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Title: Contributions of biomass-burning, urban, and biogenic emissions to the concentrations and light-absorbing properties of particulate matter in central Amazonia during the dry season

Abstract

Urbanization and deforestation have important impacts on atmospheric particulate matter (PM) over Amazonia. This study presents observations and analysis of PM1 concentration, composition, and optical properties in central Amazonia during the dry season, focusing on the anthropogenic impacts. The primary study site was located 70 km downwind of Manaus, a city of over 2 million people in Brazil, as part of the GoAmazon2014/5 experiment. A high-resolution time-of-flight aerosol mass spectrometer (AMS) provided data on PM1 composition, and aethalometer measurements were used to derive the absorption coefficient babs,BrC of brown carbon (BrC) at 370 nm. Non-refractory PM1 mass concentrations averaged 12.2 µg m -3 at the primary study site, dominated by organics (83 %), followed by sulfate (11 %). A decrease in babs,BrC was observed as the mass concentration of nitrogen-containing organic compounds decreased and the organic PM1 O:C ratio increased, suggesting atmospheric bleaching of the BrC components. The organic PM1 was separated into six different classes by positive-matrix factorization (PMF), and the mass absorption efficiency Eabs associated with each factor was estimated through multivariate linear regression of babs,BrC on the factor loadings. The largest Eabs values were associated with urban (2.04±0.14 m2 g -1) and biomass-burning (0.82±0.04 to 1.50±0.07 m2more » g -1) sources. Together, these sources contributed at least 80 % of babs,BrC while accounting for 30 % to 40 % of the organic PM1 mass concentration. In addition, a comparison of organic PM1 composition between wet and dry seasons revealed that only part of the 9-fold increase in mass concentration between the seasons can be attributed to biomass burning. Biomass-burning factor loadings increased by 30-fold, elevating its relative contribution to organic PM1 from about 10 % in the wet season to 30 % in the dry season. However, most of the PM1 mass (>60 %) in both seasons was accounted for by biogenic secondary organic sources, which in turn showed an 8-fold seasonal increase in factor loadings. A combination of decreased wet deposition and increased emissions and oxidant concentrations, as well as a positive feedback on larger mass concentrations are thought to play a role in the observed increases. Furthermore, fuzzy c-means clustering identified three clusters, namely “baseline”, “event”, and “urban” to represent different pollution influences during the dry season. The baseline cluster, representing the dry season background, was associated with a mean mass concentration of 9±3 µg m -3. This concentration increased on average by 3 µg m -3 for both the urban and the event clusters. The event cluster, representing an increased influence of biomass burning and long-range transport of African volcanic emissions, was characterized by remarkably high sulfate concentrations. The urban cluster, representing the influence of Manaus emissions on top of the baseline, was characterized by an organic PM1 composition that differed from the other two clusters. The differences discussed suggest a shift in oxidation pathways as well as an accelerated oxidation cycle due to urban emissions, in agreement with findings for the wet season.« less

Authors:
; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ; ; ; ORCiD logo; ; ; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ; ORCiD logo; ORCiD logo;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1526775
Alternate Identifier(s):
OSTI ID: 1542099; OSTI ID: 1559997; OSTI ID: 1566765
Report Number(s):
BNL-212043-2019-JAAM; PNNL-SA-147396
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
SC0011115; AC05-76RL01830; ASR (grant no. SC0011115); SC0012704; SC0011105; SC0006680; SC0016559
Resource Type:
Published Article
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 19 Journal Issue: 12; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
Germany
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

de Sá, Suzane S., Rizzo, Luciana V., Palm, Brett B., Campuzano-Jost, Pedro, Day, Douglas A., Yee, Lindsay D., Wernis, Rebecca, Isaacman-VanWertz, Gabriel, Brito, Joel, Carbone, Samara, Liu, Yingjun J., Sedlacek, Arthur, Springston, Stephen, Goldstein, Allen H., Barbosa, Henrique M. J., Alexander, M. Lizabeth, Artaxo, Paulo, Jimenez, Jose L., and Martin, Scot T. Contributions of biomass-burning, urban, and biogenic emissions to the concentrations and light-absorbing properties of particulate matter in central Amazonia during the dry season. Germany: N. p., 2019. Web. doi:10.5194/acp-19-7973-2019.
de Sá, Suzane S., Rizzo, Luciana V., Palm, Brett B., Campuzano-Jost, Pedro, Day, Douglas A., Yee, Lindsay D., Wernis, Rebecca, Isaacman-VanWertz, Gabriel, Brito, Joel, Carbone, Samara, Liu, Yingjun J., Sedlacek, Arthur, Springston, Stephen, Goldstein, Allen H., Barbosa, Henrique M. J., Alexander, M. Lizabeth, Artaxo, Paulo, Jimenez, Jose L., & Martin, Scot T. Contributions of biomass-burning, urban, and biogenic emissions to the concentrations and light-absorbing properties of particulate matter in central Amazonia during the dry season. Germany. doi:10.5194/acp-19-7973-2019.
de Sá, Suzane S., Rizzo, Luciana V., Palm, Brett B., Campuzano-Jost, Pedro, Day, Douglas A., Yee, Lindsay D., Wernis, Rebecca, Isaacman-VanWertz, Gabriel, Brito, Joel, Carbone, Samara, Liu, Yingjun J., Sedlacek, Arthur, Springston, Stephen, Goldstein, Allen H., Barbosa, Henrique M. J., Alexander, M. Lizabeth, Artaxo, Paulo, Jimenez, Jose L., and Martin, Scot T. Tue . "Contributions of biomass-burning, urban, and biogenic emissions to the concentrations and light-absorbing properties of particulate matter in central Amazonia during the dry season". Germany. doi:10.5194/acp-19-7973-2019.
@article{osti_1526775,
title = {Contributions of biomass-burning, urban, and biogenic emissions to the concentrations and light-absorbing properties of particulate matter in central Amazonia during the dry season},
author = {de Sá, Suzane S. and Rizzo, Luciana V. and Palm, Brett B. and Campuzano-Jost, Pedro and Day, Douglas A. and Yee, Lindsay D. and Wernis, Rebecca and Isaacman-VanWertz, Gabriel and Brito, Joel and Carbone, Samara and Liu, Yingjun J. and Sedlacek, Arthur and Springston, Stephen and Goldstein, Allen H. and Barbosa, Henrique M. J. and Alexander, M. Lizabeth and Artaxo, Paulo and Jimenez, Jose L. and Martin, Scot T.},
abstractNote = {Urbanization and deforestation have important impacts on atmospheric particulate matter (PM) over Amazonia. This study presents observations and analysis of PM1 concentration, composition, and optical properties in central Amazonia during the dry season, focusing on the anthropogenic impacts. The primary study site was located 70 km downwind of Manaus, a city of over 2 million people in Brazil, as part of the GoAmazon2014/5 experiment. A high-resolution time-of-flight aerosol mass spectrometer (AMS) provided data on PM1 composition, and aethalometer measurements were used to derive the absorption coefficient babs,BrC of brown carbon (BrC) at 370 nm. Non-refractory PM1 mass concentrations averaged 12.2 µg m-3 at the primary study site, dominated by organics (83 %), followed by sulfate (11 %). A decrease in babs,BrC was observed as the mass concentration of nitrogen-containing organic compounds decreased and the organic PM1 O:C ratio increased, suggesting atmospheric bleaching of the BrC components. The organic PM1 was separated into six different classes by positive-matrix factorization (PMF), and the mass absorption efficiency Eabs associated with each factor was estimated through multivariate linear regression of babs,BrC on the factor loadings. The largest Eabs values were associated with urban (2.04±0.14 m2 g-1) and biomass-burning (0.82±0.04 to 1.50±0.07 m2 g-1) sources. Together, these sources contributed at least 80 % of babs,BrC while accounting for 30 % to 40 % of the organic PM1 mass concentration. In addition, a comparison of organic PM1 composition between wet and dry seasons revealed that only part of the 9-fold increase in mass concentration between the seasons can be attributed to biomass burning. Biomass-burning factor loadings increased by 30-fold, elevating its relative contribution to organic PM1 from about 10 % in the wet season to 30 % in the dry season. However, most of the PM1 mass (>60 %) in both seasons was accounted for by biogenic secondary organic sources, which in turn showed an 8-fold seasonal increase in factor loadings. A combination of decreased wet deposition and increased emissions and oxidant concentrations, as well as a positive feedback on larger mass concentrations are thought to play a role in the observed increases. Furthermore, fuzzy c-means clustering identified three clusters, namely “baseline”, “event”, and “urban” to represent different pollution influences during the dry season. The baseline cluster, representing the dry season background, was associated with a mean mass concentration of 9±3 µg m-3. This concentration increased on average by 3 µg m-3 for both the urban and the event clusters. The event cluster, representing an increased influence of biomass burning and long-range transport of African volcanic emissions, was characterized by remarkably high sulfate concentrations. The urban cluster, representing the influence of Manaus emissions on top of the baseline, was characterized by an organic PM1 composition that differed from the other two clusters. The differences discussed suggest a shift in oxidation pathways as well as an accelerated oxidation cycle due to urban emissions, in agreement with findings for the wet season.},
doi = {10.5194/acp-19-7973-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 12,
volume = 19,
place = {Germany},
year = {2019},
month = {6}
}

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DOI: 10.5194/acp-19-7973-2019

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