Lin Hai-Feng, Xin Jin-Yuan, Zhang Wen-Yu, Wang Yue-Si, Liu Zi-Rui, Chen Chuan-Lei
Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, College of Atmospheric Science, Lanzhou University, Lanzhou 730000, China.
Huan Jing Ke Xue. 2013 Mar;34(3):826-34.
The pollution of particulate matter was serious in Beijing City from the synchronous observation of particulate matter mass concentration and aerosol optical characteristics in 2009. The annual mean concentrations of PM2.5 and PM10 were (65 +/- 14) microg x m(-3) and (117 +/- 31) microg x m(-3), respectively, which exceeded the national ambient air quality annual standards to be implemented in 2016. There were 35% and 26% days of 2009 that the daily standards were exceeded. There was a significant correlation between fine particulate (PM2.5) and inhalable particle (PM10), with a correlation coefficient (R) of approximately 0.90 (P < 0.001). PM10 contained a large percentage of PM2.5, with an annual percentage of about 61%. The percentage became much higher from spring to winter, while the correlation between PM2.5 and PM10 became much stronger. The annual mean of AOD (500 nm) and Angstrom exponent were (0.55 +/- 0.1) and (1.12 +/- 0.08), respectively. There were significant correlations between PM2.5, PM10 and AOD in the four seasons and the whole year, and the correlation coefficients were greater than or equal to 0.50. Furthermore, the correlation functions and coefficients had seasonal variations. The correlations were more significant in summer and autumn than in spring and winter. The annual correlation could cover up the seasonal systematic differences. The correlations between AOD revised by Mixed Layer Height and PM2.5 PM10 revised by Relative Humidity became stronger, and the exponential correlations were superior to the linear correlations.
根据2009年对颗粒物质量浓度和气溶胶光学特性的同步观测，北京市颗粒物污染严重。PM2.5和PM10的年均浓度分别为(65±14)μg·m(-3)和(117±31)μg·m(-3)，超过了2016年即将实施的国家环境空气质量年度标准。2009年分别有35%和26%的天数超标。细颗粒物(PM2.5)与可吸入颗粒物(PM10)之间存在显著相关性，相关系数(R)约为0.90(P<0.001)。PM10中PM2.5所占比例较大，年比例约为61%。从春季到冬季，该比例变得更高，而PM2.5与PM10之间的相关性也变得更强。AOD(500nm)和埃指数的年均值分别为(0.55±0.1)和(1.12±0.08)。PM2.5、PM10与AOD在四季及全年均存在显著相关性，相关系数均大于或等于0.50。此外，相关函数和系数存在季节变化。夏季和秋季的相关性比春季和冬季更显著。年度相关性可能掩盖了季节系统性差异。经混合层高度修正的AOD与经相对湿度修正的PM2.5、PM10之间的相关性增强，指数相关性优于线性相关性。
