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    The “Triple Point” on 24 May 2002 during IHOP. Part II: Ground-Radar and In Situ Boundary Layer Analysis of Cumulus Development and Convection Initiation

    Source: Monthly Weather Review:;2007:;volume( 135 ):;issue: 007::page 2443
    Author:
    Ziegler, Conrad L.
    ,
    Rasmussen, Erik N.
    ,
    Buban, Michael S.
    ,
    Richardson, Yvette P.
    ,
    Miller, L. Jay
    ,
    Rabin, Robert M.
    DOI: 10.1175/MWR3411.1
    Publisher: American Meteorological Society
    Abstract: Cumulus formation and convection initiation are examined near a cold front?dryline ?triple point? intersection on 24 May 2002 during the International H2O Project (IHOP). A new Lagrangian objective analysis technique assimilates in situ measurements using time-dependent Doppler-derived 3D wind fields, providing output 3D fields of water vapor mixing ratio, virtual potential temperature, and lifted condensation level (LCL) and water-saturated (i.e., cloud) volumes on a subdomain of the radar analysis grid. The radar and Lagrangian analyses reveal the presence of along-wind (i.e., longitudinal) and cross-wind (i.e., transverse) roll circulations in the boundary layer (BL). A remarkable finding of the evolving radar analyses is the apparent persistence of both transverse rolls and individual updraft, vertical vorticity, and reflectivity cores for periods of up to 30 min or more while moving approximately with the local BL wind. Satellite cloud images and single-camera ground photogrammetry imply that clouds tend to develop either over or on the downwind edge of BL updrafts, with a tendency for clouds to elongate and dissipate in the downwind direction relative to cloud layer winds due to weakening updrafts and mixing with drier overlying air. The Lagrangian and radar wind analyses support a parcel continuity principle for cumulus formation, which requires that rising moist air parcels achieve their LCL before moving laterally out of the updraft. Cumuli form within penetrative updrafts in the elevated residual layer (ERL) overlying the moist BL east of the triple point, but remain capped by a convection inhibition (CIN)-bearing layer above the ERL. Dropsonde data suggest the existence of a convergence line about 80 km east of the triple point where deep lifting of BL moisture and locally reduced CIN together support convection initiation.
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      The “Triple Point” on 24 May 2002 during IHOP. Part II: Ground-Radar and In Situ Boundary Layer Analysis of Cumulus Development and Convection Initiation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4229461
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    • Monthly Weather Review

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    contributor authorZiegler, Conrad L.
    contributor authorRasmussen, Erik N.
    contributor authorBuban, Michael S.
    contributor authorRichardson, Yvette P.
    contributor authorMiller, L. Jay
    contributor authorRabin, Robert M.
    date accessioned2017-06-09T17:28:35Z
    date available2017-06-09T17:28:35Z
    date copyright2007/07/01
    date issued2007
    identifier issn0027-0644
    identifier otherams-85957.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4229461
    description abstractCumulus formation and convection initiation are examined near a cold front?dryline ?triple point? intersection on 24 May 2002 during the International H2O Project (IHOP). A new Lagrangian objective analysis technique assimilates in situ measurements using time-dependent Doppler-derived 3D wind fields, providing output 3D fields of water vapor mixing ratio, virtual potential temperature, and lifted condensation level (LCL) and water-saturated (i.e., cloud) volumes on a subdomain of the radar analysis grid. The radar and Lagrangian analyses reveal the presence of along-wind (i.e., longitudinal) and cross-wind (i.e., transverse) roll circulations in the boundary layer (BL). A remarkable finding of the evolving radar analyses is the apparent persistence of both transverse rolls and individual updraft, vertical vorticity, and reflectivity cores for periods of up to 30 min or more while moving approximately with the local BL wind. Satellite cloud images and single-camera ground photogrammetry imply that clouds tend to develop either over or on the downwind edge of BL updrafts, with a tendency for clouds to elongate and dissipate in the downwind direction relative to cloud layer winds due to weakening updrafts and mixing with drier overlying air. The Lagrangian and radar wind analyses support a parcel continuity principle for cumulus formation, which requires that rising moist air parcels achieve their LCL before moving laterally out of the updraft. Cumuli form within penetrative updrafts in the elevated residual layer (ERL) overlying the moist BL east of the triple point, but remain capped by a convection inhibition (CIN)-bearing layer above the ERL. Dropsonde data suggest the existence of a convergence line about 80 km east of the triple point where deep lifting of BL moisture and locally reduced CIN together support convection initiation.
    publisherAmerican Meteorological Society
    titleThe “Triple Point” on 24 May 2002 during IHOP. Part II: Ground-Radar and In Situ Boundary Layer Analysis of Cumulus Development and Convection Initiation
    typeJournal Paper
    journal volume135
    journal issue7
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR3411.1
    journal fristpage2443
    journal lastpage2472
    treeMonthly Weather Review:;2007:;volume( 135 ):;issue: 007
    contenttypeFulltext
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