Observations of the Ushant tidal front in September 2007

Type Article
Date 2009-04
Language English
Author(s) Le Boyer A.2, Cambon Gildas2, Daniault N.2, Herbette Steven2, Le Cann B.2, Marie Louis1, Morin P.3
Affiliation(s) 1 : IFREMER, Ctr Brest, CNRS, Lab Phys Oceans,IRD,UBO,UMR 6523, Plouzane, France.
2 : Univ Bretagne Occidentale, CNRS, IFREMER, Lab Phys Oceans,IRD,UBO,UMR 6523, Brest, France.
3 : UPMC, CNRS, UMR 7144, Biol Stn, Roscoff, France.
Source Continental Shelf Research (0278-4343) (Elsevier), 2009-04 , Vol. 29 , N. 8 , P. 1026-1037
DOI 10.1016/j.csr.2008.12.020
WOS© Times Cited 46
Keyword(s) Nutrients, Drifters, HF radars, Hydrology, Tidal mixing front, Shelf dynamics
Abstract The Ushant tidal front is the dominant feature of the summer season hydrological structure of the Iroise Sea. It separates tidally mixed coastal waters from thermally stratified open Celtic Sea waters. This article reports on observations made in September 2007 during two short cruises that took place aboard R/V "Cotes de la Manche", and gives a general account of the physical structure of the front along one cross-frontal transect. The data set comprises data from a 4 month ADCP mooring, short CTD/fluorescence/nutrients transects, Lagrangian drifter trajectories, and HF radar surface current measurements. One finding is that the surface and bottom fronts, being affected by different dynamical influences, are not necessarily coincident in the vertical. This entails that the opposite density gradients located above and below the thermocline depth do not necessarily compensate, and can each be associated with a significant surface geostrophic expression. A second finding is that mixing effects bear a very strong influence on the thermal structure of the warm-water intrusions associated with frontal cyclonic eddies of the kind described by Pingree [1978. Cyclonic eddies and cross-frontal mixing. journal of the Marine Biological Association of the United Kingdom 58 (4), 955-963]. (C) 2009 Elsevier Ltd. All rights reserved.
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