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    The Total Energy Norm in a Quasigeostrophic Model 

    Source: Journal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 020:;page 3443
    Author(s): Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: Total energy E as the sum of kinetic and available potential energies is considered here for quasigeostrophic (QG) dynamics. The discrete expression for E is derived for the QG model formulation of Marshall and Molteni. ...
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    The Liouville Equation and Its Potential Usefulness for the Prediction of Forecast Skill. Part II: Applications 

    Source: Monthly Weather Review:;1994:;volume( 122 ):;issue: 004:;page 714
    Author(s): Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: The Liouville equation represents the consistent and comprehensive framework for the treatment of the uncertainty inherent in meteorological forecasts. By its very nature, consideration of the Liouville equation avoids ...
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    The Liouville Equation and Its Potential Usefulness for the Prediction of Forecast Skill. Part I: Theory 

    Source: Monthly Weather Review:;1994:;volume( 122 ):;issue: 004:;page 703
    Author(s): Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: The Liouville equation provides the framework for the consistent and comprehensive treatment of the uncertainty inherent in meteorological forecasts. This equation expresses the conservation of the phase-space integral of ...
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    A Vector Derivation of the Semigeostrophic Potential Vorticity Equation 

    Source: Journal of the Atmospheric Sciences:;2004:;Volume( 061 ):;issue: 012:;page 1461
    Author(s): Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: The semigeostrophic potential vorticity equation is derived in a vector-based notation for the shallow-water and primitive equations, as models for atmospheric flow. The derivation proceeds from knowledge of the functional ...
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    Resonant Continuum Modes in the Eady Model with Rigid Lid 

    Source: Journal of the Atmospheric Sciences:;2006:;Volume( 063 ):;issue: 002:;page 765
    Author(s): Jenkner, Johannes; Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: The Eady model with rigid upper lid is considered. The resonant, linearly amplifying solution that exists in the situation of neutral normal modes when an infinitely thin potential vorticity (PV) perturbation is located ...
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    Singular-Vector-Based Covariance Propagation in a Quasigeostrophic Assimilation System 

    Source: Monthly Weather Review:;2005:;volume( 133 ):;issue: 005:;page 1295
    Author(s): Beck, Alexander; Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: Variational data assimilation systems require the specification of the covariances of background and observation errors. Although the specification of the background-error covariances has been the subject of intense research, ...
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    Mesoscale Predictability and the Spectrum of Optimal Perturbations 

    Source: Journal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 020:;page 3475
    Author(s): Ehrendorfer, Martin; Errico, Ronald M.
    Publisher: American Meteorological Society
    Abstract: The spectrum of finite-time most unstable structures, also referred to as singular vectors (SVs), is computed for a regional, mesoscale primitive-equation model. The number of growing SVs present in this spectrum is of ...
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    Optimal Prediction of Forecast Error Covariances through Singular Vectors 

    Source: Journal of the Atmospheric Sciences:;1997:;Volume( 054 ):;issue: 002:;page 286
    Author(s): Ehrendorfer, Martin; Tribbia, Joseph J.
    Publisher: American Meteorological Society
    Abstract: Optimal perturbations, also referred to as singular vectors (SVs), currently constitute an important guideline for the generation of initial ensembles to be used for ensemble prediction. The optimality of these perturbations ...
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    Adjoint Model Applications in Dynamic Meteorology 

    Source: Bulletin of the American Meteorological Society:;2007:;volume( 088 ):;issue: 012:;page 1979
    Author(s): Errico, Ronald M.; Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: No Abstract available.
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    Bayesian Approach to Decision Making Using Ensemble Weather Forecasts 

    Source: Weather and Forecasting:;2006:;volume( 021 ):;issue: 002:;page 220
    Author(s): Katz, Richard W.; Ehrendorfer, Martin
    Publisher: American Meteorological Society
    Abstract: The economic value of ensemble-based weather or climate forecasts is generally assessed by taking the ensembles at ?face value.? That is, the forecast probability is estimated as the relative frequency of occurrence of an ...
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