相对湿度对NOx存在下甲酚oh引发氧化产生的二次有机气溶胶时间分辨分子表征的影响

IF 11.3 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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引用次数: 0

摘要

虽然生物质燃烧（BB）是大气中细颗粒物的最大来源，但相对湿度（RH）和光化学对BB次生有机气溶胶（BB- soa）形成和老化的影响尚不清楚。为了更好地捕捉和理解环境中BB-SOA的发展，需要解决这些影响。甲酚（c7h80）被用作BB代理来研究这些影响。它直接从BB排放，并已被确定为住宅木材燃烧排放的重要SOA前兆。利用在线质谱仪对气相和粒子相信号强度进行了研究。当相对湿度从0.5 - 20%上升到70-87%时，观察到SOA质量产率增加了7%。在RH升高时，由于颗粒相过程，观察到含氮化合物形成的显着增加。这与SOA粘度的净降低有关，使这些化合物能够在氮氧化物存在的较高RH下更大程度地形成。这些结果强调了颗粒含水量对BB-SOA化合物的分子形成和老化的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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

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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

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.