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    The Leeuwin Current off Western Australia, 1986–1987

    Source: Journal of Physical Oceanography:;1991:;Volume( 021 ):;issue: 002::page 323
    Author:
    Smith, Robert L.
    ,
    Huyer, Adriana
    ,
    Godfrey, J. Stuart
    ,
    Church, John A.
    DOI: 10.1175/1520-0485(1991)021<0323:TLCOWA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The Leeuwin Current in the Indian Ocean off Western Australia differs from the other major eastern boundary currents, e.g., California Current, since it flows rapidly poleward against the prevailing equatorward wind. The first large-scale study of the Leeuwin Current was conducted between North West Cape (22°S) and the south-western corner of Australia (35°S) from September 1986 to August 1987. As part of this Leeuwin Current Interdisciplinary Experiment (LUCIE), current meters were deployed along the shelf-edge (from 22° to 35°S) and across the shelf and upper slope (at 29.5° and 34°S), and CTD surveys were made out from the shelf at several latitudes. Except for about one month (January) the flow between the surface and about 250 m was strongly poleward within 100 km of the shelf-edge, with a poleward transport of about 5 Sv (Sv ≡ 6 m3 s?1). The 325-day mean currents at the shelf-edge were poleward at about 10 cm s?1, opposing a mean equatorward wind stress of 0.3 dyn cm?2. The monthly mean current over the upper slope exceeded 50 cm s?1 poleward at times and had a 325-day mean of 30 cm s?1; an equatorward undercurrent existed below about 300 m and had a 325-day mean of 10 cm s?1 at 450 m. The strong, narrow Leeuwin Current depends on the large-scale alongshore gradient of geopotential anomaly at the sea surface, with a value greater than 2 ? 106 m s?2, which is anomalously large compared to other eastern boundary regions. The onshore geostrophic transport exceeded the offshore Ekman transport induced by the equatorward wind stress, and was presumably balanced over the upper slope and outer shelf by the offshore Ekman transport near the bottom under the Leeuwin Current. The seasonal variation in the strength of the Leeuwin Current seemed to be the result of variations in the wind stress and not in the alongshore pressure gradient, which had little seasonal dependence.
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      The Leeuwin Current off Western Australia, 1986–1987

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4164784
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    contributor authorSmith, Robert L.
    contributor authorHuyer, Adriana
    contributor authorGodfrey, J. Stuart
    contributor authorChurch, John A.
    date accessioned2017-06-09T14:49:56Z
    date available2017-06-09T14:49:56Z
    date copyright1991/02/01
    date issued1991
    identifier issn0022-3670
    identifier otherams-27745.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4164784
    description abstractThe Leeuwin Current in the Indian Ocean off Western Australia differs from the other major eastern boundary currents, e.g., California Current, since it flows rapidly poleward against the prevailing equatorward wind. The first large-scale study of the Leeuwin Current was conducted between North West Cape (22°S) and the south-western corner of Australia (35°S) from September 1986 to August 1987. As part of this Leeuwin Current Interdisciplinary Experiment (LUCIE), current meters were deployed along the shelf-edge (from 22° to 35°S) and across the shelf and upper slope (at 29.5° and 34°S), and CTD surveys were made out from the shelf at several latitudes. Except for about one month (January) the flow between the surface and about 250 m was strongly poleward within 100 km of the shelf-edge, with a poleward transport of about 5 Sv (Sv ≡ 6 m3 s?1). The 325-day mean currents at the shelf-edge were poleward at about 10 cm s?1, opposing a mean equatorward wind stress of 0.3 dyn cm?2. The monthly mean current over the upper slope exceeded 50 cm s?1 poleward at times and had a 325-day mean of 30 cm s?1; an equatorward undercurrent existed below about 300 m and had a 325-day mean of 10 cm s?1 at 450 m. The strong, narrow Leeuwin Current depends on the large-scale alongshore gradient of geopotential anomaly at the sea surface, with a value greater than 2 ? 106 m s?2, which is anomalously large compared to other eastern boundary regions. The onshore geostrophic transport exceeded the offshore Ekman transport induced by the equatorward wind stress, and was presumably balanced over the upper slope and outer shelf by the offshore Ekman transport near the bottom under the Leeuwin Current. The seasonal variation in the strength of the Leeuwin Current seemed to be the result of variations in the wind stress and not in the alongshore pressure gradient, which had little seasonal dependence.
    publisherAmerican Meteorological Society
    titleThe Leeuwin Current off Western Australia, 1986–1987
    typeJournal Paper
    journal volume21
    journal issue2
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1991)021<0323:TLCOWA>2.0.CO;2
    journal fristpage323
    journal lastpage345
    treeJournal of Physical Oceanography:;1991:;Volume( 021 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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