Ambient Gas-Particle Partitioning of Tracers for Biogenic Oxidation
Year: 2016
Type: article
Abstract: Exchange of atmospheric organic compounds between gas and particle phases is important in the production and chemistry of particle-phase mass but is poorly understood due to a lack of simultaneous measurements in both phases of individual compounds. Measurements of particle- and gas-phase organic compounds are reported here for the southeastern United States and central Amazonia. Polyols formed from isoprene oxidation contribute 8% and 15% on average to particle-phase organic mass at these sites but are also observed to have substantial gas-phase concentrations contrary to many models that treat these compounds as nonvolatile. The results of the present study show that the gas-particle partitioning of approximately 100 known and newly observed oxidation products is not well explained by environmental factors (e.g., temperature). Compounds having high vapor pressures have higher particle fractions than expected from absorptive equilibrium partitioning models. These observations support the conclusion that many commonly measured biogenic oxidation products may be bound in low-volatility mass (e.g., accretion products, inorganic-organic adducts) that decomposes to individual compounds on analysis. However, the nature and extent of any such bonding remains uncertain. Similar conclusions are reach for both study locations, and average particle fractions for a given compound are consistent within ∼25% across measurement sites.
Authors: Gabriel Isaacman-VanWertz, Lindsay D. Yee, Nathan M. Kreisberg, Rebecca Wernis, Joshua A. Moss, Susanne V. Hering, Suzane S. de Sá, Scot T. Martin, M. Lizabeth Alexander, Brett B. Palm, Weiwei Hu, Pedro Campuzano-Jost, Douglas A. Day, Jose L. Jimenez, Matthieu Riva, Jason D. Surratt, Juarez Viegas, Antonio Manzi, Eric Edgerton, Karsten Baumann, Rodrigo Souza, Paulo Artaxo, Allen H. Goldstein
Institutions: University of California, Berkeley, Aerosol Dynamics (United States), Harvard University, Pacific Northwest National Laboratory, Environmental Molecular Sciences Laboratory, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, University of North Carolina at Chapel Hill, Instituto Nacional de Pesquisas da Amazônia, Universidade do Estado do Amazonas, Universidade de São Paulo
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Environmental Protection Agency, American Mathematical Society, Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Instituto Nacional de Pesquisas da Amazônia, Directorate for Geosciences, National Oceanic and Atmospheric Administration, National Institute of Food and Agriculture, Office of Science, Directorate for STEM Education, Division of Graduate Education, Biological and Environmental Research, Climate Program Office
Awards: G1186038202, G2361709196, G7560925394
OpenAlex ID: W2518074247