兰州城市和远郊区黑碳气溶胶浓度特征

利用兰州大学半干旱气候与环境观测站(SACOL)2010年9月至2011年8月的黑碳气溶胶观测资料,分析了兰州市区和郊区黑碳气溶胶的浓度变化特征.结果表明:市区的年平均黑碳浓度要远大于郊区.日变化都呈明显的双峰结构,最大值出现在08:00~10:00,最小值出现在16:00左右;对于月最大频数浓度的年变化,市区和郊区均是5月黑碳浓度最小,其值分别为1143和932ng/m3,1月黑碳浓度最大,分别为10230和5063ng/m3;市区的周变化较郊区明显;沙尘条件下黑碳气溶胶浓度值低于当月的日均值.

Property of black carbon concentration over urban and suburban of Lanzhou

The variation of black carbon (BC) concentration over urban and suburban areas of Lanzhou were analyzed using the BC observation data from the Semi-arid Climate and Environment Observatory of Lanzhou University (SACOL) from September 2010to August 2011. The results showed that the average BC concentration in urban area was much higher than that in suburban area. The diurnal variation showed a bimodal distribution with the maximum value at 08:00~10:00(Beijing Time), and the minimum around 16:00; the annual variations of monthly maximum frequency BC concentration in urban and suburban areas were similar, the minimums of BC were shown in May with the values of 1143and 932ng/m3 respectively, and the maximums were in January with their values of 10230 and 5063ng/m3 respectively; the weekly variation was more obviously in urban area than that in suburban area; BC concentration under the condition of dust event was lower than the daily average concentration in the same month.