The Western Boundary Undercurrent is a high-velocity, contour-following bottom current that flows southwesterly on the U.S. Atlantic continental margin. A high-velocity core of the Western Boundary Undercurrent is delineated by an analysis of underlying sediments, which are characterized by coarse particle sizes and efficiently aligned magnetic grains in a… (More)
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The fabric and texture of deep-sea sediments have been used to detect periods of high-velocity bottom-water flow through the Vema Channel in the south-west Atlantic Ocean. In addition, the alignment of the long axis of magnetic grains has been used to indicate the direction of bottom-water flow.
Particle size analyses of surface sediments in the Vema Channel reveal a spatial variation related to the present hydrography. Similar analyses of sediment deposited during the last ice age (18,000 years before the present) indicate a maximum shallowing of the upper limit of Antarctic Bottom Water (AABW) of about 100 meters, coupled with an increase in… (More)