| Title: | Seasonal characteristics of biogenic secondary organic aerosol tracers in a deciduous broadleaf forest in northern Japan |
| Author(s): | Haque MM; Verma SK; Deshmukh DK; Kunwar B; Kawamura K; |
| Address: | "Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology, Nanjing, 210044, China; School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan. Electronic address: mhaque@nuist.edu.cn. Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan; State Forensic Science Laboratory, Home Department, Government of Chhattisgarh, Raipur, 492-001, India. Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695-002, India; Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan. Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan. Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan; Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan. Electronic address: kkawamura@isc.chubu.ac.jp" |
| DOI: | 10.1016/j.chemosphere.2022.136785 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "We collected total suspended particulate (TSP) samples from January 2010 to December 2010 at Sapporo deciduous forest to understand the oxidation processes of biogenic volatile organic compounds (BVOCs). The gas chromatography-mass spectrometric technique was applied to determine biogenic secondary organic aerosols (BSOAs) in the TSP samples. We found the predominance of the isoprene SOA (iSOA) tracers (20.6 ng m(-3)) followed by alpha/beta-pinene SOA (pSOA) tracers (8.25 ng m(-3)) and beta-caryophyllene SOA (cSOA) tracer (1.53 ng m(-3)) in the forest aerosols. The results showed large isoprene fluxes and relatively high levels of oxidants in the forest atmosphere. The iSOA and pSOA tracers showed a clear seasonal trend with summer and autumn maxima and winter and spring minima. Their seasonal trends were mainly controlled by BVOCs emission from the local broadleaf deciduous forest. Additionally, the regional level of isoprene emissions from the oceanic sources may also be contributed during summertime aerosols. cSOA tracer showed high concentrations in the winter and spring, possibly due to an additional contribution of biomass burning (BB) aerosols from the local or regional BB activities. The biogenic secondary organic carbon (BSOC) was contributed mainly by the oxidation products of isoprene (136 ngC m(-)(3)) followed by beta-caryophyllene (63.0 ngC m(-3)) and alpha/beta-pinene (35.9 ngC m(-3)). The mass concentration ratio (0.92) of pinonic acid + pinic acid and 3-methyl-1,2,3-butanetricarboxylic acid ((PNA + PA)/3-MBTCA) indicates the photochemical transformation of first-generation oxidation products to the higher generation oxidation products. The average ratios of isoprene to alpha/beta-pinene (1.64) and beta-caryophyllene (18.6) oxidation products suggested a large difference in the emissions of isoprene and alpha/beta-pinene compared to beta-caryophyllene. The cSOA tracers in the forest aerosols are also contributed by BB during the winter and spring. Positive matrix factorization analyses of the BSOA tracers confirmed that organic aerosols of deciduous forests are mostly related to isoprene emissions. This study suggests that isoprene is a more significant precursor for the BSOA than alpha/beta-pinene and beta-caryophyllene in a broadleaf deciduous forest" |
| Keywords: | *Air Pollutants/analysis Seasons Japan Aerosols/analysis *Volatile Organic Compounds/analysis Forests Biogenic emissions Biogenic secondary organic aerosols Deciduous forest Isoprene abundance; |
| Notes: | "MedlineHaque, Md Mozammel Verma, Santosh Kumar Deshmukh, Dhananjay K Kunwar, Bhagawati Kawamura, Kimitaka eng England 2022/10/19 Chemosphere. 2023 Jan; 311(Pt 1):136785. doi: 10.1016/j.chemosphere.2022.136785. Epub 2022 Oct 15" |
