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Title: Anthropogenic influences on the physical state of submicron particulate matter over a tropical forest

Journal Article · · Atmospheric Chemistry and Physics (Online)
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  1. Harvard Univ., Cambridge, MA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Xiamen Univ. (China)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. Univ. of Colorado, Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences (CIRES)
  7. National Inst. of Amazonian Research, Manaus (Brazil)
  8. Meteorological Research Inst. (MRI), Tsukuba (Japan)
  9. Univ. of Sao Paulo (Brazil)
  10. Univ. of British Columbia, Vancouver, BC (Canada)
  11. Arizona State Univ., Tempe, AZ (United States)
  12. Amazonas State Univ., Manaus (Brazil)

The occurrence of nonliquid and liquid physical states of submicron atmospheric particulate matter (PM) downwind of an urban region in central Amazonia was investigated. Measurements were conducted during two intensive operating periods (IOP1 and IOP2) that took place during the wet and dry seasons of the GoAmazon2014/5 campaign. Air masses representing variable influences of background conditions, urban pollution, and regional- and continental-scale biomass burning passed over the research site. As the air masses varied, particle rebound fraction, an indicator of physical state, was measured in real time at ground level using an impactor apparatus. Micrographs collected by transmission electron microscopy confirmed that liquid particles adhered, while nonliquid particles rebounded. Relative humidity (RH) was scanned to collect rebound curves. When the apparatus RH matched ambient RH, 95 % of the particles adhered as a campaign average. Secondary organic material, produced for the most part by the oxidation of volatile organic compounds emitted from the forest, produces liquid PM over this tropical forest. During periods of anthropogenic influence, by comparison, the rebound fraction dropped to as low as 60 % at 95 % RH. Analyses of the mass spectra of the atmospheric PM by positive-matrix factorization (PMF) and of concentrations of carbon monoxide, total particle number, and oxides of nitrogen were used to identify time periods affected by anthropogenic influences, including both urban pollution and biomass burning. The occurrence of nonliquid PM at high RH correlated with these indicators of anthropogenic influence. A linear model having as output the rebound fraction and as input the PMF factor loadings explained up to 70 % of the variance in the observed rebound fractions. Anthropogenic influences can contribute to the presence of nonliquid PM in the atmospheric particle population through the combined effects of molecular species that increase viscosity when internally mixed with background PM and increased concentrations of nonliquid anthropogenic particles in external mixtures of anthropogenic and biogenic PM.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830
OSTI ID:
1379723
Alternate ID(s):
OSTI ID: 1344029
Report Number(s):
PNNL-SA-119055; ark:/13030/qt4j84c3dt
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 17, Issue 3; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (11)

Physical Properties of Aerosol Internally Mixed With Soot Particles in a Biogenically Dominated Environment in California journal October 2018
The viscosity of atmospherically relevant organic particles journal March 2018
Mechanism of SOA formation determines magnitude of radiative effects journal November 2017
Volume changes upon heating of aerosol particles from biomass burning using transmission electron microscopy journal September 2017
Forests, atmospheric water and an uncertain future: the new biology of the global water cycle journal March 2018
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
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
Constraining nucleation, condensation, and chemistry in oxidation flow reactors using size-distribution measurements and aerosol microphysical modeling journal January 2018
Single-particle characterization of aerosols collected at a remote site in the Amazonian rainforest and an urban site in Manaus, Brazil journal January 2019
Viscosity of erythritol and erythritol–water particles as a function of water activity: new results and an intercomparison of techniques for measuring the viscosity of particles journal January 2018
Urban influence on the concentration and composition of submicron particulate matter in central Amazonia journal January 2018

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