 |
| Titel |
Combined observational and modeling based study of the aerosol indirect effect |
| VerfasserIn |
T. Storelvmo, J. E. Kristjánsson, G. Myhre, M. Johnsrud, F. Stordal |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 11 ; Nr. 6, no. 11 (2006-09-04), S.3583-3601 |
| Datensatznummer |
250004074
|
| Publikation (Nr.) |
 copernicus.org/acp-6-3583-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| The indirect effect of aerosols via liquid clouds is
investigated by comparing aerosol and cloud characteristics from the Global
Climate Model CAM-Oslo to those observed by the MODIS instrument onboard the
TERRA and AQUA satellites http://modis.gsfc.nasa.gov). The comparison is
carried out for 15 selected regions ranging from remote and clean to densely
populated and polluted. For each region, the regression coefficient and
correlation coefficient for the following parameters are calculated: Aerosol
Optical Depth vs. Liquid Cloud Optical Thickness, Aerosol Optical Depth vs. Liquid
Cloud Droplet Effective Radius and Aerosol Optical Depth vs. Cloud
Liquid Water Path. Modeled and observed correlation coefficients and
regression coefficients are then compared for a 3-year period starting in
January 2001. Additionally, global maps for a number of aerosol and cloud
parameters crucial for the understanding of the aerosol indirect effect are
compared for the same period of time. Significant differences are found
between MODIS and CAM-Oslo both in the regional and global comparison.
However, both the model and the observations show a positive correlation
between Aerosol Optical Depth and Cloud Optical Depth in practically all
regions and for all seasons, in agreement with the current understanding of
aerosol-cloud interactions. The correlation between Aerosol Optical Depth
and Liquid Cloud Droplet Effective Radius is variable both in the model and
the observations. However, the model reports the expected negative
correlation more often than the MODIS data. Aerosol Optical Depth is overall
positively correlated to Cloud Liquid Water Path both in the model and the
observations, with a few regional exceptions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|