Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment.
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4455765
- author
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Environmental Science & Technology
- volume
- 48
- issue
- 11
- pages
- 6300 - 6308
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:24798545
- wos:000336952000030
- scopus:84901925165
- pmid:24798545
- ISSN
- 1520-5851
- DOI
- 10.1021/es5000353
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Ergonomics and Aerosol Technology (011025002), Nuclear Physics (Faculty of Technology) (011013007), Solid State Physics (011013006)
- id
- 9936aeb5-d42a-4b5e-b0b7-8fa22621ec00 (old id 4455765)
- date added to LUP
- 2016-04-01 10:00:28
- date last changed
- 2022-03-12 01:09:44
@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 (ACS)}}, series = {{Environmental Science & Technology}}, title = {{Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment.}}, url = {{https://lup.lub.lu.se/search/files/1475258/5052040.pdf}}, doi = {{10.1021/es5000353}}, volume = {{48}}, year = {{2014}}, }