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    Generation of Moist Potential Vorticity in Extratropical Cyclones

    Source: Journal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 018::page 3263
    Author:
    Cao, Zuohao
    ,
    Cho, Han-Ru
    DOI: 10.1175/1520-0469(1995)052<3263:GOMPVI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The mechanism of moist potential vorticity (MPV) generation in a three-dimensional moist adiabatic and frictionless flow is investigated. It is found that MPV generation is governed by baroclinic vectors and moisture gradients. Negative (positive) MPV can be generated in regions where baroclinic vectors have a component along (against) the direction of moisture gradients. The numerical simulation of extratropical cyclones shows that negative MPV first appears in the warm sector near the north end of the cloud frontal zone at the development stage and then intensifies in the bent-back warm front at the mature stage. After the cyclone matures, the negative MPV region moves toward the warm core, and another region of negative MPV begins to develop along the cold front. The effects of the Boussinesq approximation on the distribution of vorticity and MPV are examined because this approximation, through widely used in theoretical studies, simplifies the solenoidal term in the vorticity equation. Results show that the Boussinesq approximation underestimates the thermally direct circulations in the cold front and the bent-back warm front by 25% to 30%. This effect is more pronounced when latent heat release is taken into account. It is found that the main deficiency of the Boussinesq approximation is that it will not give the correct MPV features in the intense portions of extratropical cyclones.
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      Generation of Moist Potential Vorticity in Extratropical Cyclones

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4157929
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    contributor authorCao, Zuohao
    contributor authorCho, Han-Ru
    date accessioned2017-06-09T14:33:23Z
    date available2017-06-09T14:33:23Z
    date copyright1995/09/01
    date issued1995
    identifier issn0022-4928
    identifier otherams-21575.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157929
    description abstractThe mechanism of moist potential vorticity (MPV) generation in a three-dimensional moist adiabatic and frictionless flow is investigated. It is found that MPV generation is governed by baroclinic vectors and moisture gradients. Negative (positive) MPV can be generated in regions where baroclinic vectors have a component along (against) the direction of moisture gradients. The numerical simulation of extratropical cyclones shows that negative MPV first appears in the warm sector near the north end of the cloud frontal zone at the development stage and then intensifies in the bent-back warm front at the mature stage. After the cyclone matures, the negative MPV region moves toward the warm core, and another region of negative MPV begins to develop along the cold front. The effects of the Boussinesq approximation on the distribution of vorticity and MPV are examined because this approximation, through widely used in theoretical studies, simplifies the solenoidal term in the vorticity equation. Results show that the Boussinesq approximation underestimates the thermally direct circulations in the cold front and the bent-back warm front by 25% to 30%. This effect is more pronounced when latent heat release is taken into account. It is found that the main deficiency of the Boussinesq approximation is that it will not give the correct MPV features in the intense portions of extratropical cyclones.
    publisherAmerican Meteorological Society
    titleGeneration of Moist Potential Vorticity in Extratropical Cyclones
    typeJournal Paper
    journal volume52
    journal issue18
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1995)052<3263:GOMPVI>2.0.CO;2
    journal fristpage3263
    journal lastpage3282
    treeJournal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 018
    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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