@Article{GonçalvesJúniorWCEHMSLGG:2021:MoCaNi,
author = "Gon{\c{c}}alves J{\'u}nior, S{\'e}rgio J. and Weis, Johannes
and China, Swarup and Evangelista, Heitor and Harder, Tristan H.
and M{\"u}ller, Simon and Sampaio, Marcelo and Laskin, Alexander
and Gilles, Mary K. and Godoi, Ricardo H. M.",
affiliation = "{Universidade Federal do Paran{\'a} (UFPR)} and {Lawrence
Berkeley National Laboratory} and {Pacific Northwest National
Laboratory} and {Universidade do Estado do Rio de Janeiro (UERJ)}
and {Lawrence Berkeley National Laboratory} and {Lawrence Berkeley
National Laboratory} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Pacific Northwest National Laboratory} and
{Lawrence Berkeley National Laboratory} and {Universidade Federal
do Paran{\'a} (UFPR)}",
title = "Photochemical reactions on aerosols at West Antarctica: A
molecular case-study of nitrate formation among sea salt
aerosols",
journal = "Science of the Total Environment",
year = "2021",
volume = "758",
pages = "e143586",
month = "Mar.",
keywords = "Antarctica aerosols, Snowpack, Photochemical reactions, Molecular
speciation, Single particles, Nitrates aerosol.",
abstract = "Environmental implications of climate change are complex and
exhibit regional variations both within and between the polar
regions. The increase of solar UV radiation flux over Antarctica
due to stratospheric ozone depletion creates the optimal
conditions for photochemical reactions on the snow. Modeling,
laboratory, and indirect field studies suggest that snowpack
process release gases to the atmosphere that can react on sea salt
particles in remote regions such as Antarctica, modifying aerosol
composition and physical properties of aerosols. Here, we present
evidence of photochemical processing in West Antarctica aerosols
using microscopic and chemical speciation of individual
atmospheric particles. Individual aerosol particles collected at
the Brazilianmodule Criosfera 1were analyzed by scanning
transmission X-ray microscopy with near edge X-ray absorption fine
structure spectroscopy (STXM/NEXAFS) combined with
computer-controlled scanning electron microscopy (CCSEM) with
energy-dispersive X-ray (EDX) microanalysis. The displacement of
chlorine relative to sodium was observed over most of the sea salt
particles. Particles with a chemical composition consistent with
NaCl-NO3 contributed up to 30% of atmospheric particles
investigated. Overall, this study provides evidence that the
snowpack and particulate nitrate photolysis should be considered
in dynamic partition equilibrium in the troposphere. These
findings may assist in reducing modeling uncertainties and present
new insights into the aerosol chemical composition in the polar
environment.",
doi = "10.1016/j.scitotenv.2020.143586",
url = "http://dx.doi.org/10.1016/j.scitotenv.2020.143586",
issn = "0048-9697",
language = "en",
targetfile = "goncalves_photochemical.pdf",
urlaccessdate = "05 jun. 2024"
}