic.

Authors

Léon Chafik, L. C., Stockholm University, Department of Meteorology, Sweden, leon@misu.su.se

Johan Nilsson, J. N., Stockholm University, Department of Meteorology, Sweden, nilsson@misu.su.se

Øystein Skagseth, Ø. S., Marine Research Institute, Norway, oystein.skagseth@imr.no

Details

Oral presentation

Session #:124
Date: 2/26/2014
Time: 09:15
Location: 312

Presentation is given by student: Yes