Effects of ammonium sulfate on the hygroscopic properties and phase transition of aerosols with organic surrogates related to biomass burning and atmospheric oxidation

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2025-09-09 DOI:10.1016/j.atmosres.2025.108464

Xin Wang , Yukun Chen , Fang Wang , Yongwei Lu , Zilong Huang , Wei Wang , Yueshe Wang , Jianjun Li

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Abstract

In this study, we investigated the hygroscopic properties of aerosols containing organics related to biomass burning and atmospheric oxidation mixed with (NH₄)₂SO₄ in various proportions during the hydration process using HTDMA. We extrapolated the morphology, phase transition, and potential chemical reactions based on the hygroscopic process of dried particles precipitated from the solution and findings from the literature. The levoglucosan-(NH₄)₂SO₄ mixed particles exhibited deliquescence might be due to an incompletely encapsulated microstructure by levoglucosan, while a continuous growth process with gradual levoglucosan content increase could be attributed to the formation of a core-shell structure. Newly generated substances filled the micropores of succinic acid aerosol after the addition of (NH₄)₂SO₄, but (NH₄)₂SO₄ and succinic acid existed separately after droplet drying when (NH₄)₂SO₄ was dominant. Experimental results of three-component aerosols with adjustable mass ratios reveal that hygroscopic properties and deliquescent relative humidity (DRH) significantly increased with (NH₄)₂SO₄ content. In contrast, the increase in succinic acid reduced particle hygroscopicity at lower RH while having minimal effect on DRH. Furthermore, deliquescence was suppressed by forming a core-shell structure with levoglucosan increase, leading to continuous aerosol diameter increase. Overall, this study provides insights into the effects of (NH₄)₂SO₄ on modulating the hygroscopic properties of typical organic surrogates related to biomass burning and atmospheric oxidation.

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硫酸铵对生物质燃烧和大气氧化相关有机代物气溶胶吸湿性和相变的影响

在这项研究中，我们研究了在HTDMA水化过程中，含不同比例的（NH4）2SO4与生物质燃烧和大气氧化相关有机物的气溶胶的吸湿性能。我们根据从溶液中析出的干燥颗粒的吸湿过程和文献中的发现推断出形貌、相变和潜在的化学反应。左旋葡聚糖-(NH4)2SO4混合颗粒呈现溶解现象可能是由于左旋葡聚糖未完全包封微观结构所致，而左旋葡聚糖含量逐渐增加的连续生长过程可能是由于形成核壳结构所致。添加（NH4）2SO4后，琥珀酸气溶胶的微孔中充满了新生成的物质，但当（NH4）2SO4占主导时，液滴干燥后（NH4）2SO4和琥珀酸分别存在。可调质量比三组分气溶胶的吸湿性能和潮解相对湿度（DRH）随（NH4）2SO4含量的增加而显著提高。相比之下，琥珀酸的增加降低了较低相对湿度下的颗粒吸湿性，而对DRH的影响最小。此外，随着左旋葡聚糖的增加，潮解作用被抑制，形成核壳结构，导致气溶胶直径持续增加。总的来说，本研究提供了（NH4）2SO4对调节与生物质燃烧和大气氧化相关的典型有机替代品吸湿特性的影响。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.