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Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment.

Rissler, Jenny LU ; Nordin, Erik LU ; Eriksson, Axel LU ; Nilsson, Patrik LU ; Frosch, Mia LU ; Sporre, Moa LU ; Wierzbicka, Aneta LU ; Svenningsson, Birgitta LU ; Löndahl, Jakob LU and Messing, Maria LU , et al. (2014) In Environmental Science & Technology 48(11). p.6300-6308
Abstract
In urban environments, airborne particles are continuously emitted, followed by atmospheric aging. Also, particles emitted elsewhere, transported by winds, contribute to the urban aerosol. We studied the effective density (mass-mobility relationship) and mixing state with respect to the density of particles in central Copenhagen, in wintertime. The results are related to particle origin, morphology, and aging. Using a differential mobility analyzer-aerosol particle mass analyzer (DMA-APM), we determined that particles in the diameter range of 50-400 nm were of two groups: porous soot aggregates and more dense particles. Both groups were present at each size in varying proportions. Two types of temporal variability in the relative number... (More)
In urban environments, airborne particles are continuously emitted, followed by atmospheric aging. Also, particles emitted elsewhere, transported by winds, contribute to the urban aerosol. We studied the effective density (mass-mobility relationship) and mixing state with respect to the density of particles in central Copenhagen, in wintertime. The results are related to particle origin, morphology, and aging. Using a differential mobility analyzer-aerosol particle mass analyzer (DMA-APM), we determined that particles in the diameter range of 50-400 nm were of two groups: porous soot aggregates and more dense particles. Both groups were present at each size in varying proportions. Two types of temporal variability in the relative number fraction of the two groups were found: soot correlated with intense traffic in a diel pattern and dense particles increased during episodes with long-range transport from polluted continental areas. The effective density of each group was relatively stable over time, especially of the soot aggregates, which had effective densities similar to those observed in laboratory studies of fresh diesel exhaust emissions. When heated to 300 °C, the soot aggregate volatile mass fraction was ∼10%. For the dense particles, the volatile mass fraction varied from ∼80% to nearly 100%. (Less)
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Contribution to journal
publication status
published
subject
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Environmental Science & Technology
volume
48
issue
11
pages
6300 - 6308
publisher
The American Chemical Society
external identifiers
  • pmid:24798545
  • wos:000336952000030
  • scopus:84901925165
ISSN
1520-5851
DOI
10.1021/es5000353
project
MERGE
language
English
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yes
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9936aeb5-d42a-4b5e-b0b7-8fa22621ec00 (old id 4455765)
date added to LUP
2014-06-08 11:02:38
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2017-10-08 03:04:02
@article{9936aeb5-d42a-4b5e-b0b7-8fa22621ec00,
  abstract     = {In urban environments, airborne particles are continuously emitted, followed by atmospheric aging. Also, particles emitted elsewhere, transported by winds, contribute to the urban aerosol. We studied the effective density (mass-mobility relationship) and mixing state with respect to the density of particles in central Copenhagen, in wintertime. The results are related to particle origin, morphology, and aging. Using a differential mobility analyzer-aerosol particle mass analyzer (DMA-APM), we determined that particles in the diameter range of 50-400 nm were of two groups: porous soot aggregates and more dense particles. Both groups were present at each size in varying proportions. Two types of temporal variability in the relative number fraction of the two groups were found: soot correlated with intense traffic in a diel pattern and dense particles increased during episodes with long-range transport from polluted continental areas. The effective density of each group was relatively stable over time, especially of the soot aggregates, which had effective densities similar to those observed in laboratory studies of fresh diesel exhaust emissions. When heated to 300 °C, the soot aggregate volatile mass fraction was ∼10%. For the dense particles, the volatile mass fraction varied from ∼80% to nearly 100%.},
  author       = {Rissler, Jenny and Nordin, Erik and Eriksson, Axel and Nilsson, Patrik and Frosch, Mia and Sporre, Moa and Wierzbicka, Aneta and Svenningsson, Birgitta and Löndahl, Jakob and Messing, Maria and Sjögren, Staffan and Hemmingsen, Jette G and Loft, Steffen and Pagels, Joakim and Swietlicki, Erik},
  issn         = {1520-5851},
  language     = {eng},
  number       = {11},
  pages        = {6300--6308},
  publisher    = {The American Chemical Society},
  series       = {Environmental Science & Technology},
  title        = {Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment.},
  url          = {http://dx.doi.org/10.1021/es5000353},
  volume       = {48},
  year         = {2014},
}