Characterization of summer PM2.5 aerosols from four forest areas in Sichuan,SW China |
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| Affiliation: | 1. Rural Environment Protection Engineering & Technology Center of Sichuan Province, College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China;2. Meishan Environmental Monitoring Center, Meishan 620020, China;1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Jiaxing Environmental Monitoring Station, Jiaxing 314000, China;1. Department of Physics, University of Oviedo, C/ Calvo Sotelo, s/n, E-33007 Oviedo, Spain;2. Institute of Technology for Nanostructures (NST) and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Bismarckstr. 81, D-47057 Duisburg, Germany;1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. Shanghai Meteorological Service, Shanghai 200030, China;3. Shanghai Key Laboratory of Meteorology and Health, Shanghai 200135, China;1. Jiaxing Environmental Monitoring Station, Jiaxing 314000, China;2. Zhejiang Institute of Meteorological Sciences, Hangzhou 310008, China;3. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | Aerosol samples were collected over 24 and 12 h to represent day/night aerosol characteristics in forest areas at Ya’an Baima Spring Scenic Area (BM), Panzhihua Cycas National Nature Reserve (PZ), Gongga Mountain National Nature Reserve (GG), and Wolong National Nature Reserve (WL), during the summers of 2010–2012. Mass and chemical component concentrations, including organic carbon, elemental carbon, and inorganic ions (F−, Cl−, NO2−, NO3−, SO42−, C2O42−, PO43−, K+, Na+, Ca2+, Mg2+, and NH4+), of PM2.5 aerosols were measured. The average PM2.5 concentrations for 24 h were 72.42, 104.89, 20.55, and 29.19 μg/m3 at BM, PZ, GG, and WL, respectively. Organic matter accounted for 38.0–49.3%, while elemental carbon accounted for 2.0–5.7% of PM2.5 mass. The sum concentrations of SO42−, NH4+, and NO3− accounted for 23.0%, 17.4%, 22.1%, and 30.5% of PM2.5 mass at BM, PZ, GG, and WL, respectively. Soil dust was also an important source of PM2.5, accounting for 6.3%, 17.0%, 10.4%, and 19.1% of PM2.5 mass at BM, PZ, GG, and WL, respectively. These reconstructed masses accounted for 75.9–102.0% of PM2.5 mass from the four forest areas of SW China. |
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| Keywords: | Forest areas Mass closure Southwest China |
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