A variable resolution global spectral model
A conformal transformation suggested by F. Schimdt is followed to implement a global spectral model with variable horizontal resolution. A conformal mapping is defined between the real physical sphere (Earth) to a transformed (Computational) sphere. The model equations are discretized on the computa...
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ftfloridasu:oai:diginole.lib.fsu.edu:fsu_77348 2024-06-09T07:48:27+00:00 A variable resolution global spectral model Hardiker, Vivek Manohar. Florida State University 1994 223 p. https://diginole.lib.fsu.edu/islandora/object/fsu%3A77348/datastream/TN/view/A%20variable%20resolution%20global%20spectral%20model.jpg eng eng Dissertation Abstracts International fsu:77348 (UnM) AAI9516732 (IID) FSDT3088546 (fedora) fsu:77348 https://diginole.lib.fsu.edu/islandora/object/fsu%3A77348/datastream/TN/view/A%20variable%20resolution%20global%20spectral%20model.jpg On campus use only. Physics Atmospheric Science Text 1994 ftfloridasu 2024-05-10T08:08:12Z A conformal transformation suggested by F. Schimdt is followed to implement a global spectral model with variable horizontal resolution. A conformal mapping is defined between the real physical sphere (Earth) to a transformed (Computational) sphere. The model equations are discretized on the computational sphere and the conventional spectral technique is applied to solve the model equations. There are two types of transformations used in the present study, namely, the Stretching transformation and the Rotation of the horizontal grid points. Application of the stretching transformation results in finer resolution along the meridional direction. The stretching is controlled by a parameter C. The rotation transformation can be used to relocate the North Pole of the model to any point on the geographic sphere. The idea is now to rotate the pole to the area of interest and refine the resolution around the new pole by applying the stretching transformation. The stretching transformation can be applied alone without the rotation. A T-42 Spectral Shallow-Water model is transformed by applying the stretching transformation alone as well as the two transformations together. A T-42 conventional Spectral Shallow-Water model is run as the control experiment and a conventional T-85 Spectral Shallow-Water model run is treated as the benchmark (Truth) solution. RMS error analysis for the geopotential field as well as the wind field is performed to evaluate the forecast made by the transformed model. It is observed that the RMS error of the transformed model is lower than that of the control run in a latitude band, for the case of stretching transformation alone, while for the total transformation (rotation followed by stretching), similar results are obtained for a rectangular domain. A multi-level global spectral model is designed from the current FSU global spectral model in order to implement the conformal transformation. The transformed T-85 model is used to study Hurricane Andrew. The control experiment in this study ... Text North Pole Florida State University: DigiNole Commons North Pole |
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Florida State University: DigiNole Commons |
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English |
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Physics Atmospheric Science |
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Physics Atmospheric Science A variable resolution global spectral model |
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Physics Atmospheric Science |
description |
A conformal transformation suggested by F. Schimdt is followed to implement a global spectral model with variable horizontal resolution. A conformal mapping is defined between the real physical sphere (Earth) to a transformed (Computational) sphere. The model equations are discretized on the computational sphere and the conventional spectral technique is applied to solve the model equations. There are two types of transformations used in the present study, namely, the Stretching transformation and the Rotation of the horizontal grid points. Application of the stretching transformation results in finer resolution along the meridional direction. The stretching is controlled by a parameter C. The rotation transformation can be used to relocate the North Pole of the model to any point on the geographic sphere. The idea is now to rotate the pole to the area of interest and refine the resolution around the new pole by applying the stretching transformation. The stretching transformation can be applied alone without the rotation. A T-42 Spectral Shallow-Water model is transformed by applying the stretching transformation alone as well as the two transformations together. A T-42 conventional Spectral Shallow-Water model is run as the control experiment and a conventional T-85 Spectral Shallow-Water model run is treated as the benchmark (Truth) solution. RMS error analysis for the geopotential field as well as the wind field is performed to evaluate the forecast made by the transformed model. It is observed that the RMS error of the transformed model is lower than that of the control run in a latitude band, for the case of stretching transformation alone, while for the total transformation (rotation followed by stretching), similar results are obtained for a rectangular domain. A multi-level global spectral model is designed from the current FSU global spectral model in order to implement the conformal transformation. The transformed T-85 model is used to study Hurricane Andrew. The control experiment in this study ... |
author2 |
Hardiker, Vivek Manohar. Florida State University |
format |
Text |
title |
A variable resolution global spectral model |
title_short |
A variable resolution global spectral model |
title_full |
A variable resolution global spectral model |
title_fullStr |
A variable resolution global spectral model |
title_full_unstemmed |
A variable resolution global spectral model |
title_sort |
variable resolution global spectral model |
publishDate |
1994 |
url |
https://diginole.lib.fsu.edu/islandora/object/fsu%3A77348/datastream/TN/view/A%20variable%20resolution%20global%20spectral%20model.jpg |
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North Pole |
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North Pole |
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North Pole |
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Dissertation Abstracts International fsu:77348 (UnM) AAI9516732 (IID) FSDT3088546 (fedora) fsu:77348 https://diginole.lib.fsu.edu/islandora/object/fsu%3A77348/datastream/TN/view/A%20variable%20resolution%20global%20spectral%20model.jpg |
op_rights |
On campus use only. |
_version_ |
1801380176116842496 |