【摘要】 利用南京仙林地区连续一年的细颗粒物(PM2.5)和气象观测数据分析了当地PM2.5的变化特征和影响因素。结果表明,南京仙林地区空气中的PM2.5小时平均浓度日变化呈现双峰型态,峰值出现在07:00和19:00~21:00,谷值出现在03:00~05:00以及13:00~14:00;从月均数据来看,2012年10月至2013年1月,南京仙林地区的PM2.5月平均浓度较高,其中1月最高,超过0.120mg/m3,8月在0.038mg/m3左右,为全年最低,从季节尺度来看,冬季PM2.5浓度要明显高于其他3个季节;PM2.5与SO2、NO2相关系数在全年和非降水日统计尺度上差异明显,降水对PM2.5的消除作用明显,但是低浓度状态维持的时间很短;单个气象因子与PM2.5的相关性不明显,气象因子之间存在相互的影响和关联,PM2.5受到各个气象因子共同作用的影响。更多还原

【Abstract】 The variation characteristic of PM2.5 in Nanjing Xianlin area was analyzed by using the long term PM2.5 concentrations and meteorological data for one year.Results showed that the daily variation of PM2.5 presented the bimodal type,two peaks were found at 7:00and 19:00-20:00,and valleys were found at 03:00-05:00and 13:00-14:00respectively.The monthly average PM2.5 concentration in Nanjing Xianlin area was relative high from October 2012to January 2013.The highest PM2.5 concentration was found at January 2013,its monthly average PM2.5 concentration was over 0.120mg/m3,and the lowest monthly average PM2.5 concentrations(0.038mg/m3)appeared in August.From the view of seasonal variation,the PM2.5 concentration in winter was higher than that in other seasons. There was significant difference in the correlation between PM2.5 and SO2,NO2 in time scales with different humidity. Precipitation had an obvious effect on elimination of PM2.5,but the duration of low concentration condition less than 24hours.The effect of single meteorological factor on variation of PM2.5 concentrations was limited.It was the interactions between different meteorological factors that impacted the PM2.5 concentrations in this region.更多还原