中文摘要：

为研究杭州市PM2.5中碳组分特征,于2013年12月-2014年2月在7个常规点位和2个对照点同步采集PM2.5样品,分析其污染特征及来源.结果表明：杭州市冬季有机碳（OC）、元素碳（EC）、二次有机碳（SOC）的平均质量浓度分别为（23.7±7.5）（5.0±2.4）和（9.2±4.5）μg/m^3,OC/EC[ρ（OC）/ρ（EC）]和SOC/OC[ρ（SOC）/ρ（OC）]的平均值分别为5.3±1.9和0.4±0.2.对照点ρ（OC）、ρ（EC）、ρ（SOC）和OC/EC、SOC/OC分别为常规点位的0.8、0.6、1.2、1.2和1.3倍.采样期间,常规点位和对照点ρ（OC）和ρ（EC）的日均值具有相同的时间变化趋势.对照点ρ（OC）和ρ（EC）的相关性（0.49）低于常规点位（0.61）,对照点PM2.5中OC和EC的来源差异性更明显.8个碳组分的丰度分析表明,常规点位和对照点PM2.5中碳组分的来源基本一致,主要来源于道路尘、燃煤、机动车和生物质燃烧.绝对主因子分析法源解析结果表明,杭州市冬季PM2.5中总碳（TC）的主要来源中,燃煤/汽油车排放/道路尘、柴油车排放和生物质燃烧的分担率为79.1%、13.1%和3.5%.

英文摘要：

Aiming at investigating the characteristics and sources of carbonaceous species in PM2.5,samples were collected in seven routine urban sites and two background sites simultaneously from December 2013 to February 2014 in Hangzhou,China. The results showed that the average mass concentrations of organic carbon（OC）,elemental carbon（EC） and secondary organic carbon（SOC） were（23. 7 ± 7. 5）,（5. 0 ± 2. 4） and（9. 2 ± 4. 5） μg/m^3,respectively,and the average values of OC/EC and SOC/OC were（5. 3 ± 1. 9） and（0. 4 ± 0. 2）respectively. Spatially,the average mass concentrations of OC and EC at background sites were 0. 8 and 0. 6 times of those at routine urban sites,while the average mass concentration of SOC and the average value of OC/EC and SOC/OC at background sites were 1. 2,1. 2 and1. 3 times of those at routine urban sites,respectively. During the whole sampling time,the daily average mass concentrations of PM2.5at routine urban sites and background sites showed similar variation trends. Moreover,the average correlation coefficient between OC and EC（0. 49） at background sites was lower than that at routine urban sites（0. 61）. The percentages of eight carbon fractions in PM2.5indicated that the primary sources of carbon were road dust,coal combustion,vehicle exhaust and biomass burning both at the routine urban sites and background sites. The result of absolute principal component analysis（APCA） showed that coal combustion/gasoline vehicle exhaust/road dust（79. 1%）,diesel vehicle exhaust（13. 1%） and biomass burning（3. 5%） were the three main sources of total carbon（TC）in PM2.5during winter in Hangzhou.