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    The Effect of Line Averaging on Scalar Flux Measurements with a Sonic Anemometer near the Surface

    Source: Journal of Atmospheric and Oceanic Technology:;1984:;volume( 001 ):;issue: 002::page 138
    Author:
    Kristensen, Leif
    ,
    Fitzjarrald, David R.
    DOI: 10.1175/1520-0426(1984)001<0138:TEOLAO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: We present a theoretical analysis of the effect of line averaging by a sonic anemometer on scalar fluxes and an observational study of this phenomenon in the atmospheric surface layer. The theoretical analysis rests on an axisymmetric model for the cross-spectral tensor of vertical velocity and scalar fluctuations, limiting the validity of the derived transfer function to a constant-flux layer. Observations of temperature flux in the unstable surface layer confirm the theoretical prediction that line averaging does not significantly affect the flux estimate down to heights only several times the sonic path length. However, the observations exhibit large scatter at small height, indicating that problems with the representativity of the measurement and not with line averaging may become a limiting factor. Based on the analysis of the Kansas data and the characteristics of the transfer function, we infer that temperature flux measurements will, in general, be affected by some line averaging under stable conditions at all heights in the surface layer. In these cases, the theoretical transfer function may be used to correct the measured heat fluxes.
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      The Effect of Line Averaging on Scalar Flux Measurements with a Sonic Anemometer near the Surface

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4215066
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    • Journal of Atmospheric and Oceanic Technology

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    contributor authorKristensen, Leif
    contributor authorFitzjarrald, David R.
    date accessioned2017-06-09T16:43:23Z
    date available2017-06-09T16:43:23Z
    date copyright1984/06/01
    date issued1984
    identifier issn0739-0572
    identifier otherams-73.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4215066
    description abstractWe present a theoretical analysis of the effect of line averaging by a sonic anemometer on scalar fluxes and an observational study of this phenomenon in the atmospheric surface layer. The theoretical analysis rests on an axisymmetric model for the cross-spectral tensor of vertical velocity and scalar fluctuations, limiting the validity of the derived transfer function to a constant-flux layer. Observations of temperature flux in the unstable surface layer confirm the theoretical prediction that line averaging does not significantly affect the flux estimate down to heights only several times the sonic path length. However, the observations exhibit large scatter at small height, indicating that problems with the representativity of the measurement and not with line averaging may become a limiting factor. Based on the analysis of the Kansas data and the characteristics of the transfer function, we infer that temperature flux measurements will, in general, be affected by some line averaging under stable conditions at all heights in the surface layer. In these cases, the theoretical transfer function may be used to correct the measured heat fluxes.
    publisherAmerican Meteorological Society
    titleThe Effect of Line Averaging on Scalar Flux Measurements with a Sonic Anemometer near the Surface
    typeJournal Paper
    journal volume1
    journal issue2
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(1984)001<0138:TEOLAO>2.0.CO;2
    journal fristpage138
    journal lastpage146
    treeJournal of Atmospheric and Oceanic Technology:;1984:;volume( 001 ):;issue: 002
    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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