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    The Impact of Polar Stratospheric Clouds on the Heating Rates of the Winter Polar Stratosphere

    Source: Journal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 003::page 245
    Author:
    Pollack, James B.
    ,
    McKay, Christopher P.
    DOI: 10.1175/1520-0469(1985)042<0245:TIOPSC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: We have computed the perturbation to the infrared radiative heating rates of the lower stratosphere due to the occurrence of polar stratospheric clouds (PSCs) during the winter season in the Antarctic and Arctic regions. The calculations were made with a multispectral radiative transfer code that allows for scattering, absorption, and thermal emission by particles and gases. We investigated perturbations due to both particulate opacity of the PSCs (direct effect), and to the partial condensation, and hence, decrease of H20 vapor accompanying their formation (indirect effect). For plausible values of model parameters, the direct effect is always one of increased radiative cooling, while the indirect effect is always one of decreased cooling. On a synoptic time scale of a single PSC event (? days), the net effect is probably one of enhanced cooling, with its magnitude having an important impact on stratospheric heating rates only for the most optically thick PSCs (extinction coefficient > 10?1 km?1). On the time scale of the winter season (? mouths), the cumulative radiative effect of multiple PSC formation may be significant for the heat budget and temperatures in the Antarctic region, but probably not so in the Arctic, where PSCs are both optically thinner and less frequent. In cases where the short- and long-term radiative effects of PSCs are significant, they act to alter the growth rate of individual PSC events and the frequency of occurrence of PSCs, respectively.
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      The Impact of Polar Stratospheric Clouds on the Heating Rates of the Winter Polar Stratosphere

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4155058
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    contributor authorPollack, James B.
    contributor authorMcKay, Christopher P.
    date accessioned2017-06-09T14:25:26Z
    date available2017-06-09T14:25:26Z
    date copyright1985/02/01
    date issued1985
    identifier issn0022-4928
    identifier otherams-18992.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4155058
    description abstractWe have computed the perturbation to the infrared radiative heating rates of the lower stratosphere due to the occurrence of polar stratospheric clouds (PSCs) during the winter season in the Antarctic and Arctic regions. The calculations were made with a multispectral radiative transfer code that allows for scattering, absorption, and thermal emission by particles and gases. We investigated perturbations due to both particulate opacity of the PSCs (direct effect), and to the partial condensation, and hence, decrease of H20 vapor accompanying their formation (indirect effect). For plausible values of model parameters, the direct effect is always one of increased radiative cooling, while the indirect effect is always one of decreased cooling. On a synoptic time scale of a single PSC event (? days), the net effect is probably one of enhanced cooling, with its magnitude having an important impact on stratospheric heating rates only for the most optically thick PSCs (extinction coefficient > 10?1 km?1). On the time scale of the winter season (? mouths), the cumulative radiative effect of multiple PSC formation may be significant for the heat budget and temperatures in the Antarctic region, but probably not so in the Arctic, where PSCs are both optically thinner and less frequent. In cases where the short- and long-term radiative effects of PSCs are significant, they act to alter the growth rate of individual PSC events and the frequency of occurrence of PSCs, respectively.
    publisherAmerican Meteorological Society
    titleThe Impact of Polar Stratospheric Clouds on the Heating Rates of the Winter Polar Stratosphere
    typeJournal Paper
    journal volume42
    journal issue3
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1985)042<0245:TIOPSC>2.0.CO;2
    journal fristpage245
    journal lastpage262
    treeJournal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 003
    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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