Characterization of size-resolved aerosol hygroscopicity and liquid water content in Nanjing of the Yangtze River Delta

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-03-28 DOI:10.1016/j.jes.2024.03.035
Youling Jiang , Yan Ma , Jun Zheng , Nan Ye , Cheng Yuan
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Abstract

Aerosol hygroscopicity and liquid water content (ALWC) have important influences on the environmental and climate effect of aerosols. In this study, we measured the hygroscopic growth factors (GF) of particles with dry diameters of 40, 80, 150, and 200 nm during the wintertime in Nanjing. Both the GF-derived hygroscopicity parameter (κgf) and ALWC increased with particle size, but displayed differing diurnal variations, with κgf peaking around the midday, while ALWC peaking in the early morning. Nitrate, ammonium and oxygenated organic aerosols (OOA) were found as the chemical components mostly strongly correlated with ALWC. A closure study suggests that during midday photo-oxidation and nighttime high ALWC periods, the κ of organic aerosols (κorg) was underestimated when using previous parameterizations. Accordingly, we re-constructed parameterizations for κorg and the oxidation level of organics for these periods, which indicates a higher hygroscopicity of photochemically formed OOA than the aqueous OOA, yet both being much higher than the generally assumed OOA hygroscopicity. Additionally, in a typical high ALWC episode, concurrently increased ALWC, nitrate, OOA as well as aerosol surface area and mass concentrations were observed under elevated ambient RH. This strongly indicates a coupled effect that the hygroscopic secondary aerosols, in particular nitrate with strong hygroscopicity, led to large increase in ALWC, which in turn synergistically boosted nitrate and OOA formation by heterogeneous/aqueous reactions. Such interaction may represent an important mechanism contributing to enhanced formation of secondary aerosols and rapid growth of fine particulate matter under relatively high RH conditions.

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长江三角洲南京地区气溶胶吸湿性和液态水含量的粒度分辨特征
气溶胶的吸湿性和液态水含量(ALWC)对气溶胶的环境和气候效应有重要影响。本研究测量了南京冬季干直径为 40、80、150 和 200 nm 的颗粒物的吸湿性增长因子(GF)。GF衍生的吸湿性参数(κgf)和ALWC均随颗粒大小的增加而增加,但表现出不同的昼夜变化,κgf在正午前后达到峰值,而ALWC在清晨达到峰值。硝酸盐、铵和含氧有机气溶胶(OOA)是与 ALWC 关系最密切的化学成分。一项闭合研究表明,在正午光氧化期和夜间高 ALWC 期,使用以前的参数时低估了有机气溶胶的 κ (κorg)。因此,我们重新构建了这些时段的κorg 和有机物氧化水平参数,结果表明光化学形成的 OOA 吸湿性高于水溶液 OOA,但两者都远高于一般假设的 OOA 吸湿性。此外,在典型的高 ALWC 事件中,观察到在环境相对湿度升高的情况下,ALWC、硝酸盐、OOA 以及气溶胶表面积和质量浓度同时增加。这有力地表明了一种耦合效应,即吸湿性二次气溶胶(尤其是吸湿性很强的硝酸盐)导致 ALWC 大量增加,而 ALWC 又通过异构/水反应协同促进了硝酸盐和 OOA 的形成。在相对高相对湿度条件下,这种相互作用可能是促进二次气溶胶形成和细颗粒物快速增长的重要机制。
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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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