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    The Influence of Seasonally Varying Atmospheric Characteristics on the Intensity of Nocturnal Cooling in a High Mountain Hollow

    Source: Journal of Applied Meteorology:;2002:;volume( 041 ):;issue: 007::page 734
    Author:
    Iijima, Yoshihiro
    ,
    Shinoda, Masato
    DOI: 10.1175/1520-0450(2002)041<0734:TIOSVA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Seasonal differences in the longwave radiation balance, diurnal cycles of humidity and cloudiness, and ambient winds during the warm season were evaluated to determine their effect on the nocturnal cooling processes of a high mountain hollow in central Japan. This hollow is located at an elevation of 2230 m at the bottom, having a depth of 50?200 m with a diameter of approximately 1 km. One of the most marked seasonal changes in the atmosphere is a reduction in the downward longwave radiation from summer to autumn due to reduced water vapor. This reduction is larger than that of the upward longwave radiation due to a reduced surface temperature. This radiation balance resulted in larger (smaller) potential intensity of radiative cooling during autumn (summer). A composite analysis of diurnal variation for days in summer and autumn showed that the humidity and cloud conditions, differing between the seasons, determined the initial timing and development of nocturnal cooling. During summer (July and August), increased downward longwave radiation in the evening caused by a combination of increased water vapor and cloud cover over the mountains, suppresses and delays cooling. In contrast, dry and fair weather conditions throughout early autumn (September and October) causes strong and continuous cooling. Despite the high potential for radiative cooling during late autumn (after mid-October), nocturnal cooling was frequently disturbed by strong ambient winds exceeding 3.6 m s?1. The weak winds during summer and early autumn have a minor effect in determining the actual cooling intensity.
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      The Influence of Seasonally Varying Atmospheric Characteristics on the Intensity of Nocturnal Cooling in a High Mountain Hollow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4148580
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    contributor authorIijima, Yoshihiro
    contributor authorShinoda, Masato
    date accessioned2017-06-09T14:08:28Z
    date available2017-06-09T14:08:28Z
    date copyright2002/07/01
    date issued2002
    identifier issn0894-8763
    identifier otherams-13160.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4148580
    description abstractSeasonal differences in the longwave radiation balance, diurnal cycles of humidity and cloudiness, and ambient winds during the warm season were evaluated to determine their effect on the nocturnal cooling processes of a high mountain hollow in central Japan. This hollow is located at an elevation of 2230 m at the bottom, having a depth of 50?200 m with a diameter of approximately 1 km. One of the most marked seasonal changes in the atmosphere is a reduction in the downward longwave radiation from summer to autumn due to reduced water vapor. This reduction is larger than that of the upward longwave radiation due to a reduced surface temperature. This radiation balance resulted in larger (smaller) potential intensity of radiative cooling during autumn (summer). A composite analysis of diurnal variation for days in summer and autumn showed that the humidity and cloud conditions, differing between the seasons, determined the initial timing and development of nocturnal cooling. During summer (July and August), increased downward longwave radiation in the evening caused by a combination of increased water vapor and cloud cover over the mountains, suppresses and delays cooling. In contrast, dry and fair weather conditions throughout early autumn (September and October) causes strong and continuous cooling. Despite the high potential for radiative cooling during late autumn (after mid-October), nocturnal cooling was frequently disturbed by strong ambient winds exceeding 3.6 m s?1. The weak winds during summer and early autumn have a minor effect in determining the actual cooling intensity.
    publisherAmerican Meteorological Society
    titleThe Influence of Seasonally Varying Atmospheric Characteristics on the Intensity of Nocturnal Cooling in a High Mountain Hollow
    typeJournal Paper
    journal volume41
    journal issue7
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(2002)041<0734:TIOSVA>2.0.CO;2
    journal fristpage734
    journal lastpage743
    treeJournal of Applied Meteorology:;2002:;volume( 041 ):;issue: 007
    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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