Exploration of oxidative chemistry and secondary organic aerosol formation in the Amazon during the wet season: explicit modeling of the Manaus urban plume with GECKO-A

C. Mouchel-Vallon; C. Mouchel-Vallon; J. Lee-Taylor; J. Lee-Taylor; A. Hodzic; P. Artaxo; B. Aumont; M. Camredon; D. Gurarie; J.-L. Jimenez; J.-L. Jimenez; D. H. Lenschow; S. T. Martin; S. T. Martin; J. Nascimento; J. Nascimento; J. J. Orlando; B. B. Palm; B. B. Palm; B. B. Palm; J. E. Shilling; M. Shrivastava; S. Madronich

doi:10.5194/acp-20-5995-2020

Atmospheric Chemistry and Physics (May 2020)

Exploration of oxidative chemistry and secondary organic aerosol formation in the Amazon during the wet season: explicit modeling of the Manaus urban plume with GECKO-A

C. Mouchel-Vallon,
C. Mouchel-Vallon,
J. Lee-Taylor,
J. Lee-Taylor,
A. Hodzic,
P. Artaxo,
B. Aumont,
M. Camredon,
D. Gurarie,
J.-L. Jimenez,
J.-L. Jimenez,
D. H. Lenschow,
S. T. Martin,
S. T. Martin,
J. Nascimento,
J. Nascimento,
J. J. Orlando,
B. B. Palm,
B. B. Palm,
B. B. Palm,
J. E. Shilling,
M. Shrivastava,
S. Madronich

Affiliations

C. Mouchel-Vallon: Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, CO 80301, USA
C. Mouchel-Vallon: now at: Laboratoire d'Aérologie, Université de Toulouse, CNRS, UPS, Toulouse, France
J. Lee-Taylor: Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, CO 80301, USA
J. Lee-Taylor: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309, USA
A. Hodzic: Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, CO 80301, USA
P. Artaxo: Institute of Physics, University of São Paulo, Rua do Matão 1371, São Paulo, S.P. 05508-090, Brazil
B. Aumont: LISA, UMR CNRS 7583, Université Paris-Est-Créteil, Université de Paris, Institut Pierre Simon Laplace, Créteil, France
M. Camredon: LISA, UMR CNRS 7583, Université Paris-Est-Créteil, Université de Paris, Institut Pierre Simon Laplace, Créteil, France
D. Gurarie: Department of Mathematics and Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH 44106-7080, USA
J.-L. Jimenez: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309, USA
J.-L. Jimenez: Department of Chemistry, University of Colorado, Boulder, CO 80309, USA
D. H. Lenschow: Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, CO 80301, USA
S. T. Martin: School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02318, USA
S. T. Martin: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02318, USA
J. Nascimento: Post-graduate Program in Climate and Environment, National Institute for Amazonian Research and Amazonas State University, Manaus, AM, Brazil
J. Nascimento: Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO 80305, USA
J. J. Orlando: Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, CO 80301, USA
B. B. Palm: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309, USA
B. B. Palm: Department of Chemistry, University of Colorado, Boulder, CO 80309, USA
B. B. Palm: now at: Department of Atmospheric Sciences, University of Washington, Seattle, WA 91895, USA
J. E. Shilling: Pacific Northwest National Laboratory, Richland, WA 99352, USA
M. Shrivastava: Pacific Northwest National Laboratory, Richland, WA 99352, USA
S. Madronich: Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, CO 80301, USA

DOI: https://doi.org/10.5194/acp-20-5995-2020
Journal volume & issue: Vol. 20
pp. 5995 – 6014

Abstract

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The GoAmazon 2014/5 field campaign took place in Manaus, Brazil, and allowed the investigation of the interaction between background-level biogenic air masses and anthropogenic plumes. We present in this work a box model built to simulate the impact of urban chemistry on biogenic secondary organic aerosol (SOA) formation and composition. An organic chemistry mechanism is generated with the Generator for Explicit Chemistry and Kinetics of Organics in the Atmosphere (GECKO-A) to simulate the explicit oxidation of biogenic and anthropogenic compounds. A parameterization is also included to account for the reactive uptake of isoprene oxidation products on aqueous particles. The biogenic emissions estimated from existing emission inventories had to be reduced to match measurements. The model is able to reproduce ozone and NOx for clean and polluted situations. The explicit model is able to reproduce background case SOA mass concentrations but does not capture the enhancement observed in the urban plume. The oxidation of biogenic compounds is the major contributor to SOA mass. A volatility basis set (VBS) parameterization applied to the same cases obtains better results than GECKO-A for predicting SOA mass in the box model. The explicit mechanism may be missing SOA-formation processes related to the oxidation of monoterpenes that could be implicitly accounted for in the VBS parameterization.

Published in Atmospheric Chemistry and Physics

ISSN: 1680-7316 (Print); 1680-7324 (Online)
Publisher: Copernicus Publications
Country of publisher: Germany
LCC subjects: Science: Physics; Science: Chemistry
Website: http://www.atmospheric-chemistry-and-physics.net/

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