The upper troposphere and lower stratosphere (UTLS) are particularly sensitive to changes in chemical composition. This region is very important for the radiation budget of the Earth’s atmosphere, and most long-haul air traffic takes place in it. In order to correctly classify the impact of aviation, it is important to understand the background atmosphere where aviation emissions are released.
The Asian monsoon is generally known as a regional and seasonal weather event that can sometimes cause great destruction through extreme rainfall. Less well known is that the monsoon is an important transport route for trace substances into the upper troposphere and lower stratosphere. Thus, heavily polluted air masses reach the tropopause region and are then distributed over the entire northern hemisphere. The UTLS is a region that is particularly sensitive to changes and is of great importance for the radiation budget of the Earth’s atmosphere.
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