HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Institute of Low Temperature Science >
Peer-reviewed Journal Articles, etc >

Emissions of biogenic volatile organic compounds and subsequent formation of secondary organic aerosols in a Larix kaempferi forest

Creative Commons License

Files in This Item:
acp-15-12029-2015.pdf613.63 kBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Emissions of biogenic volatile organic compounds and subsequent formation of secondary organic aerosols in a Larix kaempferi forest
Authors: Mochizuki, T. Browse this author
Miyazaki, Y. Browse this author →KAKEN DB
Ono, K. Browse this author
Wada, R. Browse this author
Takahashi, Y. Browse this author
Saigusa, N. Browse this author
Kawamura, K. Browse this author
Tani, A. Browse this author
Issue Date: 29-Oct-2015
Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
Journal Title: Atmospheric Chemistry and Physics
Volume: 15
Issue: 20
Start Page: 12029
End Page: 12041
Publisher DOI: 10.5194/acp-15-12029-2015
Abstract: We conducted simultaneous measurements of concentrations and above-canopy fluxes of isoprene and - pinene, along with their oxidation products in aerosols in a Larix kaempferi (Japanese larch) forest in summer 2012. Vertical profiles of isoprene showed the maximum concentration near the forest floor with a peak around noon, whereas oxidation products of isoprene, i.e., methacrolein (MACR) and methyl vinyl ketone (MVK), showed higher concentrations near the canopy level of the forest. The vertical profile suggests large emissions of isoprene near the forest floor, likely due to Dryopteris crassirhizoma (a fern species), and the subsequent reaction within the canopy. The concentrations of - pinene also showed highest values near the forest floor, with maximums in the early morning and late afternoon. The vertical profiles of -pinene suggest its large emissions from soil and litter in addition to emissions from L. kaempferi leaves at the forest site. Isoprene and its oxidation products in aerosols exhibited similar diurnal variations within the forest canopy, providing evidence of secondary organic aerosol (SOA) formation via oxidation of isoprene most likely emitted from the forest floor. Although high abundance of - pinene was observed in the morning, its oxidation products in aerosols showed peaks in daytime, due to a time lag between the emission and atmospheric reactions of -pinene to form SOA. Positive matrix factorization (PMF) analysis indicated that anthropogenic influence is the most important factor contributing to the elevated concentrations of molecular oxidation products of isoprene- ( > 64 %) and -pinenederived SOA (> 57 %). The combination of the measuredfluxes and vertical profiles of biogenic volatile organic compounds (BVOCs) suggests that the inflow of anthropogenic precursors/aerosols likely enhanced the formation of both isoprene SOA and -pinene SOA within the forest canopy even when the BVOC flux was relatively low. This study highlights the importance of intra-canopy processes that promote biogenic SOA formation in the presence of significant inflow of oxidants together with anthropogenic aerosols and their precursors
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 宮崎 雄三

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


Feedback - Hokkaido University