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    A Comparison of Lidar and Balloon-Borne Particle Counter Measurements of the Stratospheric Aerosol 1974–1980

    Source: Journal of the Atmospheric Sciences:;1982:;Volume( 039 ):;issue: 004::page 909
    Author:
    Swissler, T. J.
    ,
    Hamill, P.
    ,
    Osborn, M.
    ,
    Russell, P. B.
    ,
    McCormick, M. P.
    DOI: 10.1175/1520-0469(1982)039<0909:ACOLAB>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: We compare a series of 85 dustsonde measurements and 84 lidar measurements made in midlatitude North America during 1974?80. This period includes two major volcanic increases (Fuego in 1974 and St. Helens in 1980), as well as an unusually clean, or background, period in 1978?79. An optical modeling technique is used to relate the dustsonde-number data to the lidar-backscatter data. The model includes a range of refractive indices and of size distribution functional forms, to show its sensitivity to these factors. Moreover, two parameters of each size distribution function are adjustable, so that each distribution can be matched to any two-channel dustsonde measurement. We show how the mean particle radius for backscatter, rB, changes in response to size distribution changes revealed by the dustsonde channel ratio, Nr>0.15/Nr>0.25. (Nr>x is the number of particles with radius larger than x microns.) In early 1975, just after the Fuego injection, Nr>0.15/Nr>0.25 was ?3, and the corresponding rB, was ?0.5 ?m; by early 1980, when Nr>0.15/Nr>0.25 had increased to eight or larger, rB had correspondingly decreased to ?0.25 ?m. Throughout the 1975?76 Fuego decay, rB always exceeded 0.3 ?m; thus, lidar backscatter was influenced primarily by particles larger than those that contribute most to Nr>0.15 and Nr>0.25. This is in accord with the shorter lidar background-corrected, 1/e decay time: 7.4 months, versus 10.4 and 7.9 months for Nr>0.15 and Nr>0.25. The modeling technique is used to derive a time series of dustsonde-inferred peak backscatter mixing ratio, which agrees very well with the lidar-measured series. The best overall agreement for 1974?80 is achieved with a mixture of refractive indices corresponding to aqueous sulfuric acid at about 210 K with an acid-weight fraction between 0.6 and 0.85.
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      A Comparison of Lidar and Balloon-Borne Particle Counter Measurements of the Stratospheric Aerosol 1974–1980

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    contributor authorSwissler, T. J.
    contributor authorHamill, P.
    contributor authorOsborn, M.
    contributor authorRussell, P. B.
    contributor authorMcCormick, M. P.
    date accessioned2017-06-09T14:23:01Z
    date available2017-06-09T14:23:01Z
    date copyright1982/04/01
    date issued1982
    identifier issn0022-4928
    identifier otherams-18339.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4154333
    description abstractWe compare a series of 85 dustsonde measurements and 84 lidar measurements made in midlatitude North America during 1974?80. This period includes two major volcanic increases (Fuego in 1974 and St. Helens in 1980), as well as an unusually clean, or background, period in 1978?79. An optical modeling technique is used to relate the dustsonde-number data to the lidar-backscatter data. The model includes a range of refractive indices and of size distribution functional forms, to show its sensitivity to these factors. Moreover, two parameters of each size distribution function are adjustable, so that each distribution can be matched to any two-channel dustsonde measurement. We show how the mean particle radius for backscatter, rB, changes in response to size distribution changes revealed by the dustsonde channel ratio, Nr>0.15/Nr>0.25. (Nr>x is the number of particles with radius larger than x microns.) In early 1975, just after the Fuego injection, Nr>0.15/Nr>0.25 was ?3, and the corresponding rB, was ?0.5 ?m; by early 1980, when Nr>0.15/Nr>0.25 had increased to eight or larger, rB had correspondingly decreased to ?0.25 ?m. Throughout the 1975?76 Fuego decay, rB always exceeded 0.3 ?m; thus, lidar backscatter was influenced primarily by particles larger than those that contribute most to Nr>0.15 and Nr>0.25. This is in accord with the shorter lidar background-corrected, 1/e decay time: 7.4 months, versus 10.4 and 7.9 months for Nr>0.15 and Nr>0.25. The modeling technique is used to derive a time series of dustsonde-inferred peak backscatter mixing ratio, which agrees very well with the lidar-measured series. The best overall agreement for 1974?80 is achieved with a mixture of refractive indices corresponding to aqueous sulfuric acid at about 210 K with an acid-weight fraction between 0.6 and 0.85.
    publisherAmerican Meteorological Society
    titleA Comparison of Lidar and Balloon-Borne Particle Counter Measurements of the Stratospheric Aerosol 1974–1980
    typeJournal Paper
    journal volume39
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1982)039<0909:ACOLAB>2.0.CO;2
    journal fristpage909
    journal lastpage916
    treeJournal of the Atmospheric Sciences:;1982:;Volume( 039 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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