Characterization of fine primary biogenic organic aerosol in an urban area in the northeastern United States |
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| Authors: | Esther Coz Begoña Artíñano Lisa M Clark Mark Hernandez Allen L Robinson Gary S Casuccio Traci L Lersch Spyros N Pandis |
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| Institution: | 1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China;2. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou 730000, China;3. Emory University, Atlanta, Georgia (GA), United States;4. Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi 221005, India;5. China National Environmental Monitoring Center, Beijing 100012, China;6. Chubu Institute for Advanced Studies, Chubu University, Kasugai 487-8501, Japan;7. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;8. University of Chinese Academy of Sciences, Beijing 100049, China;9. Institute of Surface-Earth System, Tianjin University, Tianjin 300072, China |
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| Abstract: | Scanning electron microscopy coupled to energy-dispersive x-ray spectroscopy (SEM/EDX) was used to quantify individual bioparticles in PM2.5 samples collected during the Pittsburgh Air Quality Study. Microscopy-based estimates of primary biogenic organic aerosol (PBOA) mass were compared to carbohydrate mass associated with PM2.5. Carbohydrates show substantial seasonal variations, with higher concentrations in the spring and the fall. During the summer, carbohydrates were about 30% of the estimated PBOA concentrations, but in the winter carbohydrate concentrations often greatly exceeded the PBOA mass estimate. Spores and insect detritus were the most abundant PBOA types in the summer samples, while winter samples were comprised predominantly of a mixture of microorganisms, insect and vegetative detritus. During the summer PBOA contributed on average 6.9 ± 5.4% by mass of the PM2.5 versus 3.3 ± 1.4% of the PM2.5 mass during the winter. |
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