Measurements of the sensitivity of aerosol hygroscopicity and the κ parameter to the O/C ratio.
Measurements of the sensitivity of aerosol hygroscopicity and the κ parameter to the O/C ratio.
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DOI：
10.1021/jp407991n
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
A. Rickards;R. E. H. Miles;J. F. Davies;Frances H. Marshall;J. Reid
中科院分区：
文献类型：
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作者：
A. Rickards;R. E. H. Miles;J. F. Davies;Frances H. Marshall;J. Reid
我们报告的气溶胶粒子的亚饱和吸湿增长的测量组成的单一有机成分的不同的氧碳比接近饱和的相对湿度使用气溶胶光镊和电动平衡的技术。发现甚至相同0/C比的化合物之间的吸湿性参数κ的变化是显著的，例如，对于0/C为1的化合物，κ值的范围为0.12至0.38。的测量结果进行了比较，所有可用的文献数据，其中的κ值和O/C比的报告，并确定了一个新的参数化。临界过饱和预测使用此参数化产量值，具有相关的不确定性，可与临界过饱和的实验测量中的典型不确定性相媲美。然而，从不同的研究中确定的κ参数化之间的系统变异性仍然很大，与O/C比一致，仅提供了气溶胶吸湿性的近似指南，并反映了不同化学功能，组成和氧化历史的气溶胶的显着变化。
We report measurements of the subsaturated hygroscopic growth of aerosol particles composed of single organic components of varying oxygen-to-carbon ratio up to relative humidities approaching saturation using the techniques of aerosol optical tweezers and an electrodynamic balance. The variation in the hygroscopicity parameter κ between compounds of even the same O/C ratio is found to be significant with, for example, a range in κ values from 0.12 to 0.38 for compounds with an O/C of 1. The measurements are compared with a review of all of the available literature data for which both the κ value and O/C ratio are reported, and a new parametrization is determined. Critical supersaturations predicted using this parametrization yield values that have associated uncertainties that are comparable to typical uncertainties in experimental measurements of critical supersaturations. However, the systematic variability between κ parametrizations determined from different studies remains large, consistent with the O/C ratio providing only an approximate guide to aerosol hygroscopicity and reflecting significant variations for aerosols of different chemical functionality, composition, and oxidation history.