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Special Session 5: Ocean-atmosphere interaction, multi-scale climate variability and their implication for biogeochemical processes |
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Characteristics and origins of organic aerosols in the coastal atmosphere of East China
Tuesday 10th @ 1605-1625
Room 1
Song Guo* , State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China
Dongjie Shang, State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China
Qingfeng Guo, State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China
Qi Zou, State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China
Min Hu, State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China
Presenter Email: guosong@pku.edu.cn
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| In order to assess the origin of the atmospheric organic aerosols in coastal waters of East China, high spatial resolution PM2.5 samples were collected on board in atmosphere of Yellow Sea and East China Sea, and 24h-PM2.5 samples were obtained in a coastal site, Changdao Island during CAPTAIN (Campaign of Air PolluTion At INshore Areas of Eastern China) 2011 spring field campaign. And the marine samples were grouped by their trajectory character, representing the influence from different continental origin. Organic carbon was 5.5±3.1 μgC/m3 and 6.9±2.4 μgC/m3 in atmospheric PM2.5 in marine area and Changdao Island, showing higher concentration than other coastal waters. Fossil fuel combustion had a significant impact on marine aerosols when the air mass was from North China, Northeast China and Yangtze River Delta area, with coal and diesel profile like distribution of n-alkanes, and high PAHs concentration at 465.7ng/m3, 185.4 ng/m3 and 194.1 ng/m3, respectively. Biomass burning contribution from North China and Northeast China were found by higher level of levoglucosan (53±13 ng/m3 and 49±15 ng/m3). Even though marine natural emission and secondary oxidation contributed to lipid compounds during long-range-transport, the fraction of secondary oxidation tracers in total compounds was stable among Changdao Island samples and marine samples, implying that the aerosols were already highly aged when outflowed from the sea shore. |
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