Stratospheric ozone depletion in the Antarctic region triggers intense changes in sea salt aerosol geochemistry

Gonçalves Jr, Sérgio J.; Evangelista, Heitor; Weis, Johannes; Harder, Tristan H.; China, Swarup; Müller, Simon; Marques, Magdalena M.; Magalhães Neto, Newton de; Passos, Heber R.; Sampaio, Marcelo; Simões, Jefferson C.; Ximenes de Oliveira, Bruno Vinícius; Yamamoto, Carlos I.; Laskin, Alexander; Gilles, Mary K.; Godoi, Ricardo H. M.

doi:10.1038/s43247-023-00739-z

Title: Stratospheric ozone depletion in the Antarctic region triggers intense changes in sea salt aerosol geochemistry

Journal Article · 15 March 2023 · Communications Earth & Environment

DOI: https://doi.org/10.1038/s43247-023-00739-z · OSTI ID:1961865

; Evangelista, Heitor;

; Harder, Tristan H.; China, Swarup; Müller, Simon; Marques, Magdalena M.; Magalhães Neto, Newton de; Passos, Heber R.;

;

; Yamamoto, Carlos I.;

;

; Godoi, Ricardo H. M.

Abstract Since the early 1980s, the Antarctic environment has served as a natural field laboratory for researchers to investigate the effects of stratospheric ozone depletion, which has resulted in increased surface ultraviolet radiation levels. However, its effective threats still present gaps. We report new pieces of evidence of increased ultraviolet radiation impacting West Antarctica sea salt aerosols. Salt aerosols, particularly in the Southern Ocean Sea, play an important role in the radiative earth balance. To disclose the molecular details of sea salt aerosols, we used a synchrotron-based multi-element microscopic speciation of individual microparticles (Scanning Transmission X-ray Microscopy with Near-Edge X-ray Absorption Fine Structure Spectroscopy combined with Computer-Controlled Scanning Electron Microscopy). Here we identified substantial abundances of chlorine-enriched aerosols in sea salt generated by photolytic products, whereas ice core records revealed increased chlorine depletion from the onset of ozone depletion. Our findings reveal that modern sea salt modification has no Holocene precedent.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231; AC05-76RL01830

OSTI ID:: 1961865

Report Number(s):: PNNL-SA-183687; 77; PII: 739

Journal Information:: Communications Earth & Environment, Journal Name: Communications Earth & Environment Journal Issue: 1 Vol. 4; ISSN 2662-4435

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
Antarctic
aerosol
atmospheric chemistry
sea salt

Title: Stratospheric ozone depletion in the Antarctic region triggers intense changes in sea salt aerosol geochemistry

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