| Autor: |
Alex O. Gonzalez, Matthew T. Masarik, Levi G. Silvers, Wayne Schubert |
| Jazyk: |
angličtina |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Journal of Advances in Modeling Earth Systems, Vol 1, Pp Art. #3-11 pp. (2009) |
| Druh dokumentu: |
article |
| ISSN: |
1942-2466 |
| DOI: |
10.3894/JAMES.2009.1.3 |
| Popis: |
Large-scale tropical phenomena such as the Madden-Julian Oscillation (MJO) and El Nino-Southern Oscillation (ENSO) are often studied using the longwave approximation to equatorial β-plane theory. This approximation involves the neglect of the (∂v/∂t) term in the meridional momentum equation. The approximation does not distort Kelvin waves, completely filters inertia-gravity waves, is reasonably accurate for long Rossby waves, but greatly distorts short Rossby waves. Here we present an improvement of the longwave model, based on an approximation of the (∂v/∂t) term rather than its complete neglect. The new model is similar to the longwave model in the sense that it does not distort Kelvin waves and completely filters inertia-gravity waves. However, it differs from the longwave model in the sense that it accurately describes Rossby waves of all wavelengths, thus making it a useful tool for the study of a wider range of tropical phenomena than just the MJO and ENSO. Although most of the mathematical analysis performed here is in the context of equatorial β-plane theory, we briefly discuss how the ideas can be generalized to spherical geometry. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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