Observational Insights into Aerosol Formation from Isoprene
- David R. Worton
- ,
- Jason D. Surratt
- ,
- Brian W. LaFranchi
- ,
- Arthur W. H. Chan
- ,
- Yunliang Zhao
- ,
- Robin J. Weber
- ,
- Jeong-Hoo Park
- ,
- Jessica B. Gilman
- ,
- Joost de Gouw
- ,
- Changhyoun Park
- ,
- Gunnar Schade
- ,
- Melinda Beaver
- ,
- Jason M. St. Clair
- ,
- John Crounse
- ,
- Paul Wennberg
- ,
- Glenn M. Wolfe
- ,
- Sara Harrold
- ,
- Joel A. Thornton
- ,
- Delphine K. Farmer
- ,
- Kenneth S. Docherty
- ,
- Michael J. Cubison
- ,
- Jose-Luis Jimenez
- ,
- Amanda A. Frossard
- ,
- Lynn M. Russell
- ,
- Kasper Kristensen
- ,
- Marianne Glasius
- ,
- Jingqiu Mao
- ,
- Xinrong Ren
- ,
- William Brune
- ,
- Eleanor C. Browne
- ,
- Sally E. Pusede
- ,
- Ronald C. Cohen
- ,
- John H. Seinfeld
- , and
- Allen H. Goldstein
Abstract

Atmospheric photooxidation of isoprene is an important source of secondary organic aerosol (SOA) and there is increasing evidence that anthropogenic oxidant emissions can enhance this SOA formation. In this work, we use ambient observations of organosulfates formed from isoprene epoxydiols (IEPOX) and methacrylic acid epoxide (MAE) and a broad suite of chemical measurements to investigate the relative importance of nitrogen oxide (NO/NO2) and hydroperoxyl (HO2) SOA formation pathways from isoprene at a forested site in California. In contrast to IEPOX, the calculated production rate of MAE was observed to be independent of temperature. This is the result of the very fast thermolysis of MPAN at high temperatures that affects the distribution of the MPAN reservoir (MPAN / MPA radical) reducing the fraction that can react with OH to form MAE and subsequently SOA (FMAE formation). The strong temperature dependence of FMAE formation helps to explain our observations of similar concentrations of IEPOX-derived organosulfates (IEPOX-OS; ∼1 ng m–3) and MAE-derived organosulfates (MAE-OS; ∼1 ng m–3) under cooler conditions (lower isoprene concentrations) and much higher IEPOX-OS (∼20 ng m–3) relative to MAE-OS (<0.0005 ng m–3) at higher temperatures (higher isoprene concentrations). A kinetic model of IEPOX and MAE loss showed that MAE forms 10−100 times more ring-opening products than IEPOX and that both are strongly dependent on aerosol water content when aerosol pH is constant. However, the higher fraction of MAE ring opening products does not compensate for the lower MAE production under warmer conditions (higher isoprene concentrations) resulting in lower formation of MAE-derived products relative to IEPOX at the surface. In regions of high NOx, high isoprene emissions and strong vertical mixing the slower MPAN thermolysis rate aloft could increase the fraction of MPAN that forms MAE resulting in a vertically varying isoprene SOA source.
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- Christiane Schulz, Johannes Schneider, Bruna Amorim Holanda, Oliver Appel, Anja Costa, Suzane S. de Sá, Volker Dreiling, Daniel Fütterer, Tina Jurkat-Witschas, Thomas Klimach, Christoph Knote, Martina Krämer, Scot T. Martin, Stephan Mertes, Mira L. Pöhlker, Daniel Sauer, Christiane Voigt, Adrian Walser, Bernadett Weinzierl, Helmut Ziereis, Martin Zöger, Meinrat O. Andreae, Paulo Artaxo, Luiz A. T. Machado, Ulrich Pöschl, Manfred Wendisch, Stephan Borrmann. Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region. Atmospheric Chemistry and Physics 2018, 18 (20) , 14979-15001. https://doi.org/10.5194/acp-18-14979-2018
- Xi Chen, Mingjie Xie, Michael D. Hays, Eric Edgerton, Donna Schwede, John T. Walker. Characterization of organic nitrogen in aerosols at a forest site in the southern Appalachian Mountains. Atmospheric Chemistry and Physics 2018, 18 (9) , 6829-6846. https://doi.org/10.5194/acp-18-6829-2018
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- James W. Grayson, Erin Evoy, Mijung Song, Yangxi Chu, Adrian Maclean, Allena Nguyen, Mary Alice Upshur, Marzieh Ebrahimi, Chak K. Chan, Franz M. Geiger, Regan J. Thomson, Allan K. Bertram. The effect of hydroxyl functional groups and molar mass on the viscosity of non-crystalline organic and organic–water particles. Atmospheric Chemistry and Physics 2017, 17 (13) , 8509-8524. https://doi.org/10.5194/acp-17-8509-2017
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- Christopher D. Cappa, Shantanu H. Jathar, Michael J. Kleeman, Kenneth S. Docherty, Jose L. Jimenez, John H. Seinfeld, Anthony S. Wexler. Simulating secondary organic aerosol in a regional air quality model using the statistical oxidation model – Part 2: Assessing the influence of vapor wall losses. Atmospheric Chemistry and Physics 2016, 16 (5) , 3041-3059. https://doi.org/10.5194/acp-16-3041-2016
- Sri Hapsari Budisulistiorini, Karsten Baumann, Eric S. Edgerton, Solomon T. Bairai, Stephen Mueller, Stephanie L. Shaw, Eladio M. Knipping, Avram Gold, Jason D. Surratt. Seasonal characterization of submicron aerosol chemical composition and organic aerosol sources in the southeastern United States: Atlanta, Georgia,and Look Rock, Tennessee. Atmospheric Chemistry and Physics 2016, 16 (8) , 5171-5189. https://doi.org/10.5194/acp-16-5171-2016
- Pawel K. Misztal, Jeremy C. Avise, Thomas Karl, Klaus Scott, Haflidi H. Jonsson, Alex B. Guenther, Allen H. Goldstein. Evaluation of regional isoprene emission factors and modeled fluxes in California. Atmospheric Chemistry and Physics 2016, 16 (15) , 9611-9628. https://doi.org/10.5194/acp-16-9611-2016
- Jesse O. Bash, Kirk R. Baker, Melinda R. Beaver. Evaluation of improved land use and canopy representation in BEIS v3.61 with biogenic VOC measurements in California. Geoscientific Model Development 2016, 9 (6) , 2191-2207. https://doi.org/10.5194/gmd-9-2191-2016
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- T. B. Nguyen, J. D. Crounse, R. H. Schwantes, A. P. Teng, K. H. Bates, X. Zhang, J. M. St. Clair, W. H. Brune, G. S. Tyndall, F. N. Keutsch, J. H. Seinfeld, P. O. Wennberg. Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds. Atmospheric Chemistry and Physics 2014, 14 (24) , 13531-13549. https://doi.org/10.5194/acp-14-13531-2014
- Q. T. Nguyen, M. K. Christensen, F. Cozzi, A. Zare, A. M. K. Hansen, K. Kristensen, T. E. Tulinius, H. H. Madsen, J. H. Christensen, J. Brandt, A. Massling, J. K. Nøjgaard, M. Glasius. Understanding the anthropogenic influence on formation of biogenic secondary organic aerosols in Denmark via analysis of organosulfates and related oxidation products. Atmospheric Chemistry and Physics 2014, 14 (17) , 8961-8981. https://doi.org/10.5194/acp-14-8961-2014
- K. Kristensen, K. L. Enggrob, S. M. King, D. R. Worton, S. M. Platt, R. Mortensen, T. Rosenoern, J. D. Surratt, M. Bilde, A. H. Goldstein, M. Glasius. Formation and occurrence of dimer esters of pinene oxidation products in atmospheric aerosols. Atmospheric Chemistry and Physics 2013, 13 (7) , 3763-3776. https://doi.org/10.5194/acp-13-3763-2013