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    Vertical Velocity Fluctuations in a Nocturnal Low-Level Jet

    Source: Journal of Applied Meteorology:;1965:;volume( 004 ):;issue: 005::page 576
    Author:
    Kaimal, J. C.
    ,
    Izumi, Y.
    DOI: 10.1175/1520-0450(1965)004<0576:VVFIAN>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Sonic anemometers were installed at four levels on the Cedar Hill television tower and operated for selected periods during three weeks in August 1963. One of the runs covered the entire history of a nocturnal low-level jet. The vertical velocity fluctuations measured by the sonic anemometers are examined closely for their relationship to mean horizontal wind speed and temperature profiles obtained from existing meteorological instrumentation on the tower. In a qualitative sense the data confirm many of the current speculations on the role of turbulence in the development and dissipation of these jets. Statistical analysis of the fluctuation data provides some interesting results, particularly for the period following breakdown of the surface inversion. The constant of proportionality between standard deviation of the vertical velocity component at 150 ft and friction velocity is found to be 1.22. The limiting value of Richardson number for maintenance of an inversion at 450 ft appears to be 0.25.
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      Vertical Velocity Fluctuations in a Nocturnal Low-Level Jet

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4214589
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    contributor authorKaimal, J. C.
    contributor authorIzumi, Y.
    date accessioned2017-06-09T16:42:12Z
    date available2017-06-09T16:42:12Z
    date copyright1965/10/01
    date issued1965
    identifier issn0021-8952
    identifier otherams-7257.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4214589
    description abstractSonic anemometers were installed at four levels on the Cedar Hill television tower and operated for selected periods during three weeks in August 1963. One of the runs covered the entire history of a nocturnal low-level jet. The vertical velocity fluctuations measured by the sonic anemometers are examined closely for their relationship to mean horizontal wind speed and temperature profiles obtained from existing meteorological instrumentation on the tower. In a qualitative sense the data confirm many of the current speculations on the role of turbulence in the development and dissipation of these jets. Statistical analysis of the fluctuation data provides some interesting results, particularly for the period following breakdown of the surface inversion. The constant of proportionality between standard deviation of the vertical velocity component at 150 ft and friction velocity is found to be 1.22. The limiting value of Richardson number for maintenance of an inversion at 450 ft appears to be 0.25.
    publisherAmerican Meteorological Society
    titleVertical Velocity Fluctuations in a Nocturnal Low-Level Jet
    typeJournal Paper
    journal volume4
    journal issue5
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1965)004<0576:VVFIAN>2.0.CO;2
    journal fristpage576
    journal lastpage584
    treeJournal of Applied Meteorology:;1965:;volume( 004 ):;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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