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    Ventilation Rates Estimated from Tracers in the Presence of Mixing

    Source: Journal of Physical Oceanography:;2007:;Volume( 037 ):;issue: 011::page 2599
    Author:
    Hall, Timothy M.
    ,
    Haine, Thomas W. N.
    ,
    Waugh, Darryn W.
    ,
    Holzer, Mark
    ,
    Terenzi, Francesca
    ,
    LeBel, Deborah A.
    DOI: 10.1175/2006JPO3471.1
    Publisher: American Meteorological Society
    Abstract: The intimate relationship among ventilation, transit-time distributions, and transient tracer budgets is analyzed. To characterize the advective?diffusive transport from the mixed layer to the interior ocean in terms of flux we employ a cumulative ventilation-rate distribution, Φ(τ), defined as the one-way mass flux of water that resides at least time τ in the interior before returning. A one-way (or gross) flux contrasts with the net advective flux, often called the subduction rate, which does not accommodate the effects of mixing, and it contrasts with the formation rate, which depends only on the net effects of advection and diffusive mixing. As τ decreases Φ(τ) increases, encompassing progressively more one-way flux. In general, Φ is a rapidly varying function of τ (it diverges at small τ), and there is no single residence time at which Φ can be evaluated to fully summarize the advective?diffusive flux. To reconcile discrepancies between estimates of formation rates in a recent GCM study, Φ(τ) is used. Then chlorofluorocarbon data are used to bound Φ(τ) for Subtropical Mode Water and Labrador Sea Water in the North Atlantic Ocean. The authors show that the neglect of diffusive mixing leads to spurious behavior, such as apparent time dependence in the formation, even when transport is steady.
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      Ventilation Rates Estimated from Tracers in the Presence of Mixing

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    contributor authorHall, Timothy M.
    contributor authorHaine, Thomas W. N.
    contributor authorWaugh, Darryn W.
    contributor authorHolzer, Mark
    contributor authorTerenzi, Francesca
    contributor authorLeBel, Deborah A.
    date accessioned2017-06-09T16:17:51Z
    date available2017-06-09T16:17:51Z
    date copyright2007/11/01
    date issued2007
    identifier issn0022-3670
    identifier otherams-65248.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206452
    description abstractThe intimate relationship among ventilation, transit-time distributions, and transient tracer budgets is analyzed. To characterize the advective?diffusive transport from the mixed layer to the interior ocean in terms of flux we employ a cumulative ventilation-rate distribution, Φ(τ), defined as the one-way mass flux of water that resides at least time τ in the interior before returning. A one-way (or gross) flux contrasts with the net advective flux, often called the subduction rate, which does not accommodate the effects of mixing, and it contrasts with the formation rate, which depends only on the net effects of advection and diffusive mixing. As τ decreases Φ(τ) increases, encompassing progressively more one-way flux. In general, Φ is a rapidly varying function of τ (it diverges at small τ), and there is no single residence time at which Φ can be evaluated to fully summarize the advective?diffusive flux. To reconcile discrepancies between estimates of formation rates in a recent GCM study, Φ(τ) is used. Then chlorofluorocarbon data are used to bound Φ(τ) for Subtropical Mode Water and Labrador Sea Water in the North Atlantic Ocean. The authors show that the neglect of diffusive mixing leads to spurious behavior, such as apparent time dependence in the formation, even when transport is steady.
    publisherAmerican Meteorological Society
    titleVentilation Rates Estimated from Tracers in the Presence of Mixing
    typeJournal Paper
    journal volume37
    journal issue11
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2006JPO3471.1
    journal fristpage2599
    journal lastpage2611
    treeJournal of Physical Oceanography:;2007:;Volume( 037 ):;issue: 011
    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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