中文关键词有机碳(OC)元素碳(EC)浓度分布粒径分布季节变化 英文关键词organic carbon(OC)elemental carbon(EC)concentration distributionssize distributionsseasonal changes

作者	单位	E-mail
李安娜	成都信息工程大学大气科学学院, 成都 610225 中国科学院大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029	lianna@dq.cern.ac.cn
温天雪	中国科学院大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029	wtx@dq.cern.ac.cn
华维	成都信息工程大学大气科学学院, 成都 610225
杨员	中国科学院大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029
孟泽	中国科学院华南植物园, 广州 510650
胡波	中国科学院大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029
辛金元	成都信息工程大学大气科学学院, 成都 610225 中国科学院大气物理研究所, 大气边界层物理和大气化学国家重点实验室, 北京 100029

中文摘要 为了解华南背景区域鼎湖山站碳质气溶胶的浓度水平与来源，采用DRI Model 2001A热/光碳分析仪测定了鼎湖山站大气颗粒物分级样品中的有机碳（OC）与元素碳（EC）浓度水平，并分析了碳质组分的浓度特征和粒径分布.结果表明，在PM_1.1、PM_2.1和PM_9.0中，鼎湖山OC的平均质量浓度分别为（5.6±2.0）、（7.3±2.4）和（12.8±4.0）μg ·m^-3，EC的平均质量浓度分别为（2.3±1.4）、（2.7±1.6）和（3.4±1.7）μg ·m^-3.PM_1.1和PM_2.1中OC分别占PM_9.0中OC的43.8%和57.0%，EC占67.6%和79.4%.OC和EC主要富集在细粒子中.PM_1.1和PM_2.1中OC和EC在秋季最高，OC在冬季最低，EC在夏季最低.PM_9.0中OC夏季最高.鼎湖山中碳质气溶胶以OC2、EC1、OC3和OC4为主，夏季OC3>EC1，生物排放源增强，冬季EC1质量浓度最高，局地的机动车排放源更强.OC和EC在4个季节都呈现双峰型分布，细粒径段峰值位于0.43~0.65 μm，粗粒径段峰值出现在3.3~5.8 μm.PM_1.1和PM_2.1中OC以一次排放为主，二次有机碳（SOC）在春季最高[（3.0±1.4）μg ·m^-3]，冬季最低[（1.3±1.4）μg ·m^-3]，春季二次转化更强.鼎湖山大气细粒径段OC主要来自燃煤和机动车排放，粗粒径段主要来自生物源排放，EC主要受到燃煤、机动车排放和扬尘的影响. 英文摘要 To understand the characterization and sources of carbonaceous aerosols at Mountain Dinghu, organic carbon (OC) and elemental carbon (EC) in size-resolved aerosol samples were measured at a regional background site in South China using a DRI Model 2001A analyzer. The average mass concentrations of organic carbon (OC) are (5.6±2.0) μg ·m^-3 in PM_1.1, (7.3±2.4) μg ·m^-3 in PM_2.1, and (12.8±4.0) μg ·m^-3 in PM_9.0; the average mass concentrations of elemental carbon (EC) are (2.3±1.4) μg ·m^-3in PM_1.1, (2.7±1.6) μg ·m^-3 in PM_2.1, and (3.4±1.7) μg ·m^-3 in PM_9.0. OC concentrations in PM_1.1 and PM_2.1 account for 43.8% and 57.0% of OC in PM_9.0, and EC concentrations in PM_1.1 and PM_2.1 account for 67.6% and 79.4%, respectively. OC and EC are enriched with fine particles. In PM_1.1 and PM_2.1, the highest concentrations of OC and EC are measured in autumn, and the lowest concentration of OC is measured in winter and EC in summer. In PM_9.0, the highest OC concentration is measured in summer. Carbonaceous aerosols are mainly composed of OC2, EC1, OC3, and OC4. In summer, the concentration of OC3 is higher than that of EC1, suggesting that biogenic sources are dominant during summer. The concentration of EC1 in winter is the highest, indicating that the impacts of motor vehicle emissions are prominent in the local area during winter. OC and EC both show bimodal distributions in four seasons, with peaks in the size ranges of 0.43-0.65 μm for fine particles and 3.3-5.8 μm for coarse particles. In PM_1.1 and PM_2.1, the sources of OC are mainly primary emissions. In PM_2.1, the highest concentration of SOC is measured in spring at (3.0±1.4) μg ·m^-3 and the lowest in winter at (1.3±1.4) μg ·m^-3, indicating that the secondary aerosol formation is significant in spring. At the Mountain Dinghu background site, OC is mainly from coal combustion and motor vehicle emissions for fine particles and from biogenic sources for coarse particles. EC is mainly from coal combustion, motor vehicle emissions, and dust.

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