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    Instability of Two-Dimensional Themohaline Circulation

    Source: Journal of Physical Oceanography:;1996:;Volume( 026 ):;issue: 003::page 305
    Author:
    Vellinga, Michael
    DOI: 10.1175/1520-0485(1996)026<0305:IOTDTC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Two different two-dimensional models of the thermohaline circulation of the ocean have been used to study the loss of stability of a thermally dominated symmetrical two-cell circulation. Although the models differ in their momentum budget, their behavior was qualitatively similar: the symmetrical solution was found to lose its stability at a critical strength of the salinity forcing with respect to two asymmetrical solutions that are mirror images of each other. The supercritical pitchfork bifurcation that describes this process was calculated with a numerical continuation technique. An analysis of the linear stability of the system yields an eigenfunction structure that allows the identification of the processes causing the instability. For the current surface forcing and parameter values that put the system in a thermal regime, this physical mechanism can be understood from meridional advection of salt and beat anomalies alone. Ibis explains why the phenomenon of symmetry breaking is observed in such a wide range of studies and that model properties such as the choice of the convection scheme are only of quantitative importance.
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      Instability of Two-Dimensional Themohaline Circulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165606
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    contributor authorVellinga, Michael
    date accessioned2017-06-09T14:51:57Z
    date available2017-06-09T14:51:57Z
    date copyright1996/03/01
    date issued1996
    identifier issn0022-3670
    identifier otherams-28485.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165606
    description abstractTwo different two-dimensional models of the thermohaline circulation of the ocean have been used to study the loss of stability of a thermally dominated symmetrical two-cell circulation. Although the models differ in their momentum budget, their behavior was qualitatively similar: the symmetrical solution was found to lose its stability at a critical strength of the salinity forcing with respect to two asymmetrical solutions that are mirror images of each other. The supercritical pitchfork bifurcation that describes this process was calculated with a numerical continuation technique. An analysis of the linear stability of the system yields an eigenfunction structure that allows the identification of the processes causing the instability. For the current surface forcing and parameter values that put the system in a thermal regime, this physical mechanism can be understood from meridional advection of salt and beat anomalies alone. Ibis explains why the phenomenon of symmetry breaking is observed in such a wide range of studies and that model properties such as the choice of the convection scheme are only of quantitative importance.
    publisherAmerican Meteorological Society
    titleInstability of Two-Dimensional Themohaline Circulation
    typeJournal Paper
    journal volume26
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1996)026<0305:IOTDTC>2.0.CO;2
    journal fristpage305
    journal lastpage319
    treeJournal of Physical Oceanography:;1996:;Volume( 026 ):;issue: 003
    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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