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Diesel soot aging in urban plumes within hours under cold dark and humid conditions

Eriksson, Axel LU ; Wittbom, Cerina LU ; Roldin, Pontus LU ; Sporre, Moa LU ; Öström, Emilie LU ; Nilsson, Patrik LU ; Martinsson, Johan LU ; Rissler, Jenny LU ; NORDIN, ERIK LU and Svenningsson, Birgitta LU , et al. (2017) In Scientific Reports
Abstract (Swedish)
Fresh and aged diesel soot particles have different impacts on climate and human health. While
fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical
and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in
the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show... (More)
Fresh and aged diesel soot particles have different impacts on climate and human health. While
fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical
and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in
the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake (Less)
Abstract
Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not... (More)
Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake. (Less)
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Scientific Reports
publisher
Nature Publishing Group
external identifiers
  • scopus:85030118935
  • wos:000411998800003
ISSN
2045-2322
DOI
10.1038/s41598-017-12433-0
language
English
LU publication?
yes
id
fa9483d2-ab6a-4e02-9f2f-c9cdbe824e12
date added to LUP
2017-10-09 13:47:45
date last changed
2018-01-16 13:21:58
@article{fa9483d2-ab6a-4e02-9f2f-c9cdbe824e12,
  abstract     = {Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake.},
  articleno    = {12364},
  author       = {Eriksson, Axel and Wittbom, Cerina and Roldin, Pontus and Sporre, Moa and Öström, Emilie and Nilsson, Patrik and Martinsson, Johan and Rissler, Jenny and NORDIN, ERIK and Svenningsson, Birgitta and Pagels, Joakim and Swietlicki, Erik},
  issn         = {2045-2322},
  language     = {eng},
  month        = {09},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Diesel soot aging in urban plumes within hours under cold dark and humid conditions},
  url          = {http://dx.doi.org/10.1038/s41598-017-12433-0},
  year         = {2017},
}