Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model download pdf
Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model download pdf
Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model by Lawrence L Takacs
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Author: Lawrence L Takacs
Page Count: 64 pages
Published Date: 02 Aug 2013
Publisher: Bibliogov
Publication Country: United States
Language: English
ISBN: 9781289276126
File size: 48 Mb
File Name: Technical.Report.Series.on.Global.Modeling.and.Data.Assimilation,.Volume.16.Filtering.Techniques.on.a.Stretched.Grid.General.Circulation.Model.pdf
Download Link: Technical Report Series on Global Modeling and Data Assimilation, Volume 16 Filtering Techniques on a Stretched Grid General Circulation Model
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This report documents the techniques used to filter quantities on a stretched grid general circulation model. Standard high-latitude filtering techniques (e.g., using an FFT (Fast Fourier Transformations) to decompose and filter unstable harmonics at selected latitudes) applied on a stretched grid are shown to produce significant distortions of the prognostic state when used to control instabilities near the pole. A new filtering technique is developed which accurately accounts for the non-uniform grid by computing the eigenvectors and eigenfrequencies associated with the stretching. A filter function, constructed to selectively damp those modes whose associated eigenfrequencies exceed some critical value, is used to construct a set of grid-spaced weights which are shown to effectively filter without distortion. Both offline and GCM (General Circulation Model) experiments are shown using the new filtering technique. Finally, a brief examination is also made on the impact of applying the Shapiro filter on the stretched grid.
Read online Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model Buy Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model Download Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model
Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model by Lawrence L Takacs
Author: Lawrence L Takacs
Page Count: 64 pages
Published Date: 02 Aug 2013
Publisher: Bibliogov
Publication Country: United States
Language: English
ISBN: 9781289276126
File size: 48 Mb
File Name: Technical.Report.Series.on.Global.Modeling.and.Data.Assimilation,.Volume.16.Filtering.Techniques.on.a.Stretched.Grid.General.Circulation.Model.pdf
Download Link: Technical Report Series on Global Modeling and Data Assimilation, Volume 16 Filtering Techniques on a Stretched Grid General Circulation Model
---------------------------------------------------------------
This report documents the techniques used to filter quantities on a stretched grid general circulation model. Standard high-latitude filtering techniques (e.g., using an FFT (Fast Fourier Transformations) to decompose and filter unstable harmonics at selected latitudes) applied on a stretched grid are shown to produce significant distortions of the prognostic state when used to control instabilities near the pole. A new filtering technique is developed which accurately accounts for the non-uniform grid by computing the eigenvectors and eigenfrequencies associated with the stretching. A filter function, constructed to selectively damp those modes whose associated eigenfrequencies exceed some critical value, is used to construct a set of grid-spaced weights which are shown to effectively filter without distortion. Both offline and GCM (General Circulation Model) experiments are shown using the new filtering technique. Finally, a brief examination is also made on the impact of applying the Shapiro filter on the stretched grid.
Read online Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model Buy Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model Download Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Technical Report Series on Global Modeling and Data Assimilation, Volume 16 : Filtering Techniques on a Stretched Grid General Circulation Model