Natl Sci Open
Volume 1, Number 2, 2022
Special Topic: Emerging Pollution and Emerging Pollutants
|Number of page(s)||19|
|Section||Earth and Environmental Sciences|
|Published online||17 August 2022|
South-hemispheric marine aerosol Hg and S isotope compositions reveal different oxidation pathways
State Key Laboratory of Environmental GeochemistryInstitute of GeochemistryChinese Academy of Sciences,
2 School of Earth System ScienceInstitute of Surface-Earth System ScienceTianjin University, Tianjin 300072, China
3 Joint International Research Laboratory of Atmospheric and Earth System SciencesSchool of Atmospheric SciencesNanjing University, Nanjing 210023, China
4 Key Laboratory of Geographic Information Science (Ministry of Education)School of Geographic Sciences and State Key Lab of Estuarine and Coastal ResearchEast China Normal University, Shanghai 200241, China
5 Polar Research Institute of China, Shanghai 200062, China
6 Géosciences Environnement ToulouseCNRS/IRD/Université Paul Sabatier Toulouse 3Toulouse, France
7 Laboratoire de Géochimie des Isotopes StablesInstitut de Physique du Globe de ParisUniversité Paris DiderotCNRS UMR 7154Sorbonne Paris-Cité1 rue de Jussieu, Paris 75005, France
8 School of Civil EngineeringTianjin University, Tianjin 300072, China
Accepted: 11 October 2021
Particle-bound mercury (PBM) records the oxidation of elemental mercury, of which the main oxidation pathways (Br∙/Cl∙/OH∙/O3) remain unclear, especially in the Southern Hemisphere. Here, we present latitudinal covariations of Hg and S-isotopic anomalies in cross-hemispheric marine aerosols that evidence an equator-to-poleward transition of Hg oxidants from OH∙/O3 in tropics to Br∙/Cl∙ in polar regions highlighting thus the presence of distinct oxidation processes producing PBM. The correlations between Hg, S and O-isotopic compositions measured in PBM, sulfates and nitrates respectively within the aerosols highlight the implication of common oxidants in their formations at different latitudes. Our results open a new window to better quantify the present-day atmospheric Hg, S and N budgets and to evaluate the influences of aerosols on climate and ecosystems once the isotopic fractionations associated with each process have been determined.
Key words: mercury / sulfur / aerosols / oxidation / mass independent fractionation / marine
© The Author(s) 2022. Published by China Science Publishing & Media Ltd. and EDP Sciences.
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