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    Convectively Coupled Equatorial Waves Simulated on an Aquaplanet in a Global Nonhydrostatic Experiment

    Source: Journal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 004::page 1246
    Author:
    Nasuno, Tomoe
    ,
    Tomita, Hirofumi
    ,
    Iga, Shinichi
    ,
    Miura, Hiroaki
    ,
    Satoh, Masaki
    DOI: 10.1175/2007JAS2395.1
    Publisher: American Meteorological Society
    Abstract: Large-scale tropical convective disturbances simulated in a 7-km-mesh aquaplanet experiment are investigated. A 40-day simulation was executed using the Nonhydrostatic Icosahedral Atmospheric Model (NICAM). Two scales of eastward-propagating disturbances were analyzed. One was tightly coupled to a convective system resembling super?cloud clusters (SCCs) with a zonal scale of several thousand kilometers (SCC mode), whereas the other was characterized by a planetary-scale dynamical structure (40 000-km mode). The typical phase velocity was 17 (23) m s?1 for the SCC (40 000 km) mode. The SCC mode resembled convectively coupled Kelvin waves in the real atmosphere around the equator, but was accompanied by a pair of off-equatorial gyres. The 40 000-km mode maintained a Kelvin wave?like zonal structure, even poleward of the equatorial Rossby deformation radius. The equatorial structures in both modes matched neutral eastward-propagating gravity waves in the lower troposphere and unstable (growing) waves in the upper troposphere. In both modes, the meridional mass divergence exceeded the zonal component, not only in the boundary layer, but also in the free atmosphere. The forcing terms indicated that the meridional flow was primarily driven by convection via deformation in pressure fields and vertical circulations. Moisture convergence was one order of magnitude greater than the moisture flux from the sea surface. In the boundary layer, frictional convergence in the (anomalous) low-level easterly phase accounted for the buildup of low-level moisture leading to the active convective phase. The moisture distribution in the free atmosphere suggested that the moisture?convection feedback operated efficiently, especially in the SCC mode.
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      Convectively Coupled Equatorial Waves Simulated on an Aquaplanet in a Global Nonhydrostatic Experiment

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206769
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    contributor authorNasuno, Tomoe
    contributor authorTomita, Hirofumi
    contributor authorIga, Shinichi
    contributor authorMiura, Hiroaki
    contributor authorSatoh, Masaki
    date accessioned2017-06-09T16:18:45Z
    date available2017-06-09T16:18:45Z
    date copyright2008/04/01
    date issued2008
    identifier issn0022-4928
    identifier otherams-65533.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206769
    description abstractLarge-scale tropical convective disturbances simulated in a 7-km-mesh aquaplanet experiment are investigated. A 40-day simulation was executed using the Nonhydrostatic Icosahedral Atmospheric Model (NICAM). Two scales of eastward-propagating disturbances were analyzed. One was tightly coupled to a convective system resembling super?cloud clusters (SCCs) with a zonal scale of several thousand kilometers (SCC mode), whereas the other was characterized by a planetary-scale dynamical structure (40 000-km mode). The typical phase velocity was 17 (23) m s?1 for the SCC (40 000 km) mode. The SCC mode resembled convectively coupled Kelvin waves in the real atmosphere around the equator, but was accompanied by a pair of off-equatorial gyres. The 40 000-km mode maintained a Kelvin wave?like zonal structure, even poleward of the equatorial Rossby deformation radius. The equatorial structures in both modes matched neutral eastward-propagating gravity waves in the lower troposphere and unstable (growing) waves in the upper troposphere. In both modes, the meridional mass divergence exceeded the zonal component, not only in the boundary layer, but also in the free atmosphere. The forcing terms indicated that the meridional flow was primarily driven by convection via deformation in pressure fields and vertical circulations. Moisture convergence was one order of magnitude greater than the moisture flux from the sea surface. In the boundary layer, frictional convergence in the (anomalous) low-level easterly phase accounted for the buildup of low-level moisture leading to the active convective phase. The moisture distribution in the free atmosphere suggested that the moisture?convection feedback operated efficiently, especially in the SCC mode.
    publisherAmerican Meteorological Society
    titleConvectively Coupled Equatorial Waves Simulated on an Aquaplanet in a Global Nonhydrostatic Experiment
    typeJournal Paper
    journal volume65
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2007JAS2395.1
    journal fristpage1246
    journal lastpage1265
    treeJournal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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