Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model
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 th...
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ftcopernicus:oai:publications.copernicus.org:gmd12822 2023-05-15T13:06:23+02:00 Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model Mokhtari, M. Gomes, L. Tulet, P. Rezoug, T. 2018-09-27 application/pdf https://doi.org/10.5194/gmd-5-581-2012 https://gmd.copernicus.org/articles/5/581/2012/ eng eng doi:10.5194/gmd-5-581-2012 https://gmd.copernicus.org/articles/5/581/2012/ eISSN: 1991-9603 Text 2018 ftcopernicus https://doi.org/10.5194/gmd-5-581-2012 2020-07-20T16:25:49Z 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. Text Aerosol Robotic Network Copernicus Publications: E-Journals Geoscientific Model Development 5 3 581 598 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
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. |
format |
Text |
author |
Mokhtari, M. Gomes, L. Tulet, P. Rezoug, T. |
spellingShingle |
Mokhtari, M. Gomes, L. Tulet, P. Rezoug, T. Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
author_facet |
Mokhtari, M. Gomes, L. Tulet, P. Rezoug, T. |
author_sort |
Mokhtari, M. |
title |
Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
title_short |
Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
title_full |
Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
title_fullStr |
Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
title_full_unstemmed |
Importance of the surface size distribution of erodible material: an improvement on the Dust Entrainment And Deposition (DEAD) Model |
title_sort |
importance of the surface size distribution of erodible material: an improvement on the dust entrainment and deposition (dead) model |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-5-581-2012 https://gmd.copernicus.org/articles/5/581/2012/ |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-5-581-2012 https://gmd.copernicus.org/articles/5/581/2012/ |
op_doi |
https://doi.org/10.5194/gmd-5-581-2012 |
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Geoscientific Model Development |
container_volume |
5 |
container_issue |
3 |
container_start_page |
581 |
op_container_end_page |
598 |
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1766003354623803392 |