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    Probability Distributions for the Inner Scale and the Refractive Index Structure Parameter and Their Implications for Flux Averaging

    Source: Journal of Applied Meteorology:;2003:;volume( 042 ):;issue: 009::page 1316
    Author:
    Andreas, Edgar L.
    ,
    Fairall, Christopher W.
    ,
    Persson, P. Ola G.
    ,
    Guest, Peter S.
    DOI: 10.1175/1520-0450(2003)042<1316:PDFTIS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Defining the averaging time required for measuring meaningful turbulence statistics is a central problem in boundary layer meteorology. Path-averaging scintillation instruments are presumed to confer some time-averaging benefits when the objective is to measure surface fluxes, but that hypothesis has not been tested definitively. This study uses scintillometer measurements of the inner scale (l0) and the refractive index structure parameter (C2n) to investigate this question of required averaging time. The first conclusion is that the beta probability distribution is useful for representing C2n and l0 measurements. Consequently, beta distributions are used to set confidence limits on C2n and l0 values obtained over various averaging periods. When the C2n and l0 time series are stationary, a short-term average of C2n or l0 can be as accurate as a long-term average. However, as with point measurements, when time series of path averaged C2n or l0 values are nonstationary, turbulent surface fluxes inferred from these C2n and l0 values can be variable and uncertain?problems that path averaging was presumed to mitigate. Because nonstationarity is a limiting condition, the last topic is quantifying the nonstationarity with a published nonstationarity ratio and also by simply counting zero crossings in the time series.
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      Probability Distributions for the Inner Scale and the Refractive Index Structure Parameter and Their Implications for Flux Averaging

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4148720
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    contributor authorAndreas, Edgar L.
    contributor authorFairall, Christopher W.
    contributor authorPersson, P. Ola G.
    contributor authorGuest, Peter S.
    date accessioned2017-06-09T14:08:54Z
    date available2017-06-09T14:08:54Z
    date copyright2003/09/01
    date issued2003
    identifier issn0894-8763
    identifier otherams-13287.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4148720
    description abstractDefining the averaging time required for measuring meaningful turbulence statistics is a central problem in boundary layer meteorology. Path-averaging scintillation instruments are presumed to confer some time-averaging benefits when the objective is to measure surface fluxes, but that hypothesis has not been tested definitively. This study uses scintillometer measurements of the inner scale (l0) and the refractive index structure parameter (C2n) to investigate this question of required averaging time. The first conclusion is that the beta probability distribution is useful for representing C2n and l0 measurements. Consequently, beta distributions are used to set confidence limits on C2n and l0 values obtained over various averaging periods. When the C2n and l0 time series are stationary, a short-term average of C2n or l0 can be as accurate as a long-term average. However, as with point measurements, when time series of path averaged C2n or l0 values are nonstationary, turbulent surface fluxes inferred from these C2n and l0 values can be variable and uncertain?problems that path averaging was presumed to mitigate. Because nonstationarity is a limiting condition, the last topic is quantifying the nonstationarity with a published nonstationarity ratio and also by simply counting zero crossings in the time series.
    publisherAmerican Meteorological Society
    titleProbability Distributions for the Inner Scale and the Refractive Index Structure Parameter and Their Implications for Flux Averaging
    typeJournal Paper
    journal volume42
    journal issue9
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(2003)042<1316:PDFTIS>2.0.CO;2
    journal fristpage1316
    journal lastpage1329
    treeJournal of Applied Meteorology:;2003:;volume( 042 ):;issue: 009
    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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