Directly measured mid-depth circulation in the northeastern North Atlantic Ocean

Bower, A.S.; Le Cann, B.; Rossby, T.; Zenk, W.; Gould, J.; Speer, K.; Richardson, P.L.; Prater, M.D.; Zhang, H-M.. 2002 Directly measured mid-depth circulation in the northeastern North Atlantic Ocean. Nature, 419 (6907). 603-607.

Full text not available from this repository.


The circulation of water masses in the northeastern North Atlantic Ocean has a strong influence on global climate owing to the northward transport of warm subtropical water to high latitudes. But the ocean circulation at depths below the reach of satellite observations is difficult to measure, and only recently have comprehensive, direct observations of whole ocean basins been possible. Here we present quantitative maps of the absolute velocities at two levels in the northeastern North Atlantic as obtained from acoustically tracked floats. We find that most of the mean flow transported northward by the Gulf Stream system at the thermocline level (about 600 m depth) remains within the subpolar region, and only relatively little enters the Rockall trough or the Nordic seas. Contrary to previous work, our data indicate that warm, saline water from the Mediterranean Sea reaches the high latitudes through a combination of narrow slope currents and mixing processes. At both depths under investigation, currents cross the Mid-Atlantic Ridge preferentially over deep gaps in the ridge, demonstrating that sea-floor topography can constrain even upper-ocean circulation patterns.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 0028-0836
Date made live: 09 Jun 2004 +0 (UTC)

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...