Formation and growth of fresh atmospheric aerosols: eight years of aerosol size distribution data from SMEAR II, Hyytiälä, Finland
Formation and growth of fresh atmospheric aerosols: eight years of aerosol size distribution data from SMEAR II, Hyytiälä, Finland
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发表时间：
2005
影响因子：
1.2
通讯作者：
M. D. Maso;M. Kulmala;I. Riipinen;R. Wagner;T. Hussein;P. Aalto;K. Lehtinen
中科院分区：
文献类型：
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作者：
M. D. Maso;M. Kulmala;I. Riipinen;R. Wagner;T. Hussein;P. Aalto;K. Lehtinen
我们分析了 1996 年至 2003 年间在芬兰海蒂拉的北方森林测量点连续测量的粒径分布。根据八年的数据，我们确定了新气溶胶颗粒形成的日子以及未检测到形成的日子，从而消除了状态不明确的日子。然后根据是否可以确定新颗粒的形成和生长速率对事件日进行分类。然后计算这些特性。我们发现新颗粒的形成频繁发生在北方森林边界层，至少有 24% 的天发生这一事件。春季和秋季发生事件的可能性高于一年中的其他时间。大于3 nm颗粒物的平均形成速率为0.8 cm -3 s -1 ，春季和秋季速率增强。平均生长速率为3.0 nm h -1 ，在夏季达到峰值。创建的事件数据库对于未来研究导致大气中新颗粒形成的原因很有价值。
We analyzed size distributions measured continuously at a boreal forest measurement site at Hyytiala, Finland between 1996 and 2003. From the eight-year data we identified days when new aerosol particle formation was taking place as well as days when no formation was detected, removing days with ambiguous status. The event days were then classified based on whether it was possible to determine formation and growth rates of new particles. These characteristics were then calculated. We found that new particle formation happens frequently in the boreal forest boundary layer, with at least 24% of days containing an event. Events are more probable during spring and autumn than during other times of the year. The average formation rate of particles larger than 3 nm was 0.8 cm -3 s -1 , with enhanced rates during spring and autumn. The mean growth rate was 3.0 nm h -1 , peaking in summer. The created event database is valuable for future studies of reasons leading to new particle formation in the atmosphere.