 |
| Titel |
Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
| VerfasserIn |
M. Mokhtari, L. Gomes, P. Tulet, T. Rezoug |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 3 ; Nr. 5, no. 3 (2012-05-03), S.581-598 |
| Datensatznummer |
250002607
|
| Publikation (Nr.) |
 copernicus.org/gmd-5-581-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper is based on dust aerosol cycle modelling in the atmospheric model
ALADIN (Aire Limitée Adaptation dynamique Développement
InterNational) coupled with the EXternalised SURFace scheme SURFEX. Its main
goal is to create an appropriate mineral dust emission parameterization
compatible with the global database of land surface parameters ECOCLIMAP,
and the Food and Agriculture Organization (FAO) soil type database in
SURFEX. An improvement on the Dust Entrainment And Deposition scheme (DEAD)
is proposed in this paper by introducing the geographical variation of
surface soil size distribution, the Marticorena and Bergametti (1995)
formulation of horizontal saltation flux and the Shao et al. (1996)
formulation of sandblasting efficiency α. To show the importance of the
modifications introduced in the DEAD, both sensitivity and comparative
studies are conducted in 0 dimensions (0-D) and then in 3 dimensions (3-D)
between the old DEAD and the new DEAD. The results of the 0-D simulations
indicate that the revised DEAD scheme represents the dust source emission
better, particularly in the Bodélé depression, and provides a
reasonable friction threshold velocity. In 3-D simulations, small
differences are found between the DEAD and the revised DEAD for the
simulated Aerosol Optical Depth (AOD) compared with the AErosol RObotic
NETwork (AERONET) photometer measurements available in the African Monsoon
Multidisciplinary Analyses (AMMA) databases. For the surface concentration,
a remarkable improvement is noted for the revised DEAD scheme. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|