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    Comparison of Eddy Dissipation Rates from Spatial Spectra of Doppler Velocities and Doppler Spectrum Widths

    Source: Journal of Atmospheric and Oceanic Technology:;1986:;volume( 003 ):;issue: 003::page 440
    Author:
    Brewster, Keith A.
    ,
    Zrnić, Dusan S.
    DOI: 10.1175/1520-0426(1986)003<0440:COEDRF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Doppler radars offer unique data from which it is possible to estimate the turbulent eddy dissipation rates, ?. If the inertial subrange extends to lengths longer than the radar resolution volume size, ? can be obtained from the Doppler spectrum width. Spatial spectra of mean Doppler velocities can also yield ? estimates but only if a significant portion of the analysis length is contained within the inertial subrange. We compare dissipation rate estimates obtained with the two independent measurement techniques. At close range and vertical incidence, agreement between the two independent estimates of ? is within 10%. Furthermore, the slope of the spatial energy densities is very close to ?5/3 predicted by Kolmogorov. The energy input is mainly from buoyancy-driven updrafts and the transition wavelength (about 3 km) between the input scale and the inertial subrange is consistent with the updraft-downdraft circulation cell, which is about 10 km. For a more distant storm at a range of 60 km, the filtering of mean velocities by the resolution volume precludes precise estimation of ? from spatial spectra of mean velocities.
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      Comparison of Eddy Dissipation Rates from Spatial Spectra of Doppler Velocities and Doppler Spectrum Widths

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4158067
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    contributor authorBrewster, Keith A.
    contributor authorZrnić, Dusan S.
    date accessioned2017-06-09T14:33:42Z
    date available2017-06-09T14:33:42Z
    date copyright1986/09/01
    date issued1986
    identifier issn0739-0572
    identifier otherams-217.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4158067
    description abstractDoppler radars offer unique data from which it is possible to estimate the turbulent eddy dissipation rates, ?. If the inertial subrange extends to lengths longer than the radar resolution volume size, ? can be obtained from the Doppler spectrum width. Spatial spectra of mean Doppler velocities can also yield ? estimates but only if a significant portion of the analysis length is contained within the inertial subrange. We compare dissipation rate estimates obtained with the two independent measurement techniques. At close range and vertical incidence, agreement between the two independent estimates of ? is within 10%. Furthermore, the slope of the spatial energy densities is very close to ?5/3 predicted by Kolmogorov. The energy input is mainly from buoyancy-driven updrafts and the transition wavelength (about 3 km) between the input scale and the inertial subrange is consistent with the updraft-downdraft circulation cell, which is about 10 km. For a more distant storm at a range of 60 km, the filtering of mean velocities by the resolution volume precludes precise estimation of ? from spatial spectra of mean velocities.
    publisherAmerican Meteorological Society
    titleComparison of Eddy Dissipation Rates from Spatial Spectra of Doppler Velocities and Doppler Spectrum Widths
    typeJournal Paper
    journal volume3
    journal issue3
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(1986)003<0440:COEDRF>2.0.CO;2
    journal fristpage440
    journal lastpage452
    treeJournal of Atmospheric and Oceanic Technology:;1986:;volume( 003 ):;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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