Photochemical Cloud Processing of Primary Wildfire Emissions as a Potential Source of Secondary Organic Aerosol

Environmental Science & Technology
Sophie TomazBarbara J Turpin

Abstract

We investigated the gas-phase chemical composition of biomass burning (BB) emissions and their role in aqueous secondary organic aerosol (aqSOA) formation through photochemical cloud processing. A high-resolution time-of-flight chemical ionization mass spectrometer using iodide reagent ion chemistry detected more than 100 gas-phase compounds from the emissions of 30 different controlled burns during the 2016 Fire Influence on Regional and Global Environments Experiment (FIREX) at the Fire Science Laboratory. Compounds likely to partition to cloudwater were selected based on high atomic oxygen-to-carbon ratio and abundance. Water solubility was confirmed by detection of these compounds in water after mist chamber collection during controlled burns and analysis using ion chromatography and electrospray ionization interfaced to high-resolution time-of-flight mass spectrometry. Known precursors of aqSOA were found in the primary gaseous BB emissions (e.g., phenols, acetate, and pyruvate). Aqueous OH oxidation of the complex biomass burning mixtures led to rapid depletion of many compounds (e.g., catechol, levoglucosan, methoxyphenol) and formation of others (e.g., oxalate, malonate, mesoxalate). After 150 min of oxidation (approxim...Continue Reading

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Citations

Apr 11, 2019·Environmental Science. Processes & Impacts·Michael David LeslieNadine Borduas-Dedekind
May 28, 2020·Physical Chemistry Chemical Physics : PCCP·Dorit ShemeshR Benny Gerber
Oct 7, 2020·Environmental Science. Processes & Impacts·Elijah G SchnitzlerJonathan P D Abbatt
Jan 13, 2021·Proceedings of the National Academy of Sciences of the United States of America·Marshall BurkeMichael Wara
Sep 16, 2020·The Journal of Physical Chemistry. a·Md Sohel Rana, Marcelo I Guzman
Oct 11, 2019·Environmental Science & Technology·Claire E BuysseDaniel A Jaffe

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