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    Ensemble Transform with 3D Rescaling Initialization Method

    Source: Monthly Weather Review:;2014:;volume( 142 ):;issue: 011::page 4053
    Author:
    Ma, Juhui
    ,
    Zhu, Yuejian
    ,
    Hou, Dingchen
    ,
    Zhou, Xiaqiong
    ,
    Peña, Malaquias
    DOI: 10.1175/MWR-D-13-00367.1
    Publisher: American Meteorological Society
    Abstract: he ensemble transform with rescaling (ETR) method has been used to produce fast-growing components of analysis error in the NCEP Global Ensemble Forecast System (GEFS). The rescaling mask contained in the ETR method constrains the amplitude of perturbations to reflect regional variations of analysis error. However, because of a lack of suitable three-dimensional (3D) analysis error estimation, in the operational GEFS the mask is based on the estimated analysis error at 500 hPa and is not flow dependent but changes monthly. With the availability of an ensemble-based data assimilation system at NCEP, a 3D mask can be computed. This study generates initial perturbations by the ensemble transform with 3D rescaling (ET_3DR) and compares the performance with the ETR. Meanwhile, the ET_3DR is also applied within the ensemble Kalman filter (EnKF) method (hereafter EnKF_3DR).Results from a set of experiments indicate that the 3D mask suppresses perturbations less in unstable regions. Relative to the ETR, the large amplitudes of the ET_3DR initial perturbations at 500 hPa better reflect areas of baroclinic instability over the extratropics and deep convection over the tropics. Furthermore, the maxima of the vertical distribution for the ET_3DR initial perturbations correspond to the heights of the subtropical westerly and tropical easterly jet regions. Such perturbations produce faster spread growths. Results with EnKF_3DR also show benefits from an orthonormalization by the ensemble transform algorithm and amplitude constraint by the 3D mask rescaling. Thus, the EnKF_3DR forecasts outperform the EnKF.
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      Ensemble Transform with 3D Rescaling Initialization Method

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    contributor authorMa, Juhui
    contributor authorZhu, Yuejian
    contributor authorHou, Dingchen
    contributor authorZhou, Xiaqiong
    contributor authorPeña, Malaquias
    date accessioned2017-06-09T17:31:49Z
    date available2017-06-09T17:31:49Z
    date copyright2014/11/01
    date issued2014
    identifier issn0027-0644
    identifier otherams-86789.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4230385
    description abstracthe ensemble transform with rescaling (ETR) method has been used to produce fast-growing components of analysis error in the NCEP Global Ensemble Forecast System (GEFS). The rescaling mask contained in the ETR method constrains the amplitude of perturbations to reflect regional variations of analysis error. However, because of a lack of suitable three-dimensional (3D) analysis error estimation, in the operational GEFS the mask is based on the estimated analysis error at 500 hPa and is not flow dependent but changes monthly. With the availability of an ensemble-based data assimilation system at NCEP, a 3D mask can be computed. This study generates initial perturbations by the ensemble transform with 3D rescaling (ET_3DR) and compares the performance with the ETR. Meanwhile, the ET_3DR is also applied within the ensemble Kalman filter (EnKF) method (hereafter EnKF_3DR).Results from a set of experiments indicate that the 3D mask suppresses perturbations less in unstable regions. Relative to the ETR, the large amplitudes of the ET_3DR initial perturbations at 500 hPa better reflect areas of baroclinic instability over the extratropics and deep convection over the tropics. Furthermore, the maxima of the vertical distribution for the ET_3DR initial perturbations correspond to the heights of the subtropical westerly and tropical easterly jet regions. Such perturbations produce faster spread growths. Results with EnKF_3DR also show benefits from an orthonormalization by the ensemble transform algorithm and amplitude constraint by the 3D mask rescaling. Thus, the EnKF_3DR forecasts outperform the EnKF.
    publisherAmerican Meteorological Society
    titleEnsemble Transform with 3D Rescaling Initialization Method
    typeJournal Paper
    journal volume142
    journal issue11
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR-D-13-00367.1
    journal fristpage4053
    journal lastpage4073
    treeMonthly Weather Review:;2014:;volume( 142 ):;issue: 011
    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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