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An examination of parameterizations for the CCN number concentration based on in situ measurements of aerosol activation properties in the North China Plain

机译：基于华北平原气溶胶活化特性原位测量的CCN数浓度参数化检查

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Precise quantification of the cloud condensation nuclei (CCN) numberconcentration is crucial for understanding aerosol indirect effects andcharacterizing these effects in models. An evaluation of various methods forCCN parameterization was carried out in this paper based on in situmeasurements of aerosol activation properties within HaChi (Haze in China)project. Comparisons were made by closure studies between methods using CCNspectra, bulk activation ratios, cut-off diameters and size-resolvedactivation ratios. The estimation of CCN number concentrations by the methodusing aerosol size-resolved activation ratios, either averaged over a day orwith diurnal variation, was found to be most satisfying and straightforward.This could be well expected since size-resolved activation ratios includeinformation regarding the effects of size-resolved chemical compositions andmixing states on aerosol activation properties. The method using theaverages of critical diameters, which were inferred from measured CCN numberconcentrations and particle number size distributions, also provided a goodprediction of the CCN number concentration. Based on comparisons of allthese methods in this paper, it was recommended that the CCN numberconcentration be predicted using particle number size distributions withinferred critical diameters or size-resolved activation ratios.
机译：精确量化云凝结核（CCN）的浓度对于理解气溶胶间接效应和表征模型中的这些效应至关重要。本文基于HaChi（中国霾）项目内气溶胶活化特性的现场测量，对各种CCN参数化方法进行了评估。通过使用CCNspectra的方法，本体活化率，截断直径和尺寸分辨活化率之间的封闭研究进行了比较。通过使用一天中的平均气溶胶浓度或昼夜变化来确定气溶胶尺寸激活率的方法，发现CCN数浓度是最令人满意和最直接的方法，这是可以预期的，因为尺寸分辨激活率包括有关影响的信息。尺寸决定的化学成分和混合状态对气溶胶活化性能的影响。根据测得的CCN数浓度和颗粒数尺寸分布推断出的临界直径平均值的方法，也提供了对CCN数浓度的良好预测。基于本文所有这些方法的比较，建议使用推测的临界直径或尺寸分辨的活化率内的粒径分布预测CCN浓度。

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