Compositional Evolution of Secondary Organic Aerosol as Temperature and Relative Humidity Cycle in Atmospherically Relevant Ranges
Compositional Evolution of Secondary Organic Aerosol as Temperature and Relative Humidity Cycle in Atmospherically Relevant Ranges
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DOI：
10.1021/acsearthspacechem.9b00232
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发表时间：
2019-10
影响因子：
3.4
通讯作者：
Zixu Zhao;Chen Le;Q. Xu;Weihan Peng;Huanhuan Jiang;Ying-Hsuan Lin;D. Cocker;Haofei Zhang
中科院分区：
文献类型：
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作者：
Zixu Zhao;Chen Le;Q. Xu;Weihan Peng;Huanhuan Jiang;Ying-Hsuan Lin;D. Cocker;Haofei Zhang
大气二次有机气溶胶（SOA）在全球颗粒物收支中发挥着重要作用，其化学成分决定了影响辐射强迫和人类健康的关键特性。在时空运输过程中，大气颗粒经历了环境温度和相对湿度（RH）的变化或循环，从而可能改变其化学成分。在这里，我们报告了烟雾室中α-蒎烯臭氧分解中SOA的组成演变，作为大气相关范围（5-35°C; 10-80% RH）的温度和RH循环。结果表明，与基于挥发性的预测相反，有机蒸汽凝结在冷却过程中受到限制，这可能是由于α-蒎烯SOA颗粒的高粘度和颗粒表面区域半挥发产物的潜在富集。结合一些在线和离线气溶胶体积和分子水平测量，我们确定颗粒相反应发生可逆和不可逆…
Atmospheric secondary organic aerosols (SOA) play an important role in the global particulate matter budget, and their chemical compositions determine critical properties that impact radiative forcing and human health. During temporal and spatial transport, atmospheric particles undergo ambient temperature and relative humidity (RH) changes or cycles that may transform their chemical compositions. Here, we report compositional evolution of SOA from α-pinene ozonolysis in a smog chamber as the temperature and RH cycle within atmospherically relevant ranges (5–35 °C; 10–80% RH). The results suggest that the organic vapor condensation is limited during cooling, in contrast to volatility-based predictions, likely due to high viscosity of the α-pinene SOA particles and the potential enrichment of semivolatile products in the particle surface region. Combining a number of online and offline aerosol bulk and molecular-level measurements, we determine that particle-phase reactions occur reversibly and irreversibl...