One-year observation of the mixing states of oxygenated organics-containing single particles in Guangzhou, China

IF 6.1 2区环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL Frontiers of Environmental Science & Engineering Pub Date : 2024-03-11 DOI:10.1007/s11783-024-1824-3

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Abstract

Oxygenated organic molecules (OOMs) play an important role in the formation of secondary organic aerosols (SOAs), but the mixing states of OOMs are still unclear. This study investigates the mixing states of OOM-containing single particles from the measurements taken using a single particle aerosol mass spectrometer in Guangzhou, China in 2022. Generally, the particle counts of OOM particles and the mass concentration of secondary organic carbon (SOC) exhibited similar temporal trends throughout the entire year. The OOM particles were consistently enriched in secondary ions, including ¹⁶O⁻, ²⁶CN⁻, ⁴⁶NO₂⁻, ⁶²NO₃⁻, and ⁹⁷HSO₄⁻. In contrast, the number fractions and diurnal patterns of OOM particles among the total detected particles showed similar distributions in August and October; however, the SOC ratios in fine particulate matter were quite different, suggesting that there were different mixing states of single-particle oxygenated organics. In addition, further classification results indicated that the OOM particles were more aged in October than August, even though the SOC ratios were higher in August. Furthermore, the distribution of hydrocarbon fragments exhibited a notable decrease from January to October, emphasizing the more aged state of the organics in October. In addition, the sharp increase in elemental carbon (EC)-OOM particles in the afternoon in October suggests the potential role of EC in the aging process of organics. Overall, in contrast to the bulk analysis of SOC mass concentration, the mixing states of the OOM particles provide insights into the formation process of SOAs in field studies.

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对中国广州含氧有机物单颗粒物混合状态的一年观测

摘要含氧有机分子（OOMs）在二次有机气溶胶（SOAs）的形成过程中发挥着重要作用，但其混合状态尚不清楚。本研究通过 2022 年在中国广州使用单颗粒气溶胶质谱仪进行的测量，研究了含 OOM 的单颗粒的混合状态。总体而言，OOM 颗粒的粒子数和二次有机碳（SOC）的质量浓度在全年呈现出相似的时间趋势。OOM 颗粒中始终富含二次离子，包括 16O-、26CN-、46NO2-、62NO3- 和 97HSO4-。相比之下，在 8 月和 10 月，OOM 颗粒在检测到的总颗粒物中的数量分数和昼夜变化规律显示出相似的分布；但是，细颗粒物中的 SOC 比率却大不相同，这表明单颗粒含氧有机物存在不同的混合状态。此外，进一步的分类结果表明，尽管 8 月份的 SOC 比率较高，但 10 月份的含氧有机物颗粒比 8 月份更老化。此外，碳氢化合物碎片的分布从 1 月到 10 月出现了明显的减少，这突出表明 10 月份的有机物更加老化。此外，10 月份下午的元素碳（EC）-OOM 颗粒急剧增加，表明元素碳可能在有机物的老化过程中发挥了作用。总之，与有机碳质量浓度的总体分析相比，OOM 颗粒的混合状态有助于了解实地研究中 SOAs 的形成过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES

CiteScore

10.90

自引率

12.50%

发文量

988

审稿时长

6.1 months

期刊介绍： Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.