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Strong export of Antarctic Bottom Water east of the Kerguelen plateau

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Title: Strong export of Antarctic Bottom Water east of the Kerguelen plateau
Authors: Fukamachi, Y. Browse this author
Rintoul, S. R. Browse this author
Church, J. A. Browse this author
Aoki, S. Browse this author
Sokolov, S. Browse this author
Rosenberg, M. A. Browse this author
Wakatsuchi, M. Browse this author
Issue Date: May-2010
Publisher: Nature Publishing Group
Journal Title: Nature Geoscience
Volume: 3
Issue: 5
Start Page: 327
End Page: 331
Publisher DOI: 10.1038/NGEO842
Abstract: The primary paths for the transport of Antarctic Bottom Water to the global ocean are the deep western boundary currents east of the Antarctic Peninsula and the Kerguelen plateau. Previous ship-based studies found evidence of the Kerguelen deep western boundary current in the distribution of water properties and velocity, but no long-term measurements exist to define the mean flow. Here we use results from a coherent array of eight current-meter moorings to reveal a narrow and intense equatorward flow extending throughout the water column. Two-year mean velocities exceed 20 cm s^[-1] at depths ∼3500 m, the strongest mean deep western boundary current flow yet observed at similar depths. The mean equatorward transport of water colder than 0℃ is 12.3±1.2 x 10^[6] m3 s^[-1], partially compensated by poleward flow of 6.0 x 10^[6] m3 s^[-1] mostly across the eastern end of the array. Below 0.2℃, the net transport is 8.0 x 10^[6] m3 s^[-1], in comparison to 1.9 x 10^[6] m3 s^[-1] in the boundary current carrying dense water from the Weddell Sea into the Atlantic north of the Falkland Plateau. The results confirm that the Kerguelen deep western boundary current is a significant pathway of the deep overturning circulation.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 深町 康

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