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    Effect of Dewfall and Frostfall on Nighttime Cooling in a Small, Closed Basin

    Source: Journal of Applied Meteorology and Climatology:;2007:;volume( 046 ):;issue: 001::page 3
    Author:
    Whiteman, C. David
    ,
    De Wekker, Stephan F. J.
    ,
    Haiden, Thomas
    DOI: 10.1175/JAM2453.1
    Publisher: American Meteorological Society
    Abstract: Series of tethered balloon soundings of temperature and humidity in Austria?s Gruenloch basin (floor elevation 1270 m MSL) on two June days showed that the water vapor mixing ratio fell by 2?3 g kg?1 overnight as dew or frost formed in the basin. After sunrise, the basin atmosphere remoistened as higher humidity was brought down into the basin from above and as evapotranspiration occurred from the basin floor and sidewalls. The latent heat released at night by the dewfall/frostfall was 33%?53% of the overall observed basin sensible heat loss, illustrating the important role of dew and frost formation on the nighttime heat budget of the basin atmosphere. An energy budget equation illustrates the decreasing importance of the latent heat release on the overall basin heat budget as ambient temperatures fall from summer to winter. Because the diurnal temperature range is frequently larger than the late-afternoon dewpoint depression, fog and clouds often form in this basin. The extreme temperature minima that have been previously observed in this basin are expected to be attained only if such cloud moisture is removed. Calculations show that several cloud moisture removal processes may be effective in removing this moisture.
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      Effect of Dewfall and Frostfall on Nighttime Cooling in a Small, Closed Basin

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4216601
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    contributor authorWhiteman, C. David
    contributor authorDe Wekker, Stephan F. J.
    contributor authorHaiden, Thomas
    date accessioned2017-06-09T16:48:06Z
    date available2017-06-09T16:48:06Z
    date copyright2007/01/01
    date issued2007
    identifier issn1558-8424
    identifier otherams-74382.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4216601
    description abstractSeries of tethered balloon soundings of temperature and humidity in Austria?s Gruenloch basin (floor elevation 1270 m MSL) on two June days showed that the water vapor mixing ratio fell by 2?3 g kg?1 overnight as dew or frost formed in the basin. After sunrise, the basin atmosphere remoistened as higher humidity was brought down into the basin from above and as evapotranspiration occurred from the basin floor and sidewalls. The latent heat released at night by the dewfall/frostfall was 33%?53% of the overall observed basin sensible heat loss, illustrating the important role of dew and frost formation on the nighttime heat budget of the basin atmosphere. An energy budget equation illustrates the decreasing importance of the latent heat release on the overall basin heat budget as ambient temperatures fall from summer to winter. Because the diurnal temperature range is frequently larger than the late-afternoon dewpoint depression, fog and clouds often form in this basin. The extreme temperature minima that have been previously observed in this basin are expected to be attained only if such cloud moisture is removed. Calculations show that several cloud moisture removal processes may be effective in removing this moisture.
    publisherAmerican Meteorological Society
    titleEffect of Dewfall and Frostfall on Nighttime Cooling in a Small, Closed Basin
    typeJournal Paper
    journal volume46
    journal issue1
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAM2453.1
    journal fristpage3
    journal lastpage13
    treeJournal of Applied Meteorology and Climatology:;2007:;volume( 046 ):;issue: 001
    contenttypeFulltext
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