Low-Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition

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Baccarini , A , Dommen , J , Lehtipalo , K , Henning , S , Modini , R L , Gysel-Beer , M , Baltensperger , U & Schmale , J 2021 , ' Low-Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition ' , Journal of Geophysical Research : Atmospheres , vol. 126 , no. 22 , e2021JD035126 . https://doi.org/10.1029/2021JD035126

Title: Low-Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition
Author: Baccarini, Andrea; Dommen, Josef; Lehtipalo, Katrianne; Henning, Silvia; Modini, Robin L.; Gysel-Beer, Martin; Baltensperger, Urs; Schmale, Julia
Contributor organization: Institute for Atmospheric and Earth System Research (INAR)
Date: 2021-11-27
Language: eng
Number of pages: 25
Belongs to series: Journal of Geophysical Research : Atmospheres
ISSN: 2169-897X
DOI: https://doi.org/10.1029/2021JD035126
URI: http://hdl.handle.net/10138/337643
Abstract: During summer, the Southern Ocean is largely unaffected by anthropogenic emissions, which makes this region an ideal place to investigate marine natural aerosol sources and processes. A better understanding of natural aerosol is key to constrain the preindustrial aerosol state and reduce the aerosol radiative forcing uncertainty in global climate models. We report the concentrations of gaseous sulfuric acid, iodic acid, and methanesulfonic acid (MSA) together with a characterization of new particle formation (NPF) events over a large stretch of the Southern Ocean. Measurements were conducted on board the Russian icebreaker Akademik Tryoshnikov from January to March 2017. Iodic acid is characterized by a particular diurnal cycle with reduced concentration around noon, suggesting a lower formation yield when solar irradiance is higher. Gaseous MSA does not have a diurnal cycle and measured concentrations in gas and condensed phase are compatible with this species being primarily produced via heterogeneous oxidation of dimethyl sulfide and subsequent partitioning into the gas phase. We also found that NPF in the boundary layer is mainly driven by sulfuric acid but it occurred very rarely over the vast geographical area probed and did not contribute to the cloud condensation nuclei budget in a directly observable manner. Despite the near absence of NPF events in the boundary layer, Aitken mode particles were frequently measured, supporting the hypothesis of a free tropospheric source. Iodic acid and MSA were not found to participate in nucleation, however, MSA may contribute to aerosol growth via heterogeneous formation in the aqueous phase.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion


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