[P-EM11] [EE] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

[PEM11-P17] Thermosphere response to doubling CO2: simulation results with GAIA model

*中本 雄介¹、Liu Huixin¹、Miyoshi Yasunobu¹ (1.九州大学大学院理学府地球惑星科学専攻)

キーワード：thermosphere, CO2, vertical coupling

Using the whole atmosphere model GAIA, we investigate the influence of doubling CO2 on the thermosphere. Our results reveal consist cooling in the upper thermosphere as reported in previous work. Furthermore, we find that the cooling effect has distinct spatial and seasonal variation. First, it is stronger in polar regions than at lower latitudes. Second, it is stronger in local summer than in local winter. Third, it is stronger at night than at day. We investigate the mechanism for these variations by examining changes in the global circulation and composition.