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    Solar Activity and Cloud Opacity Variations: A Modulated Cosmic Ray Ionization Model

    Source: Journal of the Atmospheric Sciences:;2003:;Volume( 060 ):;issue: 004::page 626
    Author:
    Marsden, David
    ,
    Lingenfelter, Richard E.
    DOI: 10.1175/1520-0469(2003)060<0626:SAACOV>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The observed correlation between global low cloud amount and the flux of high energy cosmic rays supports the idea that ionization plays a crucial role in tropospheric cloud formation. This idea is explored quantitatively with a simple model linking the concentration of cloud condensation nuclei to the varying ionization rate due to cosmic rays. Among the predictions of the model is a variation in global cloud optical thickness, or opacity, with cosmic ray rate. Using the International Satellite Cloud Climatology Project (ISCCP) database (1983?99), a search was conducted for variations in the yearly mean visible cloud opacity and visible cloud amount due to cosmic rays. After separating out temporal variations in the data due to the Mount Pinatubo eruption and El Niño?Southern Oscillation, systematic variations in opacity and cloud amount due to cosmic rays were identified. It was found that the fractional amplitude of the opacity variations due to cosmic rays increases with cloud altitude, becoming approximately zero or negative (inverse correlation) for low clouds. Conversely, the fractional changes in visible cloud amount due to cosmic rays are only positively correlated for low clouds and become negative or zero for the higher clouds. The opacity trends suggest behavior contrary to the current predictions of ion-mediated nucleation (IMN) models, but more accurate temporal modeling of the ISCCP data is needed before definitive conclusions can be drawn.
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      Solar Activity and Cloud Opacity Variations: A Modulated Cosmic Ray Ionization Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159816
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    contributor authorMarsden, David
    contributor authorLingenfelter, Richard E.
    date accessioned2017-06-09T14:38:10Z
    date available2017-06-09T14:38:10Z
    date copyright2003/02/01
    date issued2003
    identifier issn0022-4928
    identifier otherams-23273.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159816
    description abstractThe observed correlation between global low cloud amount and the flux of high energy cosmic rays supports the idea that ionization plays a crucial role in tropospheric cloud formation. This idea is explored quantitatively with a simple model linking the concentration of cloud condensation nuclei to the varying ionization rate due to cosmic rays. Among the predictions of the model is a variation in global cloud optical thickness, or opacity, with cosmic ray rate. Using the International Satellite Cloud Climatology Project (ISCCP) database (1983?99), a search was conducted for variations in the yearly mean visible cloud opacity and visible cloud amount due to cosmic rays. After separating out temporal variations in the data due to the Mount Pinatubo eruption and El Niño?Southern Oscillation, systematic variations in opacity and cloud amount due to cosmic rays were identified. It was found that the fractional amplitude of the opacity variations due to cosmic rays increases with cloud altitude, becoming approximately zero or negative (inverse correlation) for low clouds. Conversely, the fractional changes in visible cloud amount due to cosmic rays are only positively correlated for low clouds and become negative or zero for the higher clouds. The opacity trends suggest behavior contrary to the current predictions of ion-mediated nucleation (IMN) models, but more accurate temporal modeling of the ISCCP data is needed before definitive conclusions can be drawn.
    publisherAmerican Meteorological Society
    titleSolar Activity and Cloud Opacity Variations: A Modulated Cosmic Ray Ionization Model
    typeJournal Paper
    journal volume60
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2003)060<0626:SAACOV>2.0.CO;2
    journal fristpage626
    journal lastpage636
    treeJournal of the Atmospheric Sciences:;2003:;Volume( 060 ):;issue: 004
    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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