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Dependence of Upper Atmosphere Photochemistry on the Shape of the Diurnal Cycle of the Photolysis Rates

Dependence of Upper Atmosphere Photochemistry on the Shape of the Diurnal Cycle of the Photolysis Rates
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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 axe similar: it converges to a 2-day periodic solution. If the more realistic, calculated diurnal cycle is introduced, a new 4-day subharmonic appear. 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 axe similar: it converges to a 2-day periodic solution. If the more realistic, calculated diurnal cycle is introduced, a new 4-day subharmonic appear.
出处 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2006年第2期207-214,共8页 大气科学进展(英文版)
关键词 photochemical models bifurcation theory numerical solutions dynamical systems photochemical models, bifurcation theory, numerical solutions, dynamical systems
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