沿海城市气溶胶 pH 值影响因素及其对 PM2.5 和 O3 污染响应的定量分析

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Ke Xu , Liqian Yin , Qiaoling Chen , Dan Liao , Xiaoting Ji , Keran Zhang , Yu Wu , Lingling Xu , Mengren Li , Xiaolong Fan , Fuwang Zhang , Zhi Huang , Jinsheng Chen , Youwei Hong
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引用次数: 0

摘要

气溶胶酸度(pH)在大气颗粒物的多相化学过程中发挥着重要作用。本研究利用 ISORROPIA-II 模式计算了中国东南沿海城市气溶胶 pH 值的季节变化趋势。我们对气溶胶 pH 值的各种影响因素进行了定量分析,并探讨了气溶胶 pH 值对不同 PM2.5 和 O3 污染水平的响应。结果表明,气溶胶 pH 平均值为 2.92 ± 0.61,依次为冬季、春季、夏季、秋季。灵敏度测试显示,SO42-、NHx、T 和 RH 引发了气溶胶 pH 值的变化。定量分析结果表明,T(37.9%-51.2%)是影响四季 pH 值变化的主要因素,其次是 SO42-(6.1%-23.7%)、NHx(7.2%-22.2%)和 RH(0-14.2%)。总之,年平均气象因子(52.9%)和化学成分(41.3%)是造成沿海城市气溶胶 ΔpH 的主要因素。PM2.5 浓度与气溶胶液态水含量(R2 = 0.53)和气溶胶 pH 值(R2 = 0.26)呈正相关,表明 pH 值的升高与 NH4NO3 的升高、SO42- 的降低以及气温和相对湿度的变化有关。Ox(O3 + NO2)与气溶胶 pH 呈中度相关(R2 = -0.48),这是因为在高温度和低相对湿度条件下,SO42- 的比例增加了。该研究加深了我们对影响因素对气溶胶 pH 值的贡献的理解,也为沿海地区大气颗粒物的化学过程提供了科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Quantitative analysis of influencing factors to aerosol pH and its responses to PM2.5 and O3 pollution in a coastal city

Quantitative analysis of influencing factors to aerosol pH and its responses to PM2.5 and O3 pollution in a coastal city

Aerosol acidity (pH) plays an important role in the multiphase chemical processes of atmospheric particles. In this study, we demonstrated the seasonal trends of aerosol pH calculated with the ISORROPIA-II model in a coastal city of southeast China. We performed quantitative analysis on the various influencing factors on aerosol pH, and explored the responses of aerosol pH to different PM2.5 and O3 pollution levels. The results showed that the average aerosol pH was 2.92 ± 0.61, following the order of winter > spring > summer > autumn. Sensitivity tests revealed that SO42−, NHx, T and RH triggered the variations of aerosol pH. Quantitative analysis results showed that T (37.9%-51.2%) was the main factors affecting pH variations in four seasons, followed by SO42− (6.1%-23.7%), NHx (7.2%-22.2%) and RH (0–14.2%). Totally, annual mean meteorological factors (52.9%) and chemical compositions (41.3%) commonly contributed the aerosol ΔpH in the coastal city. The concentrations of PM2.5 was positively correlated with aerosol liquid water content (R2 = 0.53) and aerosol pH (R2 = 0.26), indicating that the increase in pH was related with the elevated NH4NO3 and decreased SO42−, and also the changes of T and RH. The Ox (O3 + NO2) was moderately correlated with aerosol pH (R2 = -0.48), attributable to the fact that the proportion of SO42− increased under high T and low RH conditions. The study strengthened our understanding of the contributions of influencing factors to aerosol pH, and also provided scientific evidences for chemical processes of atmospheric particles in coastal areas.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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