[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

[PEM12-12] Impact of El Nino-induced tropospheric ozone modulation on tides

*Huixin Liu¹、Masaru Kogure¹、Hidekatsu Jin² (1.Earth and Planetary Science Division, Kyushu University、2.National Institute for Communication and Technology (NICT))

キーワード：atmosphere tides in MLT, troposphere ozone, tidal generation

To assess the impacts of the tropospheric ozone modulation due to El Niño on tides, we performed two simulations by using the GAIA model: zonally symmetric ozone density and longitudinal ozone variation of an El Niño pattern. Our results show that the ozone modulation strengthens (attenuates) the first symmetric mode of the DW2 (D0 and DW1) tide by ~+5% (~-1% and ~-4%) from ~20 km to ~100 km altitudes on average. These responses are probably attributed to the tropospheric ozone modulation. These responses are reasonable because both the ozone modulation and these first modes have a peak in the equator. Also, the vertical wavelengths of the first modes are about twice as long as the vertical thickness of the ozone modulation. Our results suggest that the ozone modulation due to El Niño influences the diurnal tides by a few percent because of the ozone modulation spatial structure.