Observations of the Antarctic Slope Undercurrent in the southeastern Weddell Sea

Details Observations of the Antarctic Slope Undercurrent in the southeastern Weddell Sea Observations of the Antarctic Slope Undercurrent in the southeastern Weddell Sea

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713601c&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13601

Physics

1

Oceanography: General: Continental Shelf And Slope Processes (3002), Oceanography: General: Arctic And Antarctic Oceanography (9310, 9315), Oceanography: Physical: Currents, Oceanography: General: Water Masses, Cryosphere: Ice Shelves

Scientific paper

The Antarctic Slope Front presents a dynamical barrier between the cold Antarctic shelf waters in contact with ice shelves and the warmer subsurface waters offshore. Two hydrographic sections with full-depth current measurements were undertaken in January and February 2009 across the slope and shelf in the southeastern Weddell Sea. Southwestward surface-intensified currents of ˜30 cm s-1, and northeastward undercurrents of 6-9 cm s-1, were in thermal-wind balance with the sloping isopycnals across the front, which migrated offshore by 30 km in the time interval between the two sections. A mid-depth undercurrent on February 23 was associated with a 130-m uplift of the main pycnocline, bringing Warm Deep Water closer to the shelf break. This vertical displacement, comparable to that caused by seasonal variations in wind speed, implies that undercurrents may affect the exchanges between coastal and deep waters near the Antarctic continental margins.

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