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n-Alkanoic monocarboxylic acid concentrations in urban and rural aerosols: Seasonal dependence and major sources

Shannigrahi, Ardhendu S.; Pettersson, Jan B. C.; Langer, Sarka; Arrhenius, Karine; Hagstrom, Magnus; Janhall, Sara; Hallquist, Mattias and Pathak, Ravi Kant (2014) In Atmospheric Research 143. p.228-237
Abstract
We report new data on the abundance and distribution of n-monocarboxylic acids (n-MCAs) in fine- and coarse-mode aerosols in rural and urban areas of Sweden, and determine their possible sources. Overall, C-6-C-16 n-MCAs accounted for similar to 0.5-1.2% of the total PM10 (particulate matter <= mu m) mass. In general, the C-12-C-16 fraction was the most abundant (>75%), with the exception of wintertime samples from a rural site, where C-6-C-11 acids accounted for 65% of the total C-6-C-16 n-MCA mass. Positive matrix factorization analysis revealed four major sources of n-MCAs: traffic emissions, wood combustion, microbial activity, and a fourth factor that was dominated by semi-volatile n-MCAs. Traffic emissions were important in the... (More)
We report new data on the abundance and distribution of n-monocarboxylic acids (n-MCAs) in fine- and coarse-mode aerosols in rural and urban areas of Sweden, and determine their possible sources. Overall, C-6-C-16 n-MCAs accounted for similar to 0.5-1.2% of the total PM10 (particulate matter <= mu m) mass. In general, the C-12-C-16 fraction was the most abundant (>75%), with the exception of wintertime samples from a rural site, where C-6-C-11 acids accounted for 65% of the total C-6-C-16 n-MCA mass. Positive matrix factorization analysis revealed four major sources of n-MCAs: traffic emissions, wood combustion, microbial activity, and a fourth factor that was dominated by semi-volatile n-MCAs. Traffic emissions were important in the urban environment in both seasons and at the rural site during winters, and were a major source of C-9-C-11 acids. Wood combustion was a significant source at urban sites during the winter and also to some extent at the rural site in both seasons. This is consistent with the use of wood for domestic heating but may also be related to meat cooking. Thus, during the winter, traffic, wood combustion and microbial activity were all important sources in the urban environment, while traffic was the dominant source at the rural site. During the summer, there was considerable day-to-day variation in n-MCA concentrations but microbial activity was the dominant source. The semi-volatile low molecular weight C-6-C-8 acids accounted for a small (similar to 5-10%) fraction of the total mass of n-MCAs. This factor is unlikely to be linked to a single source and its influence instead reflects the partitioning of these compounds between the gas and particle phases. This would explain their greater contribution during the winter. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
PMF, Alkanoic acids, Rural and urban PM, Microbial activity
in
Atmospheric Research
volume
143
pages
228 - 237
publisher
Elsevier
external identifiers
  • scopus:84896040079
ISSN
1873-2895
DOI
10.1016/j.atmosres.2014.01.020
project
MERGE
language
English
LU publication?
no
id
3f72e6ff-2f68-4f49-8aff-bd06293d0cf2 (old id 4863340)
date added to LUP
2014-12-15 14:54:43
date last changed
2017-08-06 03:19:40
@article{3f72e6ff-2f68-4f49-8aff-bd06293d0cf2,
  abstract     = {We report new data on the abundance and distribution of n-monocarboxylic acids (n-MCAs) in fine- and coarse-mode aerosols in rural and urban areas of Sweden, and determine their possible sources. Overall, C-6-C-16 n-MCAs accounted for similar to 0.5-1.2% of the total PM10 (particulate matter &lt;= mu m) mass. In general, the C-12-C-16 fraction was the most abundant (&gt;75%), with the exception of wintertime samples from a rural site, where C-6-C-11 acids accounted for 65% of the total C-6-C-16 n-MCA mass. Positive matrix factorization analysis revealed four major sources of n-MCAs: traffic emissions, wood combustion, microbial activity, and a fourth factor that was dominated by semi-volatile n-MCAs. Traffic emissions were important in the urban environment in both seasons and at the rural site during winters, and were a major source of C-9-C-11 acids. Wood combustion was a significant source at urban sites during the winter and also to some extent at the rural site in both seasons. This is consistent with the use of wood for domestic heating but may also be related to meat cooking. Thus, during the winter, traffic, wood combustion and microbial activity were all important sources in the urban environment, while traffic was the dominant source at the rural site. During the summer, there was considerable day-to-day variation in n-MCA concentrations but microbial activity was the dominant source. The semi-volatile low molecular weight C-6-C-8 acids accounted for a small (similar to 5-10%) fraction of the total mass of n-MCAs. This factor is unlikely to be linked to a single source and its influence instead reflects the partitioning of these compounds between the gas and particle phases. This would explain their greater contribution during the winter. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Shannigrahi, Ardhendu S. and Pettersson, Jan B. C. and Langer, Sarka and Arrhenius, Karine and Hagstrom, Magnus and Janhall, Sara and Hallquist, Mattias and Pathak, Ravi Kant},
  issn         = {1873-2895},
  keyword      = {PMF,Alkanoic acids,Rural and urban PM,Microbial activity},
  language     = {eng},
  pages        = {228--237},
  publisher    = {Elsevier},
  series       = {Atmospheric Research},
  title        = {n-Alkanoic monocarboxylic acid concentrations in urban and rural aerosols: Seasonal dependence and major sources},
  url          = {http://dx.doi.org/10.1016/j.atmosres.2014.01.020},
  volume       = {143},
  year         = {2014},
}