Adsorptive uptake of water by semisolid secondary organic aerosols
Adsorptive uptake of water by semisolid secondary organic aerosols
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DOI：
10.1002/2015gl063142
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发表时间：
2015-04-28
影响因子：
5.2
通讯作者：
Virtanen, Annele
中科院分区：
文献类型：
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作者：
Pajunoja, Aki;Lambe, Andrew T.;Virtanen, Annele
气溶胶的气候效应与其与水的相互作用密切相关。在这里，我们结合联合收割机吸湿性测量与直接观察相的二次有机气溶胶（SOA）颗粒，表明水的吸收轻微含氧SOA是一个吸附为主的过程在亚饱和条件下，低溶解度抑制吸水，直到湿度足够高的溶解发生。这与先前吸湿性密封件研究中报告的差异一致。我们证明，SOA吸湿行为在亚饱和和过饱和条件下的差异可能导致高达约30%的影响，在直接气溶胶forcingighlighting需要实施正确的描述，这些过程中的大气模型。因此，在水饱和点上获得闭合是精确气候建模的关键问题。
Aerosol climate effects are intimately tied to interactions with water. Here we combine hygroscopicity measurements with direct observations about the phase of secondary organic aerosol (SOA) particles to show that water uptake by slightly oxygenated SOA is an adsorption-dominated process under subsaturated conditions, where low solubility inhibits water uptake until the humidity is high enough for dissolution to occur. This reconciles reported discrepancies in previous hygroscopicity closure studies. We demonstrate that the difference in SOA hygroscopic behavior in subsaturated and supersaturated conditions can lead to an effect up to about 30% in the direct aerosol forcinghighlighting the need to implement correct descriptions of these processes in atmospheric models. Obtaining closure across the water saturation point is therefore a critical issue for accurate climate modeling.