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    Convective Patterns within a Field of Stratocumulus

    Source: Monthly Weather Review:;1990:;volume( 118 ):;issue: 004::page 801
    Author:
    Brümmer, Burghard
    ,
    Busack, Birgit
    DOI: 10.1175/1520-0493(1990)118<0801:CPWAFO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A case study of convective patterns observed within a field of stratocumulus is presented. Measurements were made by two aircraft over the North Sea in August 1984 during the KONTROL experiment. The slightly tilted boundary layer averaged about 900 m deep with a cloud layer of 300 m maximum thickness and cloud coverage between 3 and 6 octas. The sea surface was about 1 K warmer than the air. The boundary layer was capped by a temperature inversion of about 2 K, a sharp moisture decrease of about 3 g kg?1 and an insignificant wind shear. A spectral analysis of the cloud and moisture field shows a mesoscale cloud structure of about 8 km diameter, accompanied by a secondary flow traceable within the entire boundary layer. This flow is driven by buoyancy near the sea surface and near cloud top. Beside the mesoscale structure, three smaller structures are present which are roughly separated from each other in wavenumber by a factor of about two. These patterns are not traceable within the subcloud layer. The shortest structure of about 1 km is probably the basic convective Rayleigh mode developing in a cloud layer subject to cooling at the top. The basic state of the boundary layer is tested for cloud top entrainment instability (CEI) and mesoscale entrainment instability (MEI). It is found that the boundary layer is unstable with respect to small-scale cloud-top entrainment processes but stable to mesoscale entrainment disturbances.
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      Convective Patterns within a Field of Stratocumulus

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4202384
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    contributor authorBrümmer, Burghard
    contributor authorBusack, Birgit
    date accessioned2017-06-09T16:07:47Z
    date available2017-06-09T16:07:47Z
    date copyright1990/04/01
    date issued1990
    identifier issn0027-0644
    identifier otherams-61587.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4202384
    description abstractA case study of convective patterns observed within a field of stratocumulus is presented. Measurements were made by two aircraft over the North Sea in August 1984 during the KONTROL experiment. The slightly tilted boundary layer averaged about 900 m deep with a cloud layer of 300 m maximum thickness and cloud coverage between 3 and 6 octas. The sea surface was about 1 K warmer than the air. The boundary layer was capped by a temperature inversion of about 2 K, a sharp moisture decrease of about 3 g kg?1 and an insignificant wind shear. A spectral analysis of the cloud and moisture field shows a mesoscale cloud structure of about 8 km diameter, accompanied by a secondary flow traceable within the entire boundary layer. This flow is driven by buoyancy near the sea surface and near cloud top. Beside the mesoscale structure, three smaller structures are present which are roughly separated from each other in wavenumber by a factor of about two. These patterns are not traceable within the subcloud layer. The shortest structure of about 1 km is probably the basic convective Rayleigh mode developing in a cloud layer subject to cooling at the top. The basic state of the boundary layer is tested for cloud top entrainment instability (CEI) and mesoscale entrainment instability (MEI). It is found that the boundary layer is unstable with respect to small-scale cloud-top entrainment processes but stable to mesoscale entrainment disturbances.
    publisherAmerican Meteorological Society
    titleConvective Patterns within a Field of Stratocumulus
    typeJournal Paper
    journal volume118
    journal issue4
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1990)118<0801:CPWAFO>2.0.CO;2
    journal fristpage801
    journal lastpage817
    treeMonthly Weather Review:;1990:;volume( 118 ):;issue: 004
    contenttypeFulltext
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