Energetic plumes over the western Ross Sea continental slope

LDEO Publication: 
Publication Type  Journal Article
Year of Publication  2004
Authors  Gordon, A. L.; Zambianchi, E.; Orsi, A.; Visbeck, M.; Giulivi, C. F.; Whitworth, T.; Spezie, G.
Journal Title  Geophysical Research Letters
Volume  31
Issue  21
Pages  -
Journal Date  Nov 4
ISBN Number  0094-8276
Accession Number  ISI:000225030700001
LDEO Publication Number  6664
Key Words  water; circulation; model; ocean

[ 1] Rapid descent of dense Drygalski Trough ( western Ross Sea, Antarctica) shelf water over the continental slope, within 100 to 250 m thick benthic plumes, is described. Speeds of up to 1.0 m/s are recorded flowing at an average angle of 35degrees to the isobaths, entraining ambient Lower Circumpolar Deep Water en route. This process is predominant in determining the concentration and placement of the shelf water injected into the deep sea as a precursor Antarctic Bottom Water. Nonetheless, a 4-hour duration pulse of undiluted shelf water was observed at depth ( 1407 m) directly north of the Drygalski Trough, moving at around 90 degrees to isobaths, and at a speed of 1.4 m/s. Thus the export of Ross Sea shelf water to the deep sea is accomplished within plumes descending at moderate angle to isobaths, punctuated by rapid downhill cascades.


870CDTimes Cited:12Cited References Count:12

URL  <Go to ISI>://000225030700001
DOI  Doi 10.1029/2004gl020785