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本研究对代表长三角区域背景地区的临安大气本底站2006—2007年的SO2和NOx数据进行分析.结果表明,实验期间,SO2和NOx年均浓度均无明显差异;SO2,NOx季节变化特点和一些城市地区的研究结果一致,都是在冬季浓度较高,夏季浓度较低,不同的是,在邻近临安本底站的上海市,SO2与NO2最高月浓度与最低月浓度的比值小于临安区域本底站SO2与NOx最高月浓度与最低月浓度的比值,说明背景地区污染物浓度更容易受到气象条件变化的影响;SO2和NOx小时浓度日变化和城市地区的双峰双谷型分布形态不同,呈现出单谷型分布形态,午后的14点左右,SO2和NOx小时浓度达到24h中的最低值,SO2和NOx分别在凌晨0点左右和晚上20点左右达到24h中的最大值.
In this study, the data of SO2 and NOx from 2006 to 2007 on behalf of the regional background area of the Yangtze River Delta were analyzed. The results show that there is no significant difference in annual average concentrations of SO2 and NOx during the experiment; seasonal variations of SO2 and NOx The results are consistent with those in some urban areas. Both are higher in winter and lower in summer. The difference is that the ratio of the highest and lowest monthly concentrations of SO2 and NO2 in Shanghai near Lin’an backstopping station is less than that of Lin’an The ratio of the maximum monthly concentration of SO2 and NOx to the minimum monthly concentration of regional background stations indicates that the concentration of pollutants in the background area is more likely to be affected by the change of meteorological conditions. The diurnal variation of hourly concentrations of SO2 and NOx and the distribution patterns of double peaks and double troughs in urban areas The distribution of single grain type was present. At about 14 o’clock in the afternoon, the hourly concentration of SO2 and NOx reached the lowest value in 24h, and the maximum value of SO2 and NOx reached 24h in about 0:00 and 20:00 respectively.