Variability of submicron aerosol observed at a rural site in Beijing in the summer of 2006
Variability of submicron aerosol observed at a rural site in Beijing in the summer of 2006
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DOI：
10.1029/2008jd010857
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发表时间：
2009-01
影响因子：
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通讯作者：
N. Takegawa;T. Miyakawa;M. Kuwata;Y. Kondo;Yongjing Zhao;S. Han;K. Kita;Y. Miyazaki;Z. Deng-
中科院分区：
文献类型：
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作者：
N. Takegawa;T. Miyakawa;M. Kuwata;Y. Kondo;Yongjing Zhao;S. Han;K. Kita;Y. Miyazaki;Z. Deng-
[1]2006年夏天，作为2006年北京及周边地区空气质量研究运动（CAREBeijing 2006）的一部分，在北京的一个农村地点进行了气溶胶和痕量气体的地面测量。使用Aerodyne四极杆气溶胶质谱仪（AMS）测量了亚微米气溶胶的尺寸分辨化学成分。提供了2006年8月15日至9月10日获得的数据。气象分析表明，测量期间的特点是在几天的过程中低风速周期（停滞期），然后是来自北部/西北部的清洁空气的快速平流，主要是由于中纬度气旋的通过。直径小于1 μm的总测量气溶胶（总PM 1）的质量浓度（定义为AMS测量的元素碳和非耐火成分的总和）变化很大，范围从100 μg m − 2到100 μg m−3。PM 1组成的大变化和硫酸盐（SO 42 −）粒度分布的剧烈变化被观察到与停滞期的循环和清洁空气的平流有关，这表明气溶胶的化学和物理性质在几天的时间尺度上发生了显着变化。结果表明，在PM 1总质量负荷较低时，有机气溶胶占主导地位;在PM 1总质量负荷较高时，SO 42-占主导地位，这对北京市的PM控制策略具有重要意义。讨论了影响SO 42-质量浓度和粒径分布演变的可能因素。
[1] Ground-based measurements of aerosol and trace gases were conducted at a rural site in Beijing in the summer of 2006 as a part of the Campaigns of Air Quality Research in Beijing and Surrounding Region 2006 (CAREBeijing 2006). The size-resolved chemical composition of submicron aerosol was measured using an Aerodyne quadrupole aerosol mass spectrometer (AMS). The data obtained from 15 August to 10 September 2006 are presented. Meteorological analysis shows that the measurement period can be characterized as a cycle of low wind speed periods over the course of a few days (stagnant periods) followed by rapid advection of clean air from the north/northwest mostly due to passage of a midlatitude cyclone. Mass concentrations of total measured aerosol with diameters less than 1 μm (total PM1), which is defined as the sum of elemental carbon and nonrefractory components measured by the AMS, were highly variable, ranging from ∼2 to ∼100 μg m−3. Large variability of the PM1 composition and drastic changes in the sulfate (SO42−) size distribution were observed to be associated with the cycle of stagnant periods and advection of clean air, indicating that both chemical and physical properties of aerosols were significantly altered on a time scale of a few days. We have found the dominance of organic aerosol at lower total PM1 mass loadings and that of SO42− at higher mass loadings, which may have important implications for the PM control strategy in Beijing. Possible factors affecting the evolution of the mass concentration and size distribution of SO42− are discussed.