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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Climatology of new particle formation at Iza?±a mountain GAW observatory in the subtropical North Atlantic
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Climatology of new particle formation at Iza?±a mountain GAW observatory in the subtropical North Atlantic

机译：亚热带北大西洋Iza？±a高山GAW天文台新粒子形成的气候学

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pstrongAbstract./strong A climatology of new particle formation (NPF) events at high altitude in the subtropical North Atlantic is presented. A 4-year data set (June 2008a??June 2012), which includes number size distributions (10a??600 nm), reactive gases (SOsub2/sub, NOsubx/sub, and Osub3/sub), several components of solar radiation and meteorological parameters, measured at Iza?±a Global Atmosphere Watch (GAW) observatory (2373 m above sea level; Tenerife, Canary Islands) was analysed. NPF is associated with the transport of gaseous precursors from the boundary layer by orographic buoyant upward flows that perturb the low free troposphere during daytime. On average, 30% of the days contained an NPF event. Mean values of the formation and growth rates during the study period were 0.46 cmsupa??3/sup ssupa??1/sup and 0.42 nm hsupa??1/sup, correspondingly. There is a clearly marked NPF season (Maya??August), when these events account for 50a??60% of the days per month. Monthly mean values of the formation and growth rates exhibit higher values in this season, 0.49a??0.92 cmsupa??3/sup ssupa??1/sup and 0.48a??0.58 nm hsupa??1/sup, respectively. During NPF events, SOsub2/sub, UV radiation and upslope winds showed higher values than during non-events. The overall data set indicates that SOsub2/sub plays a key role as precursor, although other species seem to contribute during some periods. Condensation of sulfuric acid vapour accounts for most of the measured particle growth during most of the year (~70%), except for some periods. In May, the highest mean growth rates (~0.6 nm hsupa??1/sup) and the lowest contribution of sulfuric acid (~13%) were measured, suggesting a significant involvement of other condensing vapours. The SOsub2/sub availability seems also to be the most influencing parameter in the year-to-year variability in the frequency of NPF events. The condensation sink showed similar features to other mountain sites, showing high values during NPF events. Summertime observations, when Iza?±a is within the Saharan Air Layer, suggest that dust particles may play a significant role acting as coagulation sink of freshly formed nucleation particles. The contribution of dust particles to the condensation sink of sulfuric acid vapours seems to be modest (~8% as average). Finally, we identified a set of NPF events in which two nucleation modes, which may evolve at different rates, occur simultaneously and for which further investigations are necessary./p.
机译：> >摘要。介绍了北亚热带高海拔地区新的颗粒形成（NPF）事件的气候学。为期4年的数据集（2008年6月至2012年6月），其中包括数值大小分布（10a至600 nm），反应性气体（SO 2 ，NO x 和O 3 ），分析了在Iza？±a全球大气监测站（GAW）天文台（海拔2373 m;加那利群岛特内里费岛）测量的太阳辐射和气象参数的几个组成部分。 NPF与通过白天向上扰动低自由对流层的地形浮力向上流动与来自边界层的气态前体的运输有关。平均而言，有30％的日子包含NPF事件。研究期间的形成和生长速率平均值为0.46 cm a ?? 3 s a ?? 1 和0.42 nm h a ?? 1 < / sup>。有一个明显标记的NPF季节（玛雅-8月），这些事件占每月50％-60％的日子。在这个季节，形成和生长速率的月平均值显示出较高的值，分别为0.49a ?? 0.92 cm a ?? 3 s a ?? 1 和0.48a ??。分别为0.58nm h a ?? 1 。在NPF事件期间，SO 2 ，UV辐射和上坡风显示的值高于非事件期间。总体数据表明，SO 2 作为前体起着关键作用，尽管其他物种似乎在某些时期也有贡献。在一年中的大部分时间（约70％）中，除某些时期外，硫酸蒸气的冷凝占了大部分测得的颗粒增长。五月份，测量出最高的平均增长率（〜0.6 nm h a ?? 1 ）和最低的硫酸贡献（〜13％），这表明其他冷凝蒸气也参与其中。 SO 2 的可用性似乎也是NPF事件发生频率逐年变化中影响最大的参数。冷凝水槽显示出与其他山区相似的特征，在NPF事件期间显示出很高的值。夏季的观测结果表明，当Izaα±a在撒哈拉大气层内时，尘埃颗粒可能起着重要作用，起着新形成的成核颗粒的凝结汇的作用。灰尘颗粒对硫酸蒸气冷凝槽的贡献似乎很小（平均约为8％）。最后，我们确定了一组NPF事件，其中两个可能以不同速率演化的成核模式同时发生，并且有待进一步研究。

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