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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >An examination of parameterizations for the CCN number concentration based on in situ measurements of aerosol activation properties in the North China Plain
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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的原位测量，对CCN数浓度进行参数化检查

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pstrongAbstract./strong Precise quantification of the cloud condensation nuclei (CCN) number concentration is crucial for understanding aerosol indirect effects and characterizing these effects in models. An evaluation of various methods for CCN parameterization was carried out in this paper based on in situ measurements of aerosol activation properties within HaChi (Haze in China) project. Comparisons were made by closure studies between methods using CCN spectra, bulk activation ratios, cut-off diameters and size-resolved activation ratios. The estimation of CCN number concentrations by the method using aerosol size-resolved activation ratios, either averaged over a day or with diurnal variation, was found to be most satisfying and straightforward. This could be well expected since size-resolved activation ratios include information regarding the effects of size-resolved chemical compositions and mixing states on aerosol activation properties. The method using the averages of critical diameters, which were inferred from measured CCN number concentrations and particle number size distributions, also provided a good prediction of the CCN number concentration. Based on comparisons of all these methods in this paper, it was recommended that the CCN number concentration be predicted using particle number size distributions with inferred critical diameters or size-resolved activation ratios./p.
机译：> >摘要。对云凝结核（CCN）数量浓度的精确定量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。通过封闭研究对使用CCN光谱，本体活化率，截止直径和尺寸分辨活化率的方法进行了比较。发现通过使用气溶胶尺寸分辨的活化比的方法对CCN数浓度进行估计是最令人满意和最直接的，该比率是一天中的平均值或日变化。由于尺寸分辨活化率包括关于尺寸分辨化学组成和混合状态对气溶胶活化性能的影响的信息，因此这是可以预料的。由测得的CCN数浓度和颗粒数大小分布推断出的使用临界直径平均值的方法，也提供了对CCN数浓度的良好预测。在对所有这些方法进行比较的基础上，建议使用具有推测的临界直径或尺寸分辨的活化比的粒径分布来预测CCN浓度。

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