A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network-猫眼课题宝

DOI：

10.5194/acp-15-12211-2015

发表时间：

2015-11

期刊：

Atmospheric Chemistry and Physics

影响因子：

6.3

通讯作者：

中科院分区：

地球科学1区

文献类型：

作者：

M. Paramonov;V. Kerminen;M. Gysel;P. Aalto;M. Andreae;E. Asmi;U. Baltensperger;A. Bougiatioti;D. Brus;G. Frank;N. Good;S. S. Gunthe-S.;L. Hao;M. Irwin;A. Jaatinen;Z. Jurányi;S. King;A. Kortelainen;A. Kristensson;H. Lihavainen;M. Kulmala;U. Lohmann;S. Martin;G. Mcfiggans;N. Mihalopoulos;A. Nenes;C. O’Dowd;J. Ovadnevaitė;T. Petäjä;U. Pöschl;G. Roberts;D. Rose;B. Svenningsson;E. Swietlicki;E. Weingartner;J. Whitehead;A. Wiedensohler;C. Wittbom;B. Sierau

抽象的。在欧洲气溶胶-云-气候-空气质量相互作用综合项目（EUCAARI）框架内，对全球14个地点的云凝结核计数器（CCNC）测量结果进行了分析和讨论，讨论了大气气溶胶的云凝结核（CCN）激活和吸湿特性。激活云凝结核（NCCN）与粒子总数浓度（NCN）的年平均比率（称为激活分数A）在许多地点显示出对过饱和度S的类似函数依赖性-但某些海洋地点、自由对流层地点除外。德国西南部和芬兰北方的背景地点。当计算活化分数（分别为A50和A100）时，使用直径大于50和100 nm的颗粒的总数浓度使得A对S的依赖性更加稳定; A50和A100还揭示了粒度分布对CCN活化的影响。关于化学成分，发现气溶胶颗粒的吸湿性作为大小的函数在不同地点之间存在差异。在德国西南部的一个大陆站点，吸湿性参数κ随着尺寸的增加而降低，在遥远的热带北大西洋和匈牙利中部农村地区，在观测到的尺寸范围内波动，没有任何特定的尺寸依赖性。在所有其他位置，κ随尺寸增大而增大。事实上，在Hyytiala、Vavihill、Jungfraujoch和Pallas，Aitken和累积模式气溶胶之间的吸湿性差异在5%的显著性水平上具有统计学显著性。在北半球环境中，假设κ与尺寸无关，可能会导致在S水平高于0.6%时对NCCN的潜在实质性高估。对于其他位置也是如此，其中发现κ随尺寸增加。虽然有关气溶胶吸湿性的详细信息可以显着改善NCCN的预测，总气溶胶数浓度和气溶胶粒径分布仍然是更重要的参数。CCN激活和吸湿特性的季节和昼夜模式在三个长期位置之间存在差异，突出了各种环境中潜在气溶胶-云相互作用的空间和时间变化。

Abstract. Cloud condensation nuclei counter (CCNC) measurements performed at 14 locations around the world within the European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) framework have been analysed and discussed with respect to the cloud condensation nuclei (CCN) activation and hygroscopic properties of the atmospheric aerosol. The annual mean ratio of activated cloud condensation nuclei (NCCN) to the total number concentration of particles (NCN), known as the activated fraction A, shows a similar functional dependence on supersaturation S at many locations – exceptions to this being certain marine locations, a free troposphere site and background sites in south-west Germany and northern Finland. The use of total number concentration of particles above 50 and 100 nm diameter when calculating the activated fractions (A50 and A100, respectively) renders a much more stable dependence of A on S; A50 and A100 also reveal the effect of the size distribution on CCN activation. With respect to chemical composition, it was found that the hygroscopicity of aerosol particles as a function of size differs among locations. The hygroscopicity parameter κ decreased with an increasing size at a continental site in south-west Germany and fluctuated without any particular size dependence across the observed size range in the remote tropical North Atlantic and rural central Hungary. At all other locations κ increased with size. In fact, in Hyytiala, Vavihill, Jungfraujoch and Pallas the difference in hygroscopicity between Aitken and accumulation mode aerosol was statistically significant at the 5 % significance level. In a boreal environment the assumption of a size-independent κ can lead to a potentially substantial overestimation of NCCN at S levels above 0.6 %. The same is true for other locations where κ was found to increase with size. While detailed information about aerosol hygroscopicity can significantly improve the prediction of NCCN, total aerosol number concentration and aerosol size distribution remain more important parameters. The seasonal and diurnal patterns of CCN activation and hygroscopic properties vary among three long-term locations, highlighting the spatial and temporal variability of potential aerosol–cloud interactions in various environments.

A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network

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