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    The Characteristics of Key Analysis Errors. Part II: The Importance of the PV Corrections and the Impact of Balance

    Source: Monthly Weather Review:;2007:;volume( 135 ):;issue: 002::page 267
    Author:
    Caron, Jean-François
    ,
    Yau, M. K.
    ,
    Laroche, Stéphane
    ,
    Zwack, Peter
    DOI: 10.1175/MWR3286.1
    Publisher: American Meteorological Society
    Abstract: This study examines a few approaches to isolate the balanced component of the initial corrections from the Canadian Meteorological Centre energy-norm-based key analysis error algorithm, in an attempt to capture the part of the key analysis errors responsible for short-range forecast errors. The best results were obtained with the nonlinear balance potential vorticity (PV) inversion technique. It was shown that the PV component of the initial corrections contains the essential information for reducing short-range forecast errors. The remaining imbalance part of the initial corrections does not grow in time and does not contribute to the improvement of the forecast. The removal of the imbalance part of the initial corrections makes the corrected analysis slightly closer to the observations, but remains systematically farther away as compared with the original analysis. Thus the balanced part of the key analysis errors cannot justifiably be associated to analysis errors. A methodology to balance the divergent part of the initial corrections, which reduces significantly the spinup in the vertical motion corrections, is also presented. Finally, in light of the results presented in this paper, some recommendations to improve the key analysis error algorithm are proposed.
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      The Characteristics of Key Analysis Errors. Part II: The Importance of the PV Corrections and the Impact of Balance

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4229324
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    • Monthly Weather Review

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    contributor authorCaron, Jean-François
    contributor authorYau, M. K.
    contributor authorLaroche, Stéphane
    contributor authorZwack, Peter
    date accessioned2017-06-09T17:28:13Z
    date available2017-06-09T17:28:13Z
    date copyright2007/02/01
    date issued2007
    identifier issn0027-0644
    identifier otherams-85833.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4229324
    description abstractThis study examines a few approaches to isolate the balanced component of the initial corrections from the Canadian Meteorological Centre energy-norm-based key analysis error algorithm, in an attempt to capture the part of the key analysis errors responsible for short-range forecast errors. The best results were obtained with the nonlinear balance potential vorticity (PV) inversion technique. It was shown that the PV component of the initial corrections contains the essential information for reducing short-range forecast errors. The remaining imbalance part of the initial corrections does not grow in time and does not contribute to the improvement of the forecast. The removal of the imbalance part of the initial corrections makes the corrected analysis slightly closer to the observations, but remains systematically farther away as compared with the original analysis. Thus the balanced part of the key analysis errors cannot justifiably be associated to analysis errors. A methodology to balance the divergent part of the initial corrections, which reduces significantly the spinup in the vertical motion corrections, is also presented. Finally, in light of the results presented in this paper, some recommendations to improve the key analysis error algorithm are proposed.
    publisherAmerican Meteorological Society
    titleThe Characteristics of Key Analysis Errors. Part II: The Importance of the PV Corrections and the Impact of Balance
    typeJournal Paper
    journal volume135
    journal issue2
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR3286.1
    journal fristpage267
    journal lastpage280
    treeMonthly Weather Review:;2007:;volume( 135 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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