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首页> 外文期刊>Atmospheric chemistry and physics >The contribution of sulphuric acid to atmospheric particle formation and growth: a comparison between boundary layers in Northern and Central Europe
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The contribution of sulphuric acid to atmospheric particle formation and growth: a comparison between boundary layers in Northern and Central Europe

机译：硫酸对大气颗粒形成和生长的贡献：北欧和中欧边界层之间的比较

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Atmospheric gaseous sulphuric acid was measured and its influence on particle formation and growth wasinvestigated building on aerosol data. The measurements were part of the EU-project QUEST and took place at twodifferent measurement sites in Northern and Central Europe (Hyytiälä, Finland, March-April 2003 andHeidelberg, Germany, March-April 2004). From a comprehensive data set including sulphuric acid, particle numbersize distributions and meteorological data, particle growth rates, particle formation rates and source rates ofcondensable vapors were inferred. Growth rates were determined in two different ways, from particle sizedistributions as well as from a so-called timeshift analysis. Moreover, correlations between sulphuric acid andparticle number concentration between 3 and 6 nm were examined and the influence of air masses of differentorigin was investigated. Measured maximum concentrations of sulphuric acid were in the range from1x106 to 16x106cm-3. The gaseous sulphuric acid lifetime with respect tocondensation on aerosol particles ranged from 2 to 33min in Hyytiälä and from 0.5 to 8 min inHeidelberg. Most calculated values (growth rates, formation rates, vapor source rates) were considerably higherin Central Europe (Heidelberg), due to the more polluted air and higher preexistent aerosol concentrations.Close correlations between H2SO4 and nucleation mode particles (size range: 3-6 nm) were found onmost days at both sites. The percentage contribution of sulphuric acid to particle growth was below 10% atboth places and to initial growth below 20%. An air mass analysis indicated that at Heidelberg new particleswere formed predominantly in air advected from southwesterly directions.
机译：测量了气态硫酸，并根据气溶胶数据研究了其对颗粒形成和生长的影响。这些测量是欧盟项目QUEST的一部分，在北欧和中欧的两个不同测量点（2003年3月至4月在芬兰的海蒂亚拉和2004年3月至4月在德国海德堡进行）进行了测量。从包括硫酸，颗粒数分布和气象数据在内的综合数据集，推断出颗粒生长速率，颗粒形成速率和可冷凝蒸气的源速率。通过两种不同的方法来确定生长速率，这两种方法是通过粒度分布以及所谓的时移分析确定的。此外，研究了硫酸与3和6 nm之间的颗粒数浓度之间的相关性，并研究了不同产地的空气质量的影响。测得的硫酸最高浓度范围为1x10 6 至16x10 6 cm -3 。在Hyytiälä，气态硫酸盐在气溶胶颗粒上的凝结寿命为2至33分钟，在海德堡为0.5至8分钟。 H 2 SO 2 SO 4 和成核模式颗粒（尺寸范围：3-6 nm）。硫酸对颗粒生长的百分比贡献在两个位置均低于10％，对初始生长的贡献低于20％。空气质量分析表明，在海德堡，新颗粒主要形成在从西南方向对流的空气中。

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