| Dependence of Upper Atmosphere Photochemistry on the Shape of the Diurnal Cycle of the Photolysis Rates |
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| 作者姓名： | Sonia MONTECINOS Patricia BARRIENTOS |
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| 作者单位： | [1]Center of Advanced Studies in Arid Zones （CEAZA）, University of La Serena, La Serena, Chile [2]Department of Physics, University of La Frontera, Temuco, Chile |
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| 基金项目： | Acknowledgments. This work was supported by project EP2113, Universidad de La Frontera. |
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| 摘 要： | A photochemical model of the atmosphere constitutes a non–linear, non–autonomous dynamical system, enforced by the Earth’s rotation. Some studies have shown that the region of the mesopause tends towards non–linear responses such as period-doubling cascades and chaos. In these studies, simple approximations for the diurnal variations of the photolysis rates are assumed. The goal of this article is to investigate what happens if the more realistic, calculated photolysis rates are introduced. It is found that, if the usual approximations—sinusoidal and step fiunctions—are assumed, the responses of the system are similar: it converges to a 2–day periodic solution. If the more realistic, calculated diurnal cycle is introduced, a new 4–day subharmonic appear.
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| 关 键 词： | 动力学系统 分叉理论 光解率 光化学模型 大气科学 |
| 收稿时间： | 2004-12-08 |
| 修稿时间： | 2005-06-25 |
Dependence of upper atmosphere photochemistry on the shape of the diurnal cycle of the photolysis rates |
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| Sonia MONTECINOS,Patricia BARRIENTOS.Dependence of Upper Atmosphere Photochemistry on the Shape of the Diurnal Cycle of the Photolysis Rates[J].Advances in Atmospheric Sciences,2006,23(2):207-214. |
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| Authors: | Sonia Montecinos Patricia Barrientos |
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| Institution: | Center of Advanced Studies in Arid Zones (CEAZA), University of La Serena, La Serena, Chile,Department of Physics, University of La Frontera, Temuco, Chile |
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| Abstract: | A photochemical model of the atmosphere constitutes a non-linear, non-autonomous dynamical system, enforced by the Earth's rotation. Some studies have shown that the region of the mesopause tends towards non-linear responses such as period-doubling cascades and chaos. In these studies, simple approximations for the diurnal variations of the photolysis rates are assumed. The goal of this article is to investigate what happens if the more realistic, calculated photolysis rates are introduced. It is found that,if the usual approximations-sinusoidal and step fiunctions-are assumed, the responses of the system are similar: it converges to a 2-day periodic solution. If the more realistic, calculated diurnal cycle is introduced, a new 4-day subharmonic appear. |
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| Keywords: | photochemical models bifurcation theory numerical solutions dynamical systems |
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