Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC
Analysis of atmospheric neutral and charged molecular clusters in boreal forest using pulse-height CPC
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DOI：
10.5194/acp-9-4177-2009
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发表时间：
2008-12
影响因子：
6.3
通讯作者：
K. Lehtipalo;M. Sipilä;I. Riipinen;T. Nieminen;M. Kulmala
中科院分区：
文献类型：
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作者：
K. Lehtipalo;M. Sipilä;I. Riipinen;T. Nieminen;M. Kulmala
抽象的。2007年春季至2008年5月，我们在芬兰南部Hyytiala的Smear II站应用脉冲高度CPC技术测量了大气中性星团和带电星团以及迁移率直径约为1.5 nm的粒子的尺寸分布。在北方森林环境中，小于3 nm的分子团簇的浓度似乎变化很大，通常在500-5万cm−3之间变化。通过与离子光谱仪测量的浓度进行比较，我们得出结论：离子-离子复合产生的离子团簇和中性团簇通常不足以解释所有观察到的团簇，所有中性团簇的复合产物的中位数为4.9%。在大多数新粒子形成事件之前和期间，团簇形成率仅略有上升，或保持接近稳定。夜间也经常观察到星团的形成。
Abstract. We measured the size distribution of atmospheric neutral and charged clusters and particles down to mobility diameter around 1.5 nm by applying pulse-height CPC technique at SMEAR II station in Hyytiala, southern Finland during spring 2007 and May 2008. The concentration of molecular clusters smaller than 3 nm seems to be highly variable in boreal forest environment, the concentration varied typically between 500–50 000 cm−3. By comparing to concentrations measured with ion spectrometers, we conclude that ion clusters and neutral clusters produced by ion-ion recombination are usually not sufficient to explain all of the observed clusters; the median fraction of recombination products from all neutral clusters was 4.9%. Before and during most new particle formation events the cluster formation rate rose only slightly, or remained close to stable. Nocturnal formation of clusters was also frequently observed.