Tracing elevated abundance of CH 2 Cl 2 in the subarctic upper troposphere to the Asian Summer Monsoon
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Le résumé fourni par la source
The Asian Summer Monsoon (ASM) is a seasonal weather pattern characterized by heavy rains and winds, mainly affecting South and Southeast Asia during the summer months. The deep convection within the ASM is an important transport process for pollutants from the planetary boundary layer up to the tropopause region. This study uses in situ observations of CH 2 Cl 2 from the PHILEAS (Probing High Latitude Export of Air from the Asian Summer Monsoon) aircraft campaign in late summer 2023 to examine the transport pathways and timescales for polluted air from the ASM to the extratropical upper troposphere and lower stratosphere (UTLS). CH 2 Cl 2 mixing ratios of up to 300 ppt (≈ 500 % of the Northern Hemisphere background) were measured in the upper troposphere in the subarctic region. The three largest observed pollution events were analyzed with the help of the Lagrangian particle dispersion model FLEXPART, both in terms of their origin and their potential entry into the lower stratosphere. The results show that the East Asian Summer Monsoon (EASM) is the key pathway for transporting uncontrolled short-lived chlorinated substances (Cl-VSLSs) into the tropopause region, which contributes to an increase in tropospheric background levels with the potential to enter the lower stratosphere. The transport analysis of elevated mixing ratios shown here suggests that transport to the upper troposphere in the subarctic region did not occur through transport into the Asian Summer Monsoon Anticyclone (ASMA) with subsequent eddy-shedding events but rather by large convective transport contributions from the EASM. The projected entry into the lower stratosphere in the following days amounts to a few percent, indicating that the direct influence of these particular events on the lower stratosphere is probably minor.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Tracing elevated abundance of CH <sub>2</sub> Cl <sub>2</sub> in the subarctic upper troposphere to the Asian Summer Monsoon
- Date Crossref
- 29/07/2025
- Éditeur
- Copernicus GmbH
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Goethe University Frankfurt pays non établi dans la noticeUniversité ou école supérieure
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University of Wuppertal Institute for Atmospheric and Environmental Research pays non établi dans la noticeUniversité ou école supérieure
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Johannes Gutenberg University Mainz pays non établi dans la noticeUniversité ou école supérieure
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Max Planck Institute for Chemistry Atmospheric Chemistry Department pays non établi dans la noticeStructure de recherche
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University of Frankfurt Institute for Atmospheric and Environmental Sciences pays non établi dans la noticeUniversité ou école supérieure
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Johannes Gutenberg University of Mainz Institute for Atmospheric Physics pays non établi dans la noticeUniversité ou école supérieure
Goethe University Frankfurt, Institute for Atmospheric and Environmental Research — University of Wuppertal et Johannes Gutenberg University Mainz, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.