Articles | Volume 22, issue 3
Atmos. Chem. Phys., 22, 2049–2077, 2022

Special issue: WISE: Wave-driven isentropic exchange in the extratropical...

Atmos. Chem. Phys., 22, 2049–2077, 2022

Research article 14 Feb 2022

Research article | 14 Feb 2022

In situ observations of CH2Cl2 and CHCl3 show efficient transport pathways for very short-lived species into the lower stratosphere via the Asian and the North American summer monsoon

Valentin Lauther et al.

Data sets

HALO database K.-D. Gottschaldt and M. Rapp

The ALE/GAGE/AGAGE Network (DB1001) R. Prinn, R. Weiss, P. Krummel, S. O'Doherty, and J. Muhle

The ERA-Interim archive Version 2.0 P. Berrisford, D. P. Dee, P. Poli, R. Brugge, M. Fielding, M. Fuentes, P. W. Kållberg, S. Kobayashi, S. Uppala, and A. Simmons

Short summary
We show airborne in situ measurements of the very short-lived ozone-depleting substances CH2Cl2 and CHCl3, revealing particularly high concentrations of both species in the lower stratosphere. Back-trajectory calculations and 3D model simulations show that the air masses with high concentrations originated in the Asian boundary layer and were transported via the Asian summer monsoon. We also identify a fast transport pathway into the stratosphere via the North American monsoon and by hurricanes.
Final-revised paper