AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Characteristics and Source Apportionment of Marine Aerosol over Chinese Seas
MEI ZHENG, Huaiyu Fu, Caiqing Yan, Xiaoying Li, Peking University
Abstract Number: 602 Working Group: Source Apportionment
Abstract Under appropriate meteorological conditions, urban emissions can be transported to marine environment and deposit into the ocean. This study aims to investigate atmospheric particulate emissions from northern China and the changes of its physical and chemical properties during the transport from land to sea. As part of a major ocean field campaign, online and offline aerosol sampling were performed over Yellow Sea and Bohai Sea over three weeks from November 2 to 21, 2012 using real-time instrument Single Particle Aerosol Mass Spectrometry (SPAMS), Fast Mobility Particle Sizer (FMPS) and high volume sampler. SPAMS can provide online size and chemical composition information for each single particle in the size range of 200 to 2000 nm, while FMPS gives size information of finer particles (5.6-560 nm). With the analysis of quartz filters by the high volume sampler, detailed organic speciation provides information of composition and concentration of various organic compounds such as polycyclic aromatic hydrocarbons (PAHs), fatty acids, alkanes and others. Source apportionment of fine atmospheric particles in marine environment is conducted to estimate the impact of urban anthropogenic emissions from land with SPAMS online and high-volume offline chemical composition data. During the field campaign, about five particle episodes were observed. Based on particle size and composition date provided by FMPS and SPAMS, it revealed that sources and mechanisms of these five episodes might be different. Trajectory analyses were performed to better understand sources of these particles. As moving away from land, particle number decreased with distance and particle size shifted to slightly larger size. The changes of source impacts and inorganic and organic pollutants will be also discussed.