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    Large-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method

    Source: Journal of Climate:;1992:;volume( 005 ):;issue: 002::page 173
    Author:
    Thiao, Wassila
    ,
    Turpeinen, Olli M.
    DOI: 10.1175/1520-0442(1992)005<0173:LSDVOT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Diurnal variations of cold cloudiness during a 2-year period (October 1985?September 1987) over the tropical arm covered by Meteosat (from 23°N to 23°S and from 60°E to 60°W) are studied using a simple precipitation index based on infrared data with a unique blackbody temperature threshold of 235 K. The index is calculated every three hours and accumulated over 5-day periods. The results indicate that the cold cloudiness undergoes a pronounced diurnal cycle only over the continent during the rainy season, with an afternoon maximum between 1500 and 2100 LST and a morning minimum between 0600 and 1200 LST. Over flat areas, diurnal variations are weaker than in the mountains. Over water surfaces, the diurnal variations of cold cloudiness are irregular, but along the coasts, morning maxima (0600?1200 LST) are the most frequent. The present study shows the potential utility of the easily manageable precipitation-index dataset in cloud climatology studies, as the results reported here are in agreement with earlier studies based on more complex datasets.
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      Large-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4176878
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    contributor authorThiao, Wassila
    contributor authorTurpeinen, Olli M.
    date accessioned2017-06-09T15:15:18Z
    date available2017-06-09T15:15:18Z
    date copyright1992/02/01
    date issued1992
    identifier issn0894-8755
    identifier otherams-3863.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4176878
    description abstractDiurnal variations of cold cloudiness during a 2-year period (October 1985?September 1987) over the tropical arm covered by Meteosat (from 23°N to 23°S and from 60°E to 60°W) are studied using a simple precipitation index based on infrared data with a unique blackbody temperature threshold of 235 K. The index is calculated every three hours and accumulated over 5-day periods. The results indicate that the cold cloudiness undergoes a pronounced diurnal cycle only over the continent during the rainy season, with an afternoon maximum between 1500 and 2100 LST and a morning minimum between 0600 and 1200 LST. Over flat areas, diurnal variations are weaker than in the mountains. Over water surfaces, the diurnal variations of cold cloudiness are irregular, but along the coasts, morning maxima (0600?1200 LST) are the most frequent. The present study shows the potential utility of the easily manageable precipitation-index dataset in cloud climatology studies, as the results reported here are in agreement with earlier studies based on more complex datasets.
    publisherAmerican Meteorological Society
    titleLarge-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method
    typeJournal Paper
    journal volume5
    journal issue2
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(1992)005<0173:LSDVOT>2.0.CO;2
    journal fristpage173
    journal lastpage180
    treeJournal of Climate:;1992:;volume( 005 ):;issue: 002
    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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