Stratospheric air intrusions promote global-scale new particle formation-Reference-Cited by-同舟云学术

Stratospheric air intrusions promote global-scale new particle formation

Published:2024-07-12 Issue:6705 Volume:385 Page:210-216
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Zhang Jiaoshi¹^ORCID,Gong Xianda¹^ORCID,Crosbie Ewan²³^ORCID,Diskin Glenn²^ORCID,Froyd Karl⁴⁵^ORCID,Hall Samuel⁶^ORCID,Kupc Agnieszka⁴⁵⁷^ORCID,Moore Richard²^ORCID,Peischl Jeff⁴⁵^ORCID,Rollins Andrew⁵^ORCID,Schwarz Joshua⁵^ORCID,Shook Michael²^ORCID,Thompson Chelsea⁴⁵^ORCID,Ullmann Kirk⁶^ORCID,Williamson Christina⁴⁵⁸⁹^ORCID,Wisthaler Armin¹⁰¹¹^ORCID,Xu Lu¹^ORCID,Ziemba Luke²^ORCID,Brock Charles A.⁵^ORCID,Wang Jian¹^ORCID

Affiliation:

1. Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, USA.

2. NASA Langley Research Center, Hampton, VA, USA.

3. Science Systems and Applications, Inc., Hampton, VA, USA.

4. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.

5. Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA.

6. Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA.

7. Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Vienna, Austria.

8. Climate Research Programme, Finnish Meteorological Institute, Helsinki, Finland.

9. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland.

10. Institute for Ion Physics and Applied Physics, University of Innsbruck, Innsbruck, Austria.

11. Department of Chemistry, University of Oslo, Oslo, Norway.

Abstract

New particle formation in the free troposphere is a major source of cloud condensation nuclei globally. The prevailing view is that in the free troposphere, new particles are formed predominantly in convective cloud outflows. We present another mechanism using global observations. We find that during stratospheric air intrusion events, the mixing of descending ozone-rich stratospheric air with more moist free tropospheric background results in elevated hydroxyl radical (OH) concentrations. Such mixing is most prevalent near the tropopause where the sulfur dioxide (SO 2 ) mixing ratios are high. The combination of elevated SO 2 and OH levels leads to enhanced sulfuric acid concentrations, promoting particle formation. Such new particle formation occurs frequently and over large geographic regions, representing an important particle source in the midlatitude free troposphere.

Publisher

American Association for the Advancement of Science (AAAS)

Link

https://www.science.org/doi/pdf/10.1126/science.adn2961

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