Large contribution to secondary organic aerosol from isoprene cloud chemistry.

Autor:	Lamkaddam H; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland. houssni.lamkaddam@psi.ch imad.el-haddad@psi.ch urs.baltensperger@psi.ch., Dommen J; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland., Ranjithkumar A; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK., Gordon H; Engineering Research Accelerator, Carnegie Mellon University, Pittsburgh 15213, USA., Wehrle G; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland., Krechmer J; Aerodyne Research Inc., Billerica, MA 01821, USA., Majluf F; Aerodyne Research Inc., Billerica, MA 01821, USA., Salionov D; Bioenergy and Catalysis Laboratory, Paul Scherrer Institute, 5232 Villigen, Switzerland., Schmale J; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland.; School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland., Bjelić S; Bioenergy and Catalysis Laboratory, Paul Scherrer Institute, 5232 Villigen, Switzerland., Carslaw KS; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK., El Haddad I; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland. houssni.lamkaddam@psi.ch imad.el-haddad@psi.ch urs.baltensperger@psi.ch., Baltensperger U; Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland. houssni.lamkaddam@psi.ch imad.el-haddad@psi.ch urs.baltensperger@psi.ch.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2021 Mar 24; Vol. 7 (13). Date of Electronic Publication: 2021 Mar 24 (Print Publication: 2021).
DOI:	10.1126/sciadv.abe2952
Abstrakt:	Aerosols still present the largest uncertainty in estimating anthropogenic radiative forcing. Cloud processing is potentially important for secondary organic aerosol (SOA) formation, a major aerosol component: however, laboratory experiments fail to mimic this process under atmospherically relevant conditions. We developed a wetted-wall flow reactor to simulate aqueous-phase processing of isoprene oxidation products (iOP) in cloud droplets. We find that 50 to 70% (in moles) of iOP partition into the aqueous cloud phase, where they rapidly react with OH radicals, producing SOA with a molar yield of 0.45 after cloud droplet evaporation. Integrating our experimental results into a global model, we show that clouds effectively boost the amount of SOA. We conclude that, on a global scale, cloud processing of iOP produces 6.9 Tg of SOA per year or approximately 20% of the total biogenic SOA burden and is the main source of SOA in the mid-troposphere (4 to 6 km). (Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
Databáze:	MEDLINE
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