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2002 LAPCOD Meeting
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Lagrangian measurements in the midlatitude Northeastern North Atlantic
B. Le Cann(1), A. Bower(2), K. Speer(3), P. Richardson(2), A. Serpette(4) and F. Colas (1)
(1)CNRS (Brest, France), (2)WHOI (Woods Hole, USA), (3)FSU (Tallahassee, USA), (4)SHOM (Brest, France)
blecann@univ-brest.fr(Abstract received for session A)
ABSTRACT
During the past decade, several Lagrangian acoustic float experiments took place in the Northeastern North Atlantic. These were aimed at the study of the characteristics of the circulation of the major watermasses of the region, including the Mediterranean Water (MW: AMUSE, ACCE and ARCANE experiments), the North Atlantic Central Water (NACW: ARCANE and POMME experiments) and the Labrador Sea Water (LSW: EUROFLOAT and SFB experiments).
The collected datasets are under analysis, and zero-order fields have been derived (Bower et al, 2002; poster to be presented). We present here selected results from these experiments to depict the vertical structure and evolution mesoscale features in the intergyre area of the Northeastern North Atlantic. We will notably show new results related to:
- "Northern Meddies": These are recently discovered (Paillet et al, 1999, 2002) varieties of the Meddies commonly found south of 40°N. They exhibit different characteristics and examples of generation, displacements and other behaviours (such as collision with seamounts) will be shown.
- "Central Water Eddies": These eddies are seen to be more robust than previously anticipated, and examples of long-lived anticyclones will be presented.
These eddies are seen to interact, through merging, or, if the eddies are at different levels, by coming into vertical alignment, and also via baroclinic dipole formation. Deep topography plays an important role in eddy displacements and some effects will be shown.
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2002 LAPCOD Meeting, Key Largo, Florida, December 12-16, 2000