Secondary Organic Aerosol Formation Regulates Cloud Condensation Nuclei in the Global Remote Troposphere
Secondary Organic Aerosol Formation Regulates Cloud Condensation Nuclei in the Global Remote Troposphere
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DOI：
10.1029/2022gl100543
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发表时间：
2022-09
影响因子：
5.2
通讯作者：
Mingxu Liu;H. Matsui
中科院分区：
文献类型：
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作者：
Mingxu Liu;H. Matsui
通过有机蒸汽的大气氧化形成二次有机气溶胶（SOA）有可能使颗粒增长到云凝结核（CCN）相关的尺寸。在这项工作中，我们通过使用飞机测量来约束全球气溶胶模型，以揭示SOA形成在CCN生产中的全球重要性。我们改进的模型，明确的尺寸分辨气溶胶微物理和半挥发性有机氧化产物的参数化，在模拟远程大气中由SOA主导的颗粒数浓度和有机气溶胶浓度（80-95%）方面表现出最先进的性能，这在以前的建模研究中一直是一个挑战。SOA的形成与气溶胶成核相一致，在那些具有低背景气溶胶浓度的原始环境中贡献了超过50%的CCN浓度。我们估计SOA导出的CCN使云辐射强迫的大小改变了10.1 W m−2。我们的研究结果强调了气溶胶气候模型通过SOA生产来代表对CCN浓度的控制的必要性。
Formation of secondary organic aerosols (SOA) through the atmospheric oxidation of organic vapors has potential to enable particle growth to cloud condensation nuclei (CCN)‐relevant sizes. In this work, we constrain a global aerosol model by using aircraft measurements to reveal the global importance of SOA formation in CCN production. Our improved model, with explicit size‐resolved aerosol microphysics and parametrizations of semivolatile organic oxidation products, presents a state‐of‐the‐art performance in simulating both particle number concentrations and organic aerosol concentrations dominated (80–95%) by SOA in the remote atmosphere, which have been challenges in previous modeling studies. The SOA formation in concert with aerosol nucleation contributes to more than 50% of CCN concentrations in those pristine environments featuring low background aerosol concentrations. We estimate that the SOA‐derived CCN alters the magnitude of cloud radiative forcing by ∼0.1 W m−2. Our findings underscore the necessity for aerosol‐climate models to represent controls on CCN concentrations by SOA production.