[P-EM10] Coupling Processes in the Atmosphere-Ionosphere System

[PEM10-P08] The response of the ionosphere to increase of CO₂: simulation results with GAIA model

*Takamichi Abe¹, Huixin Liu², Yasunobu Miyoshi³ (1.Department of Earth and Planetary Sciences, Kyushu University, 2.Earth and Planetary Science Division, Kyushu University SERC, Kyushu University, 3.Department of Earth and Planetary Sciences, Faculity Sciences, Kyushu University)

Keywords:ionosphere, cooling effect

We investigated the influence of increasing CO₂ on the ionosphere by conducting two simulations with the atmosphere-ionospheric model of GAIA. This model indicated that trends of F₂ peak (N_mF₂ and H_mF₂) are negative in most locations under the CO₂ cooling effect. The global averaged magnitude of N_mF₂ negative effect is about -0.7%, but a number of positive locations cannot negligible. Trends of N_mF₂ are seasonally asymmetry; winter hemisphere tend to have positive trends while summer hemisphere tend to have negative trends during 12LT and 0LT. The trends of H_mF₂ are also negative in many locations, which global averaged magnitude is about -0.7km. Trends of H_mF₂ have positive only near geomagnetic dip equator.