Variability of the aerosol number size distribution in Beijing, China: New particle formation, dust storms, and high continental background
Variability of the aerosol number size distribution in Beijing, China: New particle formation, dust storms, and high continental background
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DOI：
10.1029/2004gl021596
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发表时间：
2004-11
影响因子：
5.2
通讯作者：
B. Wehner;A. Wiedensohler;T. Tuch;Zhijun Wu;M. Hu;J. Slanina;C. S. Kiang
中科院分区：
文献类型：
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作者：
B. Wehner;A. Wiedensohler;T. Tuch;Zhijun Wu;M. Hu;J. Slanina;C. S. Kiang
自2004年3月以来，首次在北京城区范围内对3 nm ~ 10 μm的气溶胶粒子数谱分布进行了连续测量。前45个测量日（2004年3月5日至4月18日）的大小分布进行了调查，在他们的高变异性。观测到两次沙尘暴事件，其数值浓度大于1 μm，质量浓度约为1 mg m−3。在12天内观察到大陆高度污染的空气，在累积模式范围内出现数峰，并观察到超过150 μm3 cm−3的亚微米体积浓度。当颗粒表面积浓度低于临界值（100-2000 μm2 cm−3）时，由于来自北方的清洁空气，在25天内观察到超过100，000 cm−3的新形成颗粒。测量结果显示，颗粒物只有轻微的增长（约1 nm h−1），表明它们是在北京市区内产生的。
Continuous measurements of aerosol number size distributions from 3 nm to 10 μm have been first performed within the city area of Beijing since March 2004. Size distributions of the first 45 measurement days (March 05 to April 18, 2004) were investigated in terms of their high variability. Two dust storm events were observed indicated by high number concentrations greater than 1 μm and mass concentrations around 1 mg m−3. Continental highly polluted air was observed during 12 days indicated by a number peak in the accumulation mode range, and submicrometer volume concentrations above 150 μm3 cm−3 were observed. Newly formed particles with more than 100,000 cm−3 were observed on 25 days when the particle surface area concentration drops below a critical value (100–2000 μm2 cm−3) because of clean air from the north. Measurements show only a slight growth (∼1 nm h−1) of the particles indicating that they are produced within the city area of Beijing.