Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves
Comparisons of amplitudes of wave variations of atmospheric characteristics obtained using direct numerical simulation models with polarization relations given by conventional theories of linear acoustic-gravity waves (AGWs) could be helpful for testing these numerical models. In this study, we perf...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-06-01
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| Series: | Geoscientific Model Development |
| Online Access: | http://www.geosci-model-dev.net/8/1831/2015/gmd-8-1831-2015.pdf |
| _version_ | 1818162641530519552 |
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| author | N. M. Gavrilov S. P. Kshevetskii A. V. Koval |
| author_facet | N. M. Gavrilov S. P. Kshevetskii A. V. Koval |
| author_sort | N. M. Gavrilov |
| collection | DOAJ |
| description | Comparisons of amplitudes of wave variations of atmospheric characteristics
obtained using direct numerical simulation models with polarization relations
given by conventional theories of linear acoustic-gravity waves (AGWs) could
be helpful for testing these numerical models. In this study, we performed
high-resolution numerical simulations of nonlinear AGW propagation at
altitudes 0–500 km from a plane wave forcing at the Earth's surface and
compared them with analytical polarization relations of linear AGW theory.
After some transition time <i>t<sub>e</sub></i> (increasing with altitude) subsequent to
triggering the wave source, the initial wave pulse disappears and the main
spectral components of the wave source dominate. The numbers of numerically
simulated and analytical pairs of AGW parameters, which are equal with
confidence of 95 %, are largest at altitudes 30–60 km at
<i>t</i> > <i>t<sub>e</sub></i>. At low and high altitudes and at <i>t</i> < <i>t<sub>e</sub></i>,
numbers of equal pairs are smaller, because of the influence of the lower
boundary conditions, strong dissipation and AGW transience making substantial
inclinations from conditions, assumed in conventional theories of linear
nondissipative stationary AGWs in the free atmosphere. Reasonable agreements
between simulated and analytical wave parameters satisfying the scope of the
limitations of the AGW theory prove the adequacy of the used wave numerical
model. Significant differences between numerical and analytical AGW
parameters reveal circumstances when analytical theories give substantial
errors and numerical simulations of wave fields are required. In addition,
direct numerical AGW simulations may be useful tools for testing simplified
parameterizations of wave effects in the atmosphere. |
| first_indexed | 2024-12-11T16:36:54Z |
| format | Article |
| id | doaj.art-6d9e27405c8b4c7b9670d64e7b76bee3 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-11T16:36:54Z |
| publishDate | 2015-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-6d9e27405c8b4c7b9670d64e7b76bee32022-12-22T00:58:25ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032015-06-01861831183810.5194/gmd-8-1831-2015Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity wavesN. M. Gavrilov0S. P. Kshevetskii1A. V. Koval2Atmospheric Physics Department, Saint-Petersburg State University, Saint-Petersburg, RussiaTheoretical Physics Department, Immanuel Kant Baltic Federal University, Kaliningrad, RussiaAtmospheric Physics Department, Saint-Petersburg State University, Saint-Petersburg, RussiaComparisons of amplitudes of wave variations of atmospheric characteristics obtained using direct numerical simulation models with polarization relations given by conventional theories of linear acoustic-gravity waves (AGWs) could be helpful for testing these numerical models. In this study, we performed high-resolution numerical simulations of nonlinear AGW propagation at altitudes 0–500 km from a plane wave forcing at the Earth's surface and compared them with analytical polarization relations of linear AGW theory. After some transition time <i>t<sub>e</sub></i> (increasing with altitude) subsequent to triggering the wave source, the initial wave pulse disappears and the main spectral components of the wave source dominate. The numbers of numerically simulated and analytical pairs of AGW parameters, which are equal with confidence of 95 %, are largest at altitudes 30–60 km at <i>t</i> > <i>t<sub>e</sub></i>. At low and high altitudes and at <i>t</i> < <i>t<sub>e</sub></i>, numbers of equal pairs are smaller, because of the influence of the lower boundary conditions, strong dissipation and AGW transience making substantial inclinations from conditions, assumed in conventional theories of linear nondissipative stationary AGWs in the free atmosphere. Reasonable agreements between simulated and analytical wave parameters satisfying the scope of the limitations of the AGW theory prove the adequacy of the used wave numerical model. Significant differences between numerical and analytical AGW parameters reveal circumstances when analytical theories give substantial errors and numerical simulations of wave fields are required. In addition, direct numerical AGW simulations may be useful tools for testing simplified parameterizations of wave effects in the atmosphere.http://www.geosci-model-dev.net/8/1831/2015/gmd-8-1831-2015.pdf |
| spellingShingle | N. M. Gavrilov S. P. Kshevetskii A. V. Koval Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves Geoscientific Model Development |
| title | Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves |
| title_full | Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves |
| title_fullStr | Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves |
| title_full_unstemmed | Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves |
| title_short | Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves |
| title_sort | verifications of the high resolution numerical model and polarization relations of atmospheric acoustic gravity waves |
| url | http://www.geosci-model-dev.net/8/1831/2015/gmd-8-1831-2015.pdf |
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