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    Transient Cold Air Drainage down a Shallow Valley

    Source: Journal of the Atmospheric Sciences:;2014:;Volume( 071 ):;issue: 007::page 2534
    Author:
    Mahrt, L.
    ,
    Sun, Jielun
    ,
    Oncley, S. P.
    ,
    Horst, T. W.
    DOI: 10.1175/JAS-D-14-0010.1
    Publisher: American Meteorological Society
    Abstract: rainage of cold air down a small valley and associated near-surface wind maxima are examined from 20 stations with sonic anemometers at 1 m and from a 20-m tower that includes six sonic anemometers in the lowest 5 m, deployed in the Shallow Cold Pool Experiment (SCP). The small valley is about 270 m wide and 12 m deep with a downvalley slope of 2%?3%. The momentum budget indicates that the flow is driven by the buoyancy deficit of the flow and opposed primarily by the stress divergence while the remaining terms are estimated to be at least an order of magnitude smaller. This analysis also reveals major difficulties in quantifying such a budget due to uncertainties in the measurements, sensitivity to choice of averaging time, and sensitivity to measurement heights.Wind maxima occur as low as 0.5 m in the downvalley drainage flow?the lowest observational level. The downvalley cold air drainage and wind maxima are frequently disrupted by transient modes that sometimes lead to significant vertical mixing. On average, the downvalley drainage of cold air occurs with particularly weak turbulence with stronger turbulence above the drainage flow. The momentum flux profile responds to the shear reversal at the wind maximum on a vertical scale of 1 m or less, suggesting the important role of finescale turbulent diffusion.
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      Transient Cold Air Drainage down a Shallow Valley

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    contributor authorMahrt, L.
    contributor authorSun, Jielun
    contributor authorOncley, S. P.
    contributor authorHorst, T. W.
    date accessioned2017-06-09T16:57:20Z
    date available2017-06-09T16:57:20Z
    date copyright2014/07/01
    date issued2014
    identifier issn0022-4928
    identifier otherams-77010.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219521
    description abstractrainage of cold air down a small valley and associated near-surface wind maxima are examined from 20 stations with sonic anemometers at 1 m and from a 20-m tower that includes six sonic anemometers in the lowest 5 m, deployed in the Shallow Cold Pool Experiment (SCP). The small valley is about 270 m wide and 12 m deep with a downvalley slope of 2%?3%. The momentum budget indicates that the flow is driven by the buoyancy deficit of the flow and opposed primarily by the stress divergence while the remaining terms are estimated to be at least an order of magnitude smaller. This analysis also reveals major difficulties in quantifying such a budget due to uncertainties in the measurements, sensitivity to choice of averaging time, and sensitivity to measurement heights.Wind maxima occur as low as 0.5 m in the downvalley drainage flow?the lowest observational level. The downvalley cold air drainage and wind maxima are frequently disrupted by transient modes that sometimes lead to significant vertical mixing. On average, the downvalley drainage of cold air occurs with particularly weak turbulence with stronger turbulence above the drainage flow. The momentum flux profile responds to the shear reversal at the wind maximum on a vertical scale of 1 m or less, suggesting the important role of finescale turbulent diffusion.
    publisherAmerican Meteorological Society
    titleTransient Cold Air Drainage down a Shallow Valley
    typeJournal Paper
    journal volume71
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-14-0010.1
    journal fristpage2534
    journal lastpage2544
    treeJournal of the Atmospheric Sciences:;2014:;Volume( 071 ):;issue: 007
    contenttypeFulltext
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