The use of ALADIN model and MERRA-2 reanalysis to represent dust seasonal dry deposition from 2006 to 2010 in Senegal, West Africa
The objective of this work is to study the seasonal distribution of dust dry deposition in West Africa particularly in Senegal. This initiative is part of the efforts to improve the performance of photovoltaic panels (PV) in dusty environments such as Sahel region. It will help to evaluate the impact of dust dry deposition on these PV. Two climate models including dust modules during 2006–2010, were used: MERRA-2 (Modern-Era Retrospective Analysis for Research and Applications, version 2) reanalysis and ALADIN (Aire Limitée Adaptation dynamique Développement InterNational) model. In Mbour (Senegal), the aerosol optical depth (AOD) from these two products has been validated by in situ data. Indeed, MERRA-2 and ALADIN fairly simulate the AOD with a maximum in March and June. However, these products tend to overestimate measurements, especially for ALADIN. The correlation coefficient between in situ AOD and products is evaluate almost 0.83 for MERRA-2 and 0.72 for ALADIN. From 2007 to 2009, dust deposition measurement campaign was conducted in Mbour. The comparison between these seasonal data and simulations show a right coherence even if MERRA-2 underestimates measurement and ALADIN overestimates it. The correlation compared to in situ measurements is estimate to 0.71 for MERRA-2 and 0.72 for ALADIN. However, the results showed that ALADIN better describes the seasonal dry deposition during dry season which lasts 9 months despite a strong overestimation in winter. Finally, long-term simulation with ALADIN show that dry deposition maximum occurs from December to May in Senegal and throughout the West Africa region.
KeywordsDust Deposition ALADIN AOD MERRA-2 Senegal
We thank Mohamed Mokhtari (Office National de la Météorologie, Algeria) for providing ALADIN simulations.
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