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Anthropogenic aerosol effects on convective cloud microphysical properties in southern Sweden

Freud, E; Ström, J; Rosenfeld, D; Tunved, P and Swietlicki, Erik LU (2008) In Tellus. Series B: Chemical and Physical Meteorology 60(2). p.286-297
Abstract
In this study, we look for anthropogenic aerosol effects in southern Scandinavia's clouds under the influence of moderate levels of pollution and relatively weak dynamic forcing. This was done by comparing surface aerosol measurements with convective cloud microphysical profiles produced from satellite image analyses. The results show that the clouds associated with the anthropogenic-affected air with high PM0.5, had to acquire a vertical development of similar to 3.5 km before forming precipitation-sized particles, compared to less than 1 km for the clouds associated with low PM0.5 air-masses. Additionally, a comparison of profiles with precipitation was done with regard to different potentially important parameters. For precipitating... (More)
In this study, we look for anthropogenic aerosol effects in southern Scandinavia's clouds under the influence of moderate levels of pollution and relatively weak dynamic forcing. This was done by comparing surface aerosol measurements with convective cloud microphysical profiles produced from satellite image analyses. The results show that the clouds associated with the anthropogenic-affected air with high PM0.5, had to acquire a vertical development of similar to 3.5 km before forming precipitation-sized particles, compared to less than 1 km for the clouds associated with low PM0.5 air-masses. Additionally, a comparison of profiles with precipitation was done with regard to different potentially important parameters. For precipitating clouds the variability of the cloud thickness needed to produce the precipitation (Delta h(14)) is directly related to PM0.5 concentrations, even without considering atmospheric stability, the specific aerosol size distribution or the aerosols' chemical composition. Each additional 1 mu g m(-3) of PM0.5 was found to increase Delta h(14) by similar to 200-250 m. Our conclusion is that it is indeed possible to detect the effects of anthropogenic aerosol on the convective clouds in southern Scandinavia despite modest aerosol masses. It also emphasizes the importance of including aerosol processes in climate-radiation models and in numerical weather prediction models. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Tellus. Series B: Chemical and Physical Meteorology
volume
60
issue
2
pages
286 - 297
publisher
Taylor & Francis
external identifiers
  • wos:000254277200014
  • scopus:41549123210
ISSN
0280-6509
DOI
10.1111/j.1600-0889.2007.00337.x
language
English
LU publication?
yes
id
58a05067-80c5-4e72-b1a2-e896fb0d8e06 (old id 1183141)
date added to LUP
2008-09-02 12:09:55
date last changed
2017-01-01 06:09:53
@article{58a05067-80c5-4e72-b1a2-e896fb0d8e06,
  abstract     = {In this study, we look for anthropogenic aerosol effects in southern Scandinavia's clouds under the influence of moderate levels of pollution and relatively weak dynamic forcing. This was done by comparing surface aerosol measurements with convective cloud microphysical profiles produced from satellite image analyses. The results show that the clouds associated with the anthropogenic-affected air with high PM0.5, had to acquire a vertical development of similar to 3.5 km before forming precipitation-sized particles, compared to less than 1 km for the clouds associated with low PM0.5 air-masses. Additionally, a comparison of profiles with precipitation was done with regard to different potentially important parameters. For precipitating clouds the variability of the cloud thickness needed to produce the precipitation (Delta h(14)) is directly related to PM0.5 concentrations, even without considering atmospheric stability, the specific aerosol size distribution or the aerosols' chemical composition. Each additional 1 mu g m(-3) of PM0.5 was found to increase Delta h(14) by similar to 200-250 m. Our conclusion is that it is indeed possible to detect the effects of anthropogenic aerosol on the convective clouds in southern Scandinavia despite modest aerosol masses. It also emphasizes the importance of including aerosol processes in climate-radiation models and in numerical weather prediction models.},
  author       = {Freud, E and Ström, J and Rosenfeld, D and Tunved, P and Swietlicki, Erik},
  issn         = {0280-6509},
  language     = {eng},
  number       = {2},
  pages        = {286--297},
  publisher    = {Taylor & Francis},
  series       = {Tellus. Series B: Chemical and Physical Meteorology},
  title        = {Anthropogenic aerosol effects on convective cloud microphysical properties in southern Sweden},
  url          = {http://dx.doi.org/10.1111/j.1600-0889.2007.00337.x},
  volume       = {60},
  year         = {2008},
}