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    Gulf Stream Transport Variability at Periods of Decades

    Source: Journal of Physical Oceanography:;2001:;Volume( 031 ):;issue: 005::page 1304
    Author:
    Sturges, W.
    ,
    Hong, B. G.
    DOI: 10.1175/1520-0485(2001)031<1304:GSTVAP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Variability of sea level on the offshore side of the Gulf Stream has been estimated with a wind-forced numerical model. The difference in sea level between the model and coastal tide gauges therefore provides an estimate of variability of the Gulf Stream. These results can be compared with direct measurements of transport; the agreement is surprisingly good. Transport estimates are then made for sections offshore of four major tide stations along the U.S. East Coast. When data since World War II are used, the spectrum of sea level at the coast appears to peak at periods of ?150?250 mo. The difference signal (ocean minus coast), however, which the authors interpret as transport variability, has a weakly red spectrum. Power decreases at somewhat less than f?1 at periods just less than ?500 months but decreases strongly at periods less than ?150 months. The low-frequency variability arises primarily from the influx of open ocean Rossby waves. The large variance at low frequencies suggests that measurements of the transport of western boundary currents do not have many degrees of freedom; measurements made many years apart may vary substantially because of this localized variability. Sea level at the coast is coherent over long distances, but the incoming Rossby wave radiation from the open ocean has a relatively short north?south scale. These results emphasize that transport measured at one location along the coast may be incoherent with transport at locations only ?200 km away. As a result, measurements at one location will in general not be representative of transport along the entire coast.
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      Gulf Stream Transport Variability at Periods of Decades

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    contributor authorSturges, W.
    contributor authorHong, B. G.
    date accessioned2017-06-09T14:54:31Z
    date available2017-06-09T14:54:31Z
    date copyright2001/05/01
    date issued2001
    identifier issn0022-3670
    identifier otherams-29432.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4166659
    description abstractVariability of sea level on the offshore side of the Gulf Stream has been estimated with a wind-forced numerical model. The difference in sea level between the model and coastal tide gauges therefore provides an estimate of variability of the Gulf Stream. These results can be compared with direct measurements of transport; the agreement is surprisingly good. Transport estimates are then made for sections offshore of four major tide stations along the U.S. East Coast. When data since World War II are used, the spectrum of sea level at the coast appears to peak at periods of ?150?250 mo. The difference signal (ocean minus coast), however, which the authors interpret as transport variability, has a weakly red spectrum. Power decreases at somewhat less than f?1 at periods just less than ?500 months but decreases strongly at periods less than ?150 months. The low-frequency variability arises primarily from the influx of open ocean Rossby waves. The large variance at low frequencies suggests that measurements of the transport of western boundary currents do not have many degrees of freedom; measurements made many years apart may vary substantially because of this localized variability. Sea level at the coast is coherent over long distances, but the incoming Rossby wave radiation from the open ocean has a relatively short north?south scale. These results emphasize that transport measured at one location along the coast may be incoherent with transport at locations only ?200 km away. As a result, measurements at one location will in general not be representative of transport along the entire coast.
    publisherAmerican Meteorological Society
    titleGulf Stream Transport Variability at Periods of Decades
    typeJournal Paper
    journal volume31
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(2001)031<1304:GSTVAP>2.0.CO;2
    journal fristpage1304
    journal lastpage1312
    treeJournal of Physical Oceanography:;2001:;Volume( 031 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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