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    The Mesospheric Diabatic Circulation and the Parameterized Thermal Effect of Gravity Wave Breaking on the Circulation

    Source: Journal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 008::page 1093
    Author:
    Huang, Theresa Y. W.
    ,
    Smith, Anne K.
    DOI: 10.1175/1520-0469(1991)048<1093:TMDCAT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A calculation of the monthly mean diabatic circulation of the mesosphere is performed by using the thermodynamic and continuity equations with observed climatological data. Non-LTE CO2 cooling, ozone infrared cooling, and solar heating from ozone and molecular oxygen absorption are included in the calculation of the diabatic heating rate. During the solstices, a distinctive summer-to-winter flow is produced throughout most of the mesosphere. During the equinoxes, the flow is from the fall to spring hemisphere in the upper mesospheric region but predominantly poleward in the rest of the mesosphere. An attempt was made to include the thermal effects of gravity wave breaking in the energy budget to investigate their effect on the mean circulation. Various unknown coefficients needed for the wave breaking parameterization made it difficult to assess their exact effect. However, the residual circulation was found to be relatively insensitive to the effective Prandtl number chosen. For large elective Prandtl numbers, the direct thermal effect of gravity wave breaking on the mesospheric residual circulation is very small. An independent evaluation of the overall impact of gravity wave breaking on the thermal budget comes from the requirement that the globally averaged net mass flux across a pressure surface be zero. This mass balance condition is violated for an effective Prandtl number of unity, and is more closely adhered to for large Prandtl numbers. The momentum residual can be used to check the compatibility of the Lindzen's parameterized wave drag with the diabatic/residual circulation. These comparisons can also provide an alternative way of determining the amplitude coefficients and breaking level coefficients needed to estimate the gravity wave drag. The pararmeterized wave drag can be tuned to agree very well with the structure of the momentum residual during the solstices, but not so during the equinoxes.
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      The Mesospheric Diabatic Circulation and the Parameterized Thermal Effect of Gravity Wave Breaking on the Circulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156760
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    • Journal of the Atmospheric Sciences

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    contributor authorHuang, Theresa Y. W.
    contributor authorSmith, Anne K.
    date accessioned2017-06-09T14:30:20Z
    date available2017-06-09T14:30:20Z
    date copyright1991/04/01
    date issued1991
    identifier issn0022-4928
    identifier otherams-20522.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156760
    description abstractA calculation of the monthly mean diabatic circulation of the mesosphere is performed by using the thermodynamic and continuity equations with observed climatological data. Non-LTE CO2 cooling, ozone infrared cooling, and solar heating from ozone and molecular oxygen absorption are included in the calculation of the diabatic heating rate. During the solstices, a distinctive summer-to-winter flow is produced throughout most of the mesosphere. During the equinoxes, the flow is from the fall to spring hemisphere in the upper mesospheric region but predominantly poleward in the rest of the mesosphere. An attempt was made to include the thermal effects of gravity wave breaking in the energy budget to investigate their effect on the mean circulation. Various unknown coefficients needed for the wave breaking parameterization made it difficult to assess their exact effect. However, the residual circulation was found to be relatively insensitive to the effective Prandtl number chosen. For large elective Prandtl numbers, the direct thermal effect of gravity wave breaking on the mesospheric residual circulation is very small. An independent evaluation of the overall impact of gravity wave breaking on the thermal budget comes from the requirement that the globally averaged net mass flux across a pressure surface be zero. This mass balance condition is violated for an effective Prandtl number of unity, and is more closely adhered to for large Prandtl numbers. The momentum residual can be used to check the compatibility of the Lindzen's parameterized wave drag with the diabatic/residual circulation. These comparisons can also provide an alternative way of determining the amplitude coefficients and breaking level coefficients needed to estimate the gravity wave drag. The pararmeterized wave drag can be tuned to agree very well with the structure of the momentum residual during the solstices, but not so during the equinoxes.
    publisherAmerican Meteorological Society
    titleThe Mesospheric Diabatic Circulation and the Parameterized Thermal Effect of Gravity Wave Breaking on the Circulation
    typeJournal Paper
    journal volume48
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1991)048<1093:TMDCAT>2.0.CO;2
    journal fristpage1093
    journal lastpage1111
    treeJournal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 008
    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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