摘要
通过对我国近年来碳质气溶胶相关研究成果进行整理,系统总结了我国碳质气溶胶时空分布及其气候效应.通过搜集已有离线观测数据,发现背景观测点PM_(2.5)中有机碳(OC)和元素碳(EC)浓度分别小于5和1μg/m^(3),城市PM_(2.5)中OC浓度范围为3.78~30μg/m^(3)(平均值为11.98μg/m^(3)),EC浓度在0.69~10μg/m^(3)范围内变化(平均值为3.93μg/m^(3)),其中高值区主要分布在胡焕庸线(黑河-腾冲线)及其以北区域,如东北区域、汾渭平原区域、京津冀区域、兰州盆地和四川盆地.同时,PM_(2.5)中OC/EC比值和二次有机碳在总有机碳中占比(SOC/OC)随海拔具有相似的变化趋势.碳质气溶胶的气候效应也强烈依赖于在边界层内所处高度,其在边界层上层可通过辐射效应抑制边界层发展,而在近地面的碳质气溶胶对边界层的发展具有促进作用.
By sorting out the research results related to carbonaceous aerosols in recent years in China,the spatiotemporal distribution and climate effect of carbonaceous aerosols in China were systematically summarized.Through the collection of existing offline observation data,it is found that the organic carbon(OC)and elemental carbon(EC)in PM_(2.5) in field observation points were less than 5μg/m^(3) and 1μg/m^(3) respectively,and the OC concentration in urban ranges from 3.78 to 30μg/m^(3)(the average value was 11.98μg/m^(3)),the mass concentration range of EC was 0.69~10μg/m^(3)(the average value was 3.93μg/m^(3)),and the high value are mainly distributed in the Hu Huanyong Line(Heihe-Tengchong Line)and the north regions,such as the northeast region,the Fenwei Plain region,the Beijing-Tianjin-Hebei region,Lanzhou Basin and Sichuan Basin.At the same time,OC/EC and SOC/OC in PM_(2.5) had similar trends with altitude.Carbonaceous aerosols in the different heights within boundary layer had varying effects.Carbonaceous aerosol at upper layer of the boundary layer could inhibit the development of the boundary layer through the radiation effect,while those near the surface can promote the development of the boundary layer.
作者
祁少锋
赵素平
殷代英
余晔
何建军
QI Shao-feng;ZHAO Su-ping;YIN Dai-ying;YU Ye;HE Jian-jun(Key Laboratory of Land Surface Processes and Climate Change in Cold and Arid Regions,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Pingliang Land Surface Process and Disaster Weather Observation and Research Station,Chinese Academy of Sciences,Pingliang 744015,China;Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Aciences,Beijing 100081,China)
出处
《中国环境科学》
CSCD
北大核心
2023年第S1期28-37,384-385,共12页
China Environmental Science
基金
国家自然科学基金资助项目(42075185,41605103)
中国科学院青年创新促进会优秀会员资助项目(Y2021111)
关键词
大气污染
元素碳
有机碳
时空分布
地形
air pollution
elemental carbon
organic carbon
spatiotemporal pattern
terrain
