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Influence of urban pollution on the production of organic particulate matter from isoprene epoxydiols in central Amazonia

Journal Article · · Atmospheric Chemistry and Physics (Online)
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  1. Harvard Univ., Cambridge, MA (United States)
  2. Univ. of Colorado, Boulder, CO (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Univ. of California, Berkeley, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
  7. Univ. de Sao Paulo, Sao Paulo (Brazil); Univ. Blaise Pascal, Aubiere (France)
  8. Univ. de Sao Paulo, Sao Paulo (Brazil)
  9. Instituto Nacional de Pesquisas da Amazonia, Amazonas (Brazil)
  10. Univ. do Estado do Amazonas, Amazonas (Brazil)
  11. The Univ. of North Carolina, Chapel Hill, NC (United States)
The atmospheric chemistry of isoprene contributes to the production of a substantial mass fraction of the particulate matter (PM) over tropical forests. Isoprene epoxydiols (IEPOX) produced in the gas phase by the oxidation of isoprene under HO2-dominant conditions are subsequently taken up by particles, thereby leading to production of secondary organic PM. The present study investigates possible perturbations to this pathway by urban pollution. The measurement site in central Amazonia was located 4 to 6 h downwind of Manaus, Brazil. Measurements took place from February through March 2014 of the wet season, as part of the GoAmazon2014/5 experiment. Mass spectra of organic PM collected with an Aerodyne Aerosol Mass Spectrometer were analyzed by positive-matrix factorization. One resolved statistical factor ("IEPOX-SOA factor") was associated with PM production by the IEPOX pathway. The IEPOX-SOA factor loadings correlated with independently measured mass concentrations of tracers of IEPOX-derived PM, namely C5-alkene triols and 2-methyltetrols (R = 0.96 and 0.78, respectively). The factor loading, as well as the ratio f of the loading to organic PM mass concentration, decreased under polluted compared to background conditions. For an increase in NOy concentration from 0.5 to 2 ppb, the factor loading and f decreased by two to three fold. Overall, sulfate concentration explained 37 % of the variability in the factor loading. After segregation of factor loading into subsets based on NOy concentration, the sulfate concentration explained up to 75 % of the variability. Considering both factors, the data sets show that the suppressing effects of increased NO concentrations dominated over the enhancing effects of higher sulfate concentrations. Furthermore, the pollution from Manaus elevated NOy concentrations more significantly than sulfate concentrations relative to background conditions. In this light, increased emissions of nitrogen oxides, as anticipated for some scenarios of Amazonian economic development, could significantly alter pathways of PM production that presently prevail over the tropical forest, implying changes to air quality and regional climate.
Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1363989
Report Number(s):
PNNL-SA--125341; KP1701000
Journal Information:
Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Journal Issue: 11 Vol. 17; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (27)

Isoprene photo-oxidation products quantify the effect of pollution on hydroxyl radicals over Amazonia journal April 2018
Elemental Mixing State of Aerosol Particles Collected in Central Amazonia during GoAmazon2014/15 journal September 2017
African volcanic emissions influencing atmospheric aerosols over the Amazon rain forest journal January 2018
Ground-based observation of clusters and nucleation-mode particles in the Amazon journal January 2018
Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region journal January 2018
Chemical composition of ultrafine aerosol particles in central Amazonia during the wet season journal January 2019
Mixing states of Amazon basin aerosol particles transported over long distances using transmission electron microscopy journal January 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 journal May 2020
Limited formation of isoprene epoxydiols-derived secondary organic aerosol under NO x -rich environments in Eastern China : LIMITED FORMATION OF IEPOX-SOA journal January 2017
Regional Similarities and NO x ‐Related Increases in Biogenic Secondary Organic Aerosol in Summertime Southeastern United States journal September 2018
Urban pollution greatly enhances formation of natural aerosols over the Amazon rainforest journal March 2019
Development of a hydrophilic interaction liquid chromatography (HILIC) method for the chemical characterization of water-soluble isoprene epoxydiol (IEPOX)-derived secondary organic aerosol journal January 2018
Organosulfates in aerosols downwind of an urban region in central Amazon journal January 2018
Evaluation of the new capture vaporizer for aerosol mass spectrometers (AMS) through field studies of inorganic species journal February 2017
CCN activity and organic hygroscopicity of aerosols downwind of an urban region in central Amazonia: seasonal and diel variations and impact of anthropogenic emissions journal January 2017
Anthropogenic influences on the physical state of submicron particulate matter over a tropical forest journal January 2017
Contributions of mobile, stationary and biogenic sources to air pollution in the Amazon rainforest: a numerical study with the WRF-Chem model journal January 2017
Multi-year statistical and modeling analysis of submicrometer aerosol number size distributions at a rain forest site in Amazonia journal January 2018
Observations of sesquiterpenes and their oxidation products in central Amazonia during the wet and dry seasons journal January 2018
Aircraft observations of the chemical composition and aging of aerosol in the Manaus urban plume during GoAmazon 2014/5 journal January 2018
Urban influence on the concentration and composition of submicron particulate matter in central Amazonia journal January 2018
Secondary organic aerosol formation from ambient air in an oxidation flow reactor in central Amazonia journal January 2018
Assessing the role of anthropogenic and biogenic sources on PM1 over southern West Africa using aircraft measurements journal January 2018
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 journal January 2019
Assessing the role of anthropogenic and biogenic sources on PM₁ over southern West Africa using aircraft measurements text January 2018
Evaluation of the new capture vaporizer for aerosol mass spectrometers (AMS) through field studies of inorganic species text January 2017
Evaluation of the new capture vaporizer for aerosol mass spectrometers (AMS) through field studies of inorganic species text January 2017

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