|
Atmos Chem Phys
| Title: | Observations of sesquiterpenes and their oxidation products in central Amazonia during the wet and dry seasons |
|
| Author(s): | Yee LD; Isaacman-VanWertz G; Wernis RA; Meng M; Rivera V; Kreisberg NM; Hering SV; Bering MS; Glasius M; Upshur MA; Be AG; Thomson RJ; Geiger FM; Offenberg JH; Lewandowski M; Kourtchev I; Kalberer M; de Sa S; Martin ST; Alexander ML; Palm BB; Hu W; Campuzano-Jost P; Day DA; Jimenez JL; Liu Y; McKinney KA; Artaxo P; Viegas J; Manzi A; Oliveira MB; de Souza R; Machado LAT; Longo K; Goldstein AH; |
|
| Address: | "Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, California 94720, USA. now at: Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA. Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California 94720, USA. Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720, USA. now at: Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, CA, USA. Aerosol Dynamics Inc., Berkeley, California 94710, USA. Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA. National Exposure Research Laboratory, Exposure Methods and Measurements Division, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA. Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA. Dept. of Chemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, USA. now at: Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, California 94720, USA. now at: Department of Chemistry, Colby College, Waterville, Maine 04901, USA. Department of Applied Physics, University of Sao Paulo, SP, Brazil. Instituto Nacional de Pesquisas da Amazonia, Manaus, AM, Brazil. Universidade do Estado do Amazonas, Manaus, AM, Brazil. Instituto Nacional de Pesquisas Espiacais, Sao Jose dos Campos, SP, Brazil. Instituto Nacional de Pesquisas Espiacais, Cachoeira Paulista, SP, Brazil" |
|
| Journal Title: | Atmos Chem Phys |
| Year: | 2018 |
| Volume: | 18 |
| Issue: | 14 |
| Page Number: | 10433 - 10457 |
| DOI: | |
|
| ISSN/ISBN: | 1680-7316 (Print) 1680-7324 (Electronic) 1680-7316 (Linking) |
|
| Abstract: | "Biogenic volatile organic compounds (BVOCs) from the Amazon forest region represent the largest source of organic carbon emissions to the atmosphere globally. These BVOC emissions dominantly consist of volatile and intermediate-volatility terpenoid compounds that undergo chemical transformations in the atmosphere to form oxygenated condensable gases and secondary organic aerosol (SOA). We collected quartz filter samples with 12 h time resolution and performed hourly in situ measurements with a semi-volatile thermal desorption aerosol gas chromatograph (SV-TAG) at a rural site ('T3') located to the west of the urban center of Manaus, Brazil as part of the Green Ocean Amazon (GoAmazon2014/5) field campaign to measure intermediate-volatility and semi-volatile BVOCs and their oxidation products during the wet and dry seasons. We speciated and quantified 30 sesquiterpenes and 4 diterpenes with mean concentrations in the range 0.01-6.04 ngm(-3) (1-670ppq(v)). We estimate that sesquiterpenes contribute approximately 14 and 12% to the total reactive loss of O(3) via reaction with isoprene or terpenes during the wet and dry seasons, respectively. This is reduced from ~ 50-70 % for within-canopy reactive O3 loss attributed to the ozonolysis of highly reactive sesquiterpenes (e.g., beta-caryophyllene) that are reacted away before reaching our measurement site. We further identify a suite of their oxidation products in the gas and particle phases and explore their role in biogenic SOA formation in the central Amazon region. Synthesized authentic standards were also used to quantify gas- and particle-phase oxidation products derived from beta-caryophyllene. Using tracer-based scaling methods for these products, we roughly estimate that sesquiterpene oxidation contributes at least 0.4-5 % (median 1 %) of total submicron OA mass. However, this is likely a low-end estimate, as evidence for additional unaccounted sesquiterpenes and their oxidation products clearly exists. By comparing our field data to laboratory-based sesquiterpene oxidation experiments we confirm that more than 40 additional observed compounds produced through sesquiterpene oxidation are present in Amazonian SOA, warranting further efforts towards more complete quantification" |
|
| Keywords: | |
|
| Notes: | "PubMed-not-MEDLINEYee, Lindsay D Isaacman-VanWertz, Gabriel Wernis, Rebecca A Meng, Meng Rivera, Ventura Kreisberg, Nathan M Hering, Susanne V Bering, Mads S Glasius, Marianne Upshur, Mary Alice Be, Ariana Gray Thomson, Regan J Geiger, Franz M Offenberg, John H Lewandowski, Michael Kourtchev, Ivan Kalberer, Markus de Sa, Suzane Martin, Scot T Alexander, M Lizabeth Palm, Brett B Hu, Weiwei Campuzano-Jost, Pedro Day, Douglas A Jimenez, Jose L Liu, Yingjun McKinney, Karena A Artaxo, Paulo Viegas, Juarez Manzi, Antonio Oliveira, Maria B de Souza, Rodrigo Machado, Luiz A T Longo, Karla Goldstein, Allen H eng EPA999999/ImEPA/Intramural EPA/ Germany 2018/07/23 Atmos Chem Phys. 2018 Jul 23; 18(14):10433-10457" |
|
|
|
|
