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    Mass and Energy Budgets of a 1 km High Atmospheric Box over the GATE C-Scale Triangle during Undisturbed and Disturbed Weather Conditions

    Source: Journal of the Atmospheric Sciences:;1978:;Volume( 035 ):;issue: 006::page 997
    Author:
    Brümmer, Burghard
    DOI: 10.1175/1520-0469(1978)035<0997:MAEBOA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Using vertical wind, temperature and humidity profiles in the C-scale triangle during GATE from 2?5 September 1974, the budgets of mass, latent heat and dry and moist static energy are calculated in the lowest kilometer of the atmosphere. The computations are performed for intervals of 3?6 h. Using radar pictures the results are classified as ?undisturbed? or ?disturbed? with respect to the convective activity. The horizontal flow near the sea surface is nearly always convergent. During disturbed situations the low-level convergence (?10?4 s?1) is about one order of magnitude larger than during undisturbed conditions. When relating the convection (radar echo covergage) to the low-level convergence it is found that a certain background value of convergence must be exceeded before radar echoes (raining convection) develop and that the convection reacts with a delay of 3?4 h to variations of the low-level divergence. During disturbed situations the subgrid-scale flux of moist static energy at the sea surface is about 30% greater than during undisturbed conditions. The flux is constant with height in undisturbed conditions but increases with height in disturbed situations. At cloud base the subgrid-scale flux of moist static energy is about twice as large in disturbed conditions (180 W m?2) as in undisturbed conditions (100 W m?2).
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      Mass and Energy Budgets of a 1 km High Atmospheric Box over the GATE C-Scale Triangle during Undisturbed and Disturbed Weather Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4153391
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    contributor authorBrümmer, Burghard
    date accessioned2017-06-09T14:20:08Z
    date available2017-06-09T14:20:08Z
    date copyright1978/06/01
    date issued1978
    identifier issn0022-4928
    identifier otherams-17491.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4153391
    description abstractUsing vertical wind, temperature and humidity profiles in the C-scale triangle during GATE from 2?5 September 1974, the budgets of mass, latent heat and dry and moist static energy are calculated in the lowest kilometer of the atmosphere. The computations are performed for intervals of 3?6 h. Using radar pictures the results are classified as ?undisturbed? or ?disturbed? with respect to the convective activity. The horizontal flow near the sea surface is nearly always convergent. During disturbed situations the low-level convergence (?10?4 s?1) is about one order of magnitude larger than during undisturbed conditions. When relating the convection (radar echo covergage) to the low-level convergence it is found that a certain background value of convergence must be exceeded before radar echoes (raining convection) develop and that the convection reacts with a delay of 3?4 h to variations of the low-level divergence. During disturbed situations the subgrid-scale flux of moist static energy at the sea surface is about 30% greater than during undisturbed conditions. The flux is constant with height in undisturbed conditions but increases with height in disturbed situations. At cloud base the subgrid-scale flux of moist static energy is about twice as large in disturbed conditions (180 W m?2) as in undisturbed conditions (100 W m?2).
    publisherAmerican Meteorological Society
    titleMass and Energy Budgets of a 1 km High Atmospheric Box over the GATE C-Scale Triangle during Undisturbed and Disturbed Weather Conditions
    typeJournal Paper
    journal volume35
    journal issue6
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1978)035<0997:MAEBOA>2.0.CO;2
    journal fristpage997
    journal lastpage1011
    treeJournal of the Atmospheric Sciences:;1978:;Volume( 035 ):;issue: 006
    contenttypeFulltext
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