State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, Beijing, China.
Environ Pollut. 2017 Oct;229:350-361. doi: 10.1016/j.envpol.2017.05.015. Epub 2017 Jun 10.
Although organic compounds in marine atmospheric aerosols have significant effects on climate and marine ecosystems, they have rarely been studied, especially in the coastal regions of East China. To assess the origins of the organic aerosols in the East China coastal atmosphere, PM samples were collected from the atmospheres of the Yellow Sea, the East China Sea, and Changdao Island during the CAPTAIN (Campaign of Air PolluTion At INshore Areas of Eastern China) field campaign in the spring of 2011. The marine atmospheric aerosol samples that were collected were grouped based on the backward trajectories of their air masses. The organic carbon concentrations in the PM samples from the marine and Changdao Island atmospheres were 5.5 ± 3.1 μgC/m and 6.9 ± 2.4 μgC/m, respectively, which is higher than in other coastal water atmospheres. The concentration of polycyclic aromatic hydrocarbons (PAHs) in the marine atmospheric PM samples was 17.0 ± 20.2 ng/m, indicating significant continental anthropogenic influences. The influences of fossil fuels and biomass burning on the composition of organic aerosols in the coastal atmosphere of East China were found to be highly dependent on the origins of the air masses. Diesel combustion had a strong impact on air masses from the Yangtze River Delta (YRD), and gasoline emissions had a more significant impact on the "North China" marine atmospheric samples. The "Northeast China" marine atmospheric samples were most impacted by biomass burning. Coal combustion contributed significantly to the compositions of all of the atmospheric samples. The proportions of secondary compounds increased as samples aged in the marine atmosphere indicating that photochemical oxidation occured during transport. Our results quantified ecosystem effects on marine atmospheric aerosols and highlighted the uncertainties that arise when modeling marine atmospheric PM without considering high spatial resolution source data and meteorological parameters.
尽管海洋大气气溶胶中的有机化合物对气候和海洋生态系统有重要影响，但它们很少被研究，尤其是在中国东部的沿海地区。为了评估中国东部沿海大气中有机气溶胶的来源，在 2011 年春季的 CAPTAIN（中国东部近海地区大气污染研究）野外考察中，采集了来自黄海、东海和长岛大气的 PM 样品。根据气团的后向轨迹，对采集到的海洋大气气溶胶样品进行了分组。海洋大气和长岛大气中 PM 样品的有机碳浓度分别为 5.5±3.1μgC/m 和 6.9±2.4μgC/m，高于其他沿海水域大气中的浓度。海洋大气 PM 样品中多环芳烃（PAHs）的浓度为 17.0±20.2ng/m，表明存在明显的大陆人为影响。化石燃料和生物质燃烧对中国东部沿海大气中有机气溶胶组成的影响，取决于气团的起源。柴油燃烧对来自长江三角洲（YRD）的气团有强烈影响，而汽油排放对“华北”海洋大气样品的影响更为显著。“东北”海洋大气样品受生物质燃烧的影响最大。煤炭燃烧对所有大气样品的组成都有重要贡献。随着在海洋大气中老化，二次化合物的比例增加，表明在运输过程中发生了光化学氧化。我们的研究结果量化了生态系统对海洋大气气溶胶的影响，并强调了在不考虑高空间分辨率源数据和气象参数的情况下，对海洋大气 PM 进行建模所产生的不确定性。
