【摘要】 根据常州市环境监测中心2013—2015年黑碳气溶胶每1h平均浓度资料,分析常州市黑碳浓度的变化特征以及气象条件对黑碳浓度的影响。结果表明,2013—2015年期间,非降水日和降水日黑碳气溶胶日变化为双峰型结构,峰值出现在当地时7—9时和19—22时,谷值出现在12—16时。降水日受雨水冲刷作用,黑碳气溶胶日变化幅度减小。从年变化看,黑碳气溶胶年平均浓度呈逐年下降的趋势,2013年1月和12月黑碳浓度异常高于其他月份,2014年6—9月黑碳浓度也相对较高,2015年环境空气质量整体改善,黑碳浓度较低。气象条件对黑碳浓度影响显著,非降水日,黑碳浓度与温度和相对湿度呈倒U型关系,降水日黑碳浓度整体上随相对湿度的增加而增加。黑碳浓度随着风速增加而减小,当常州市区主导风向为偏西风时浓度最高。更多还原

【Abstract】 The temporal variations of black carbon(BC)mass concentration in Changzhou are analyzed and discussedby using hourly averaged data monitored continuously at Changzhou Environmental Monitoring Center from 2013 to2015. The results show that there are two obvious peaks during morning 7:00-9:00 and during evening 19:00-22:00,and the trough is during 12:00-16:00 in Local Standard Time(LST)in no-precipitation days. Affected bythe washing action of precipitation,the range of diurnal variation of BC mass concentration is decreased. The annualvariation of BC mass concentration has trended down over the three years. It is abnormal high in January and Decem-ber 2013,and it is also relatively high from June to September in 2014. The BC mass concentration has close rela-tions with meteorological factors such as temperature,relative humidity and wind.In no-precipitation days,the BCmass concentration has an inverted U relationship with temperature and relative humidity. While the BC mass con-centration increases with the increase of relative humidity in precipitation days. It decreases as the wind speed in-creases and it is highest when the prevailing wind is bias W.更多还原