Articles | Volume 21, issue 17
Atmos. Chem. Phys., 21, 13455–13481, 2021
https://doi.org/10.5194/acp-21-13455-2021

Special issue: StratoClim stratospheric and upper tropospheric processes...

Atmos. Chem. Phys., 21, 13455–13481, 2021
https://doi.org/10.5194/acp-21-13455-2021

Research article 10 Sep 2021

Research article | 10 Sep 2021

In situ observation of new particle formation (NPF) in the tropical tropopause layer of the 2017 Asian monsoon anticyclone – Part 2: NPF inside ice clouds

Ralf Weigel et al.

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Latest update: 17 Oct 2021
Short summary
In July and August 2017, the StratoClim mission took place in Nepal with eight flights of the M-55 Geophysica at up to 20 km in the Asian monsoon anticyclone. New particle formation (NPF) next to cloud ice was detected in situ by abundant nucleation-mode aerosols (> 6 nm) along with ice particles (> 3 µm). NPF was observed mainly below the tropopause, down to 15 % being non-volatile residues. Observed intra-cloud NPF indicates its importance for the composition in the tropical tropopause layer.
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