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    The Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events

    Source: Journal of Climate:;2008:;volume( 021 ):;issue: 022::page 5904
    Author:
    Neale, Richard B.
    ,
    Richter, Jadwiga H.
    ,
    Jochum, Markus
    DOI: 10.1175/2008JCLI2244.1
    Publisher: American Meteorological Society
    Abstract: The NCAR Community Climate System Model, version 3 (CCSM3) exhibits persistent errors in its simulation of the El Niño?Southern Oscillation (ENSO) mode of coupled variability. The amplitude of the oscillation is too strong, the dominant 2-yr period too regular, and the width of the sea surface temperature response in the Pacific too narrow, with positive anomalies extending too far into the western Pacific. Two changes in the parameterization of deep convection result in a significant improvement to many aspects of the ENSO simulation. The inclusion of convective momentum transport (CMT) and a dilution approximation for the calculation of convective available potential energy (CAPE) are used in development integrations, and a striking improvement in ENSO characteristics is seen. An increase in the periodicity of ENSO is achieved by a reduction in the strength of the existing ?short-circuited? delayed-oscillator mode. The off-equatorial response is weaker and less tropically confined, largely as a result of the CMT and an associated redistribution of zonal momentum. The Pacific east?west structure is improved in response to the presence of convective dilution and cooling provided by increased surface fluxes. The initiation of El Niño events is fundamentally different. Enhanced intraseasonal surface stress variability leads to absolute surface westerlies and a cooling?warming dipole between the Philippine Sea and western Pacific. Lag-regression analysis shows that intraseasonal variability may play a significant role in event initiation and maintenance as opposed to being a benign response to increased SSTs. Recent observational evidence appears to support such a leading relationship.
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      The Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events

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    contributor authorNeale, Richard B.
    contributor authorRichter, Jadwiga H.
    contributor authorJochum, Markus
    date accessioned2017-06-09T16:23:42Z
    date available2017-06-09T16:23:42Z
    date copyright2008/11/01
    date issued2008
    identifier issn0894-8755
    identifier otherams-67088.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208496
    description abstractThe NCAR Community Climate System Model, version 3 (CCSM3) exhibits persistent errors in its simulation of the El Niño?Southern Oscillation (ENSO) mode of coupled variability. The amplitude of the oscillation is too strong, the dominant 2-yr period too regular, and the width of the sea surface temperature response in the Pacific too narrow, with positive anomalies extending too far into the western Pacific. Two changes in the parameterization of deep convection result in a significant improvement to many aspects of the ENSO simulation. The inclusion of convective momentum transport (CMT) and a dilution approximation for the calculation of convective available potential energy (CAPE) are used in development integrations, and a striking improvement in ENSO characteristics is seen. An increase in the periodicity of ENSO is achieved by a reduction in the strength of the existing ?short-circuited? delayed-oscillator mode. The off-equatorial response is weaker and less tropically confined, largely as a result of the CMT and an associated redistribution of zonal momentum. The Pacific east?west structure is improved in response to the presence of convective dilution and cooling provided by increased surface fluxes. The initiation of El Niño events is fundamentally different. Enhanced intraseasonal surface stress variability leads to absolute surface westerlies and a cooling?warming dipole between the Philippine Sea and western Pacific. Lag-regression analysis shows that intraseasonal variability may play a significant role in event initiation and maintenance as opposed to being a benign response to increased SSTs. Recent observational evidence appears to support such a leading relationship.
    publisherAmerican Meteorological Society
    titleThe Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events
    typeJournal Paper
    journal volume21
    journal issue22
    journal titleJournal of Climate
    identifier doi10.1175/2008JCLI2244.1
    journal fristpage5904
    journal lastpage5924
    treeJournal of Climate:;2008:;volume( 021 ):;issue: 022
    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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