On the Two-Day Oscillations in Global 3D-Modeling of the Chemical System of the Upper Mesosphere/Mesopause Region

Details On the Two-Day Oscillations in Global 3D-Modeling of the Chemical System of the Upper Mesosphere/Mesopause Region On the Two-Day Oscillations in Global 3D-Modeling of the Chemical System of the Upper Mesosphere/Mesopause Region

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa43a..01s&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA43A-01

Physics

0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3210 Modeling, 3220 Nonlinear Dynamics

Scientific paper

The integration of the photochemical system of the upper mesosphere/mesopause region brought evidence that the system is able to respond in a nonlinear manner under certain conditions. Under the action of the diurnally-periodic insolation, the system creates subharmonic oscillations or chaos if disregarding strong diffusion, and under special conditions it possesses multiple solutions. The models used in the past were simplified and idealized in view of the number of dimensions and the consideration of the full dynamics. On the basis of our global 3D-model of the dynamics and chemistry of the middle atmosphere (COMMA-IAP) we also found a nonlinear response in the photochemistry under realistic conditions. From our calculations we got period-2 oscillations of the photochemical system within confined latitudinal regions around the solstices but not during the equinoxes. We discuss these findings particularly in terms of the influence of realistic dynamics on the creation of nonlinear effects.

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