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    Comparison of Moist Static Energy and Budget between the GCM-Simulated Madden–Julian Oscillation and Observations over the Indian Ocean and Western Pacific

    Source: Journal of Climate:;2013:;volume( 026 ):;issue: 014::page 4981
    Author:
    Wu, Xiaoqing
    ,
    Deng, Liping
    DOI: 10.1175/JCLI-D-12-00607.1
    Publisher: American Meteorological Society
    Abstract: he moist static energy (MSE) anomalies and MSE budget associated with the Madden?Julian oscillation (MJO) simulated in the Iowa State University General Circulation Model (ISUGCM) over the Indian and Pacific Oceans are compared with observations. Different phase relationships between MJO 850-hPa zonal wind, precipitation, and surface latent heat flux are simulated over the Indian Ocean and western Pacific, which are greatly influenced by the convection closure, trigger conditions, and convective momentum transport (CMT). The moist static energy builds up from the lower troposphere 15?20 days before the peak of MJO precipitation, and reaches the maximum in the middle troposphere (500?600 hPa) near the peak of MJO precipitation. The gradual lower-tropospheric heating and moistening and the upward transport of moist static energy are important aspects of MJO events, which are documented in observational studies but poorly simulated in most GCMs. The trigger conditions for deep convection, obtained from the year-long cloud-resolving model (CRM) simulations, contribute to the striking difference between ISUGCM simulations with the original and modified convection schemes and play the major role in the improved MJO simulation in ISUGCM. Additionally, the budget analysis with the ISUGCM simulations shows the increase in MJO MSE is in phase with the horizontal advection of MSE over the western Pacific, while out of phase with the horizontal advection of MSE over the Indian Ocean. However, the NCEP analysis shows that the tendency of MJO MSE is in phase with the horizontal advection of MSE over both oceans.
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      Comparison of Moist Static Energy and Budget between the GCM-Simulated Madden–Julian Oscillation and Observations over the Indian Ocean and Western Pacific

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    contributor authorWu, Xiaoqing
    contributor authorDeng, Liping
    date accessioned2017-06-09T17:07:31Z
    date available2017-06-09T17:07:31Z
    date copyright2013/07/01
    date issued2013
    identifier issn0894-8755
    identifier otherams-79757.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222572
    description abstracthe moist static energy (MSE) anomalies and MSE budget associated with the Madden?Julian oscillation (MJO) simulated in the Iowa State University General Circulation Model (ISUGCM) over the Indian and Pacific Oceans are compared with observations. Different phase relationships between MJO 850-hPa zonal wind, precipitation, and surface latent heat flux are simulated over the Indian Ocean and western Pacific, which are greatly influenced by the convection closure, trigger conditions, and convective momentum transport (CMT). The moist static energy builds up from the lower troposphere 15?20 days before the peak of MJO precipitation, and reaches the maximum in the middle troposphere (500?600 hPa) near the peak of MJO precipitation. The gradual lower-tropospheric heating and moistening and the upward transport of moist static energy are important aspects of MJO events, which are documented in observational studies but poorly simulated in most GCMs. The trigger conditions for deep convection, obtained from the year-long cloud-resolving model (CRM) simulations, contribute to the striking difference between ISUGCM simulations with the original and modified convection schemes and play the major role in the improved MJO simulation in ISUGCM. Additionally, the budget analysis with the ISUGCM simulations shows the increase in MJO MSE is in phase with the horizontal advection of MSE over the western Pacific, while out of phase with the horizontal advection of MSE over the Indian Ocean. However, the NCEP analysis shows that the tendency of MJO MSE is in phase with the horizontal advection of MSE over both oceans.
    publisherAmerican Meteorological Society
    titleComparison of Moist Static Energy and Budget between the GCM-Simulated Madden–Julian Oscillation and Observations over the Indian Ocean and Western Pacific
    typeJournal Paper
    journal volume26
    journal issue14
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00607.1
    journal fristpage4981
    journal lastpage4993
    treeJournal of Climate:;2013:;volume( 026 ):;issue: 014
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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