The effects of non-linearity on themal tides in a 3-D numerical model

Details The effects of non-linearity on themal tides in a 3-D numerical model The effects of non-linearity on themal tides in a 3-D numerical model

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..101k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Feb. 1989, p. 101-110. Research supported by DFG.

Physics

7

Atmospheric Tides, Primitive Equations, Three Dimensional Models, Linear Equations, Nonlinear Equations, Solar Radiation

Scientific paper

Absorption of solar radiation is taken as the cause of atmospheric tides, which are simulated by a global three-dimensional primitive-equation model for the altitude region 0-120 km. To investigate nonlinear effects, two model versions are used, one with the complete nonlinear equation set, the other with the linear equation set. Tide simulations are then performed under the same conditions (background atmosphere and radiation for solstice) with both model versions and directly compared. The diurnal tide can be regarded as a linear phenomenon, whereas the semidiurnal tide is modified in lower latitudes above 65 km by nonlinear effects. Due to interaction of the tidal components with the background wind, a strong westward zonal flow is generated in the nonlinear model above 70 km.

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