Effects of Relative Humidity on Time-Resolved Molecular Characterization of Secondary Organic Aerosols from the OH-Initiated Oxidation of Cresol in the Presence of NOx

IF 10.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

环境科学与技术 Pub Date : 2025-01-16 DOI:10.1021/acs.est.4c08215

Cecilie Carstens, David M. Bell, Félix Sari Doré, Jens Top, Clément Dubois, Yanjun Zhang, Sébastien Perrier, Imad El Haddad, Matthieu Riva

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Abstract

While biomass burning (BB) is the largest source of fine particles in the atmosphere, the influence of relative humidity (RH) and photochemistry on BB secondary organic aerosol (BB-SOA) formation and aging remains poorly constrained. These effects need to be addressed to better capture and comprehend the evolution of BB-SOA in the atmosphere. Cresol (C₇H₈O) is used as a BB proxy to investigate these effects. It is emitted directly from BB and has been identified as a significant SOA precursor from residential wood-burning emissions. The gas- and particle-phase signal intensities are investigated using online mass spectrometers. An increase in the SOA mass yield of 7% is observed when the RH rises from 0.5–20 to 70–87%. At elevated RH, a significant increase in the formation of nitrogen-containing compounds is observed due to particle-phase processes. This is linked to a net decrease in the SOA viscosity, enabling these compounds to be formed to a greater extent at elevated RH in the presence of nitrogen oxides. These results highlight the importance of the particle water content for the molecular formation and aging of BB-SOA compounds.

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来源期刊

环境科学与技术环境科学-工程：环境

CiteScore

17.50

自引率

9.60%

发文量

12359

审稿时长

2.8 months

期刊介绍： Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.