 |
| Titel |
Constraining the total aerosol indirect effect in the LMDZ and ECHAM4 GCMs using MODIS satellite data |
| VerfasserIn |
J. Quaas, O. Boucher, U. Lohmann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 4 ; Nr. 6, no. 4 (2006-03-27), S.947-955 |
| Datensatznummer |
250003623
|
| Publikation (Nr.) |
 copernicus.org/acp-6-947-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| Aerosol indirect effects are considered to be the most uncertain yet
important anthropogenic forcing of climate change. The goal of the present
study is to reduce this uncertainty by constraining two different general
circulation models (LMDZ and ECHAM4) with satellite data. We build a
statistical relationship between cloud droplet number concentration and the
optical depth of the fine aerosol mode as a measure of the aerosol indirect
effect using MODerate Resolution Imaging Spectroradiometer (MODIS) satellite
data, and constrain the model parameterizations to match this relationship.
We include here "empirical" formulations for the cloud albedo effect as
well as parameterizations of the cloud lifetime effect. When fitting the
model parameterizations to the satellite data, consistently in both models,
the radiative forcing by the combined aerosol indirect effect is reduced
considerably, down to
−0.5 and −0.3 Wm−2, for LMDZ and ECHAM4, respectively. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|