Long-term study of urban ultrafine particles and other pollutants
Long-term study of urban ultrafine particles and other pollutants
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DOI：
10.1016/j.atmosenv.2010.08.022
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发表时间：
2011-12
影响因子：
5
通讯作者：
Yungang Wang;P. Hopke;David C. Chalupa;M. Utell
中科院分区：
文献类型：
--
作者：
Yungang Wang;P. Hopke;David C. Chalupa;M. Utell
自2001年11月下旬以来，在纽约罗切斯特对超细颗粒（ufp）和其他污染物（PM2.5, SO2， CO和O3）的数量大小分布进行了连续测量。2002-2009年三个粒径范围（10-50 nm、50-100 nm和100-500 nm）的平均颗粒数浓度分别为4730 cm - 3、1838 cm - 3和1073 cm - 3。2008-2009年10-50 nm和50-100 nm的年平均颗粒数浓度最低。10 ~ 50 nm颗粒月平均数量浓度在7月最低，2月最高。10 ~ 50 nm颗粒的日模式在清晨（7 ~ 8 AM）和午后（2 PM）出现两个峰值。从2002-2005年到2008-2009年，高峰数量浓度呈明显下降趋势。观测到2007年至2009年期间与北风有关的二氧化硫浓度大幅下降。清晨粒子成核频率以2005 ~ 2007年减少最为显著。上午成核事件的月变化与10 ~ 50 nm颗粒数浓度密切相关（r = 0.89）。2006年以前与so2相关的局部成核事件发生频率要高得多。这些结果都表明公路交通和工业来源的影响显著。颗粒数量浓度和颗粒成核事件的减少可能是由于2006年10月1日实施的美国环保署2007年重型公路规则，2008年5月关闭大型燃煤发电厂以及伊士曼柯达排放量的减少。
Continuous measurements of number size distributions of ultrafine particles (UFPs) and other pollutants (PM2.5, SO2, CO and O3) have been performed in Rochester, New York since late November 2001. The 2002–2009 average number concentrations of particles in three size ranges (10–50 nm, 50–100 nm and 100–500 nm) were 4730 cm−3, 1838 cm−3, and 1073 cm−3, respectively. The lowest annual average number concentrations of particles in 10–50 nm and 50–100 nm were observed during 2008–2009. The lowest monthly average number concentration of 10–50 nm particles was observed in July and the highest in February. The daily patterns of 10–50 nm particles had two peaks at early morning (7–8 AM) and early afternoon (2 PM). There was a distinct declining trend in the peak number concentrations from 2002–2005 to 2008–2009. Large reductions in SO2concentrations associated with northerly winds between 2007 and 2009 were observed. The most significant annual decrease in the frequency of morning particle nucleation was observed from 2005 to 2007. The monthly variation in the morning nucleation events showed a close correlation with number concentrations of 10–50 nm particles (r = 0.89). The frequency of the local SO2-related nucleation events was much higher before 2006. All of these results suggest significant impacts of highway traffic and industrial sources. The decrease in particle number concentrations and particle nucleation events likely resulted from a combination of the U.S. EPA 2007 Heavy-Duty Highway Rule implemented on October 1, 2006, the closure of a large coal-fired power plant in May 2008, and the reduction of Eastman Kodak emissions.