European Facility For Airborne Research

European Facility For Airborne Research Aug. 17, 2017, 05:39

Document

Description
Title Anthropogenic aerosol effects on convective cloud microphysical properties in southern Sweden
Type Publication
Abstract:

n 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 PM 0.5 , had to acquire a vertical development of ∼3.5 km before forming precipitation-sized particles, compared to less than 1 km for the clouds associated with low PM 0.5 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 ( h 14 ) is directly related to PM 0.5 concentrations, even without considering atmospheric stability, the specific aerosol size distribution or the aerosols’ chemical composition. Each additional 1 μg m −3 of PM 0.5 was found to increase h 14 by ∼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.

Available from http://www.tellusb.net/index.php/tellusb/article/view/16922/0
Author
FREUD Eyal
ROSENFELD Daniel
J. Ström, P. Tunved, E. Swietlicki
Reference
Journal Tellus B
Volume 60
Pages 286-297
Year 2008
Times cited None
Institute country Israel
Type of science
  • Aerosol chemistry and physics
  • Atmospheric dynamics (includes thermodynamics)
  • Pollution (includes air, sea and soil)
  • Precipitation
Field of science
  • Troposphere
File details
Added April 22, 2016, 10:59
Last update May 9, 2016, 11:07
Size 518.1 KB
File name None
Visibility Public
Links with specific subjects

Go to the document list

Back to top
EUFAR
EU

This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 312609

Copyright © 2017 EUFAR All rights reserved.