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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-340
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-340
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: methods for assessment of models 05 Mar 2020

Submitted as: methods for assessment of models | 05 Mar 2020

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This preprint is currently under review for the journal GMD.

Three-dimensional normal mode functions: Open access tools for their computation in isobaric coordinates (p-3DNMF.v1)

Carlos A. F. Marques1, Martinho Marta-Almeida2,3, and José M. Castanheira1 Carlos A. F. Marques et al.
  • 1CESAM & Departamento de Física, Universidade de Aveiro. Aveiro, Portugal
  • 2Universidade de Vigo, Campus Lagoas-Marcosende, Vigo, Spain
  • 3Centro Oceanográfico de A Coruña, Instituto Español de Oceanografía, A Coruña, Spain

Abstract. A free software package for the computation of the 3-Dimensional Normal Modes of an hydrostatic atmosphere is presented. This software performs the computations in isobaric coordinates and was developed for two user friendly languages: MATLAB and Python. The software can be used to expand the global atmospheric circulation onto the 3-D Normal Modes. This expansion allows the computation of a 3-D energetic scheme which partition the energy reservoirs and energy interactions between 3-D spatial scales, and between barotropic and baroclinic components as well as between balanced (rotational) and unbalanced (divergent) circulation fields. Moreover, by retaining only a subset of the expansion coefficients, the 3-D normal mode expansion can be used for spatial scale filtering of atmospheric motion, and filtering of balanced motion and mass unbalanced motions, and barotropic and baroclinic components. Fixing the meridional scale, the 3-D normal mode filtering can be used to isolate tropical components of the atmospheric circulation. All these features are useful both in data analysis and in assessment of general circulation atmospheric models.

Carlos A. F. Marques et al.

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Carlos A. F. Marques et al.

Model code and software

NMF3D - tridimensional normal mode functions Carlos A. F. Marques, Martinho Marta-Almeida, and José M. Castanheira (1)CESAM & Departamento de Física, Universidade de Aveiro. Aveiro, Portugal (2) Universidade de Vigo, Campus Lagoas-Marcosende, Vigo, Spain (3)Centro Oceanográfico de A Coruña, Instituto Español de Oceanografía, A Coruña, Spain https://doi.org/10.5281/zenodo.3631310

Carlos A. F. Marques et al.

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Latest update: 28 Mar 2020
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Short summary
A free software package for the computation of the 3-Dimensional Normal Modes of an hydrostatic atmosphere is presented. This software performs the computations in isobaric coordinates and was developed for two user friendly languages: MATLAB and Python. The software can be used to expand the global atmospheric circulation onto the 3-D Normal Modes.
A free software package for the computation of the 3-Dimensional Normal Modes of an hydrostatic...
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