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Drifter Behavior on the Oregon–Washington Shelf during Downwelling-Favorable Winds

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Abstract
  • Drifters released offshore of Oregon during predominantly downwelling favorable alongshore winds during three different deployments (October 1994, January 1998, and September 1998) display similar behavior: after being advected around in the offshore eddy field, they move onshore to a particular isobath and are advected poleward alongshore, without coming ashore. Numerical modeling results suggest that this may be due to downwelling circulation creating a marginally stable density gradient on the shelf inshore of the downwelling front, thereby increasing the vertical eddy diffusivity, which reduces the effective cross-shelf Ekman transport to nearly zero. The downwelling front itself is accompanied by a poleward jet, which carries drifters rapidly to the north. This behavior is consistent with previous modeling results.
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  • Austin, Jay A., John A. Barth, 2002: Drifter Behavior on the Oregon–Washington Shelf during Downwelling-Favorable Winds. Journal of Physical Oceanography, 32(11), 3132–3144.
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Journal Volume
  • 32
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  • 11
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  • Support for this research came from National Science Foundation Grants (OCE-9314370, OCE-9730639, OCE-0000733), NOAA Grants (NA67RJ0151, NA86OP0589), and a National Oceanographic Partnership Program Grant (N00014-98-1- 0787). JAA received support from the Center for Coastal Physical Oceanography at Old Dominion University.
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