EGU21-11128, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-11128
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Geomagnetic activity effects on CO2‐driven trend in the thermosphere and ionosphere:  ideal model experiments with GAIA

Huixin Liu1, Chihiro Tao2, and Hidekatsu Jin2
Huixin Liu et al.
  • 1Kyushu University, Department of Earth and Planetary Sciences, Fukuoka, Japan (liu.huixin.295@m.kyushu-u.ac.jp)
  • 2NICT, Japan

We examine impacts of geomagnetic activity on CO2-driven trend in the Ionosphere and Thermosphere (IT) using the GAIA whole atmosphere model. The model reveals three salient features. (1) Geomagnetic activities usually weakens the CO2-driven trend at a fixed altitude. Among the IT parameters analyzed, the thermosphere mass density is the most robust indicator for CO2 cooling effect even with geomagnetic activity influences. (2) Geomagnetic activities can either strengthen or weaken the CO2-driven trend in hmF2 and NmF2, depending on local time and latitudes. This renders the widely used linear fitting methods invalid for removing geomagnetic effects from observations. (3) An interdependency exists between the efficiency of CO2 forcing and geomagnetic forcing, with the former enhances at lower geomagnetic activity level, while the latter enhances at higher CO2 concentration. This could imply that the CO2-driven trend would accelerate in periods of declining geomagnetic activity, while magnetic storms may have larger space weather impacts in the future with increasing CO2. These findings provide a preliminary model framework to understand interactions between the CO2 forcing from below and the geomagnetic forcing from above.

How to cite: Liu, H., Tao, C., and Jin, H.: Geomagnetic activity effects on CO2‐driven trend in the thermosphere and ionosphere:  ideal model experiments with GAIA, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11128, https://doi.org/10.5194/egusphere-egu21-11128, 2021.

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