Speaker
Dr
Niilo Kalakoski
(FMI, FI)
Description
The transport of mesospheric nitrogen oxides (NO$_\mathrm{x}$), produced by energetic electron precipitation (EEP), down to stratosphere during polar winter is expected to increase in the future due to acceleration of mean meridional circulation. In stratosphere, the transported NO$_\mathrm{x}$ is known to contribute to the catalytic ozone losses in late winter and early spring.
We use Whole Atmosphere Community Climate Model with expanded D-region ion chemistry package (WACCM-D) to study the 21st century polar circulation and transport of mesospheric NO$_\mathrm{x}$ during polar winter. Introduction of D-region ion chemistry reactions in the place of standard parameterization enhances the mesospheric production of NO$_\mathrm{x}$.
Author
Dr
Niilo Kalakoski
(FMI, FI)
Co-authors
Dr
Monika Szelag
(FMI, FI)
Prof.
Pekka Verronen
(FMI, FI)