Effects of meteorological processes on aerosol particle size distribution in an urban background area
Effects of meteorological processes on aerosol particle size distribution in an urban background area
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DOI：
10.1029/1999jd901143
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发表时间：
2000-04
影响因子：
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通讯作者：
M. Väkevä;K. Hämeri;T. Puhakka;E. Nilsson;H. Hohti;J. Mäkelä
中科院分区：
文献类型：
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作者：
M. Väkevä;K. Hämeri;T. Puhakka;E. Nilsson;H. Hohti;J. Mäkelä
进行了为期3周的测量活动，以研究当地天气参数、城市地区的交通、边界层结构和降水对芬兰城市背景地区亚微米（流动直径为8-450 nm）气溶胶粒子的影响。此外，监测NOx、O3和SO2的浓度。影响气溶胶粒子的最重要的气象因素是当地风向。边界层的日变化对地面气溶胶粒子的浓度、粒径分布和气相化学起着重要的作用。即使是观察到的少数新粒子的形成似乎也与边界层的变化有关。在这项研究中，没有发现降水（雨或雪）对气溶胶粒径分布可能产生影响的明确迹象。与其他气象过程的影响相比，这种影响明显较小。
A 3 week measurement campaign was undertaken to study the effect of local weather parameters, transportation from an urban area, structure of boundary layer, and precipitation on submicron (8–450 nm in mobility diameter) aerosol particles in urban background area in Finland. Also, the concentrations of NOx, O3, and SO2 were monitored. The most important meteorological factor affecting aerosol particles was shown to be local wind direction. It was also seen that the diurnal behavior of boundary layer plays an important role for aerosol particle concentration and size distribution and gas phase chemistry at the ground level. Even the few occurrences of new particle formation that were observed seem to be connected with changes in the boundary layer. Clear indications of the possible effect of precipitation (rain or snow) on aerosol size distributions could not be detected in this study. The effect is obviously small compared to the influences of other meteorological processes.