The circulation of North Atlantic Deep Water at 16°N, 2000-2003

Details The circulation of North Atlantic Deep Water at 16°N, 2000-2003 The circulation of North Atlantic Deep Water at 16°N, 2000-2003

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114305r&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 14, CiteID L14305

Physics

2

Oceanography: Physical: General Circulation, Oceanography: Physical: Currents, Oceanography: Physical: Western Boundary Currents

Scientific paper

The circulation of North Atlantic Deep Water (NADW) at 16°N is studied with chlorofluorocarbon (CFC) and current measurements in 2000, 2002 and 2003. The transport of the Deep Western Boundary Current (DWBC) ranges from 25.6 to 28.9 Sv in 2000 and 2002. CFC concentrations in the DWBC increased by ~30% per year during that period. In 2003, the DWBC was weak and the main CFC increase between 2002 and 2003 occurred offshore of the DWBC. For all three repeats, a major drop in the CFC concentrations of the NADW took place at 55°W. This was also found in the distributions of salinity and oxygen. The region west of 55°W was characterized by a predominantly southward flow. The lowest CFC concentrations were found above the Mid-Atlantic Ridge, where the zonal and meridional velocities were small and no preference of flow direction could be detected.

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