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    The Shape of Averaged Drop Size Distributions

    Source: Journal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 008::page 1070
    Author:
    Sauvageot, Henri
    ,
    Lacaux, Jean-Pierre
    DOI: 10.1175/1520-0469(1995)052<1070:TSOADS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The shape of averaged drop size distributions (DSD) is studied from a large sample of data (892 h) collected at several sites of various latitudes. The results show that neither the hypothesis of an exponential distribution to represent rainfall with a high rain raw (R) nor the concept of equilibrium distribution arising from the various models using the parameterization of Low and List is compatible with the observations. To describe the DSD two regions have to be distinguished: a small-drop region, for diameter D smaller than a threshold Dc, and a large-drop region, for diameter D larger than Dc. For DDc, the slope of the distributions is almost independent of D. At low values of R (<20 mm h?1) it decreases when R increases, and not much depends on z0. For increasing values of R beyond about 20 mm h?1, the slope of the distributions tends toward a constant value of about 2.2?2.3 mm?1. This suggests a certain stationarity between the coalescence and collisional breakup processes in intense rainfalls. It also appears that the two regions are not much influenced by each other. The value of Dc increases with R and with z0. The relation between the radar reflectivity factor (Z) and R obtained from the averaged DSDs are close to those calculated from nonaveraged data and compatible with those proposed in the literature. The differences observed between the coefficients of Z?R relations for various types of rain are essentially due to the differences in small-drop concentration.
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      The Shape of Averaged Drop Size Distributions

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    contributor authorSauvageot, Henri
    contributor authorLacaux, Jean-Pierre
    date accessioned2017-06-09T14:32:56Z
    date available2017-06-09T14:32:56Z
    date copyright1995/04/01
    date issued1995
    identifier issn0022-4928
    identifier otherams-21422.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157760
    description abstractThe shape of averaged drop size distributions (DSD) is studied from a large sample of data (892 h) collected at several sites of various latitudes. The results show that neither the hypothesis of an exponential distribution to represent rainfall with a high rain raw (R) nor the concept of equilibrium distribution arising from the various models using the parameterization of Low and List is compatible with the observations. To describe the DSD two regions have to be distinguished: a small-drop region, for diameter D smaller than a threshold Dc, and a large-drop region, for diameter D larger than Dc. For DDc, the slope of the distributions is almost independent of D. At low values of R (<20 mm h?1) it decreases when R increases, and not much depends on z0. For increasing values of R beyond about 20 mm h?1, the slope of the distributions tends toward a constant value of about 2.2?2.3 mm?1. This suggests a certain stationarity between the coalescence and collisional breakup processes in intense rainfalls. It also appears that the two regions are not much influenced by each other. The value of Dc increases with R and with z0. The relation between the radar reflectivity factor (Z) and R obtained from the averaged DSDs are close to those calculated from nonaveraged data and compatible with those proposed in the literature. The differences observed between the coefficients of Z?R relations for various types of rain are essentially due to the differences in small-drop concentration.
    publisherAmerican Meteorological Society
    titleThe Shape of Averaged Drop Size Distributions
    typeJournal Paper
    journal volume52
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1995)052<1070:TSOADS>2.0.CO;2
    journal fristpage1070
    journal lastpage1083
    treeJournal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 008
    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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