TITLE:
Contribution of Satellite Observations in the Optical and Microphysical Characterization of Aerosols in Burkina Faso, West Africa
AUTHORS:
Nébon Bado, Serge Dimitri Bazyomo, Germain Wende Pouiré Ouedraogo, Bruno Korgo, Mamadou Simina Dramé, Florent P. Kieno, Sié Kam
KEYWORDS:
AERONET, Airborne Sensors, Aerosol, Optical and Microphysical Properties
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.14 No.1,
January
31,
2024
ABSTRACT: In this work, we proceed to an optical and microphysical
analysis of the observations reversed by the MODIS, SeaWiFS, MISR and OMI
sensors with the aim of proposing the best-adapted airborne sensor for better
monitoring of aerosols in Burkina Faso. To this end, a comparison of AOD
between satellite observations and in situ measurements at the Ouagadougou site
reveals an underestimation of AERONET AOD except for OMI which overestimates
them. Also, an inter-comparison done based on the linear regression line
representation shows the correlation between the aerosol models incorporated in
the airborne sensor inversion algorithms and the aerosol population probed.
This can be seen through the correlation coefficients R which are 0.84, 0.64,
0.55 and 0.054 for MODIS, SeaWiFS, MISR and OMI respectively. Furthermore, an
optical analysis of aerosols in Burkina Faso by the MODIS sensor from 2001 to
2016 indicates a large spatial and temporal variability of particles strongly
dominated by desert dust. This is corroborated by the annual and seasonal
cycles of the AOD at 550 nm and the Angström coefficient measured in the
spectral range between 412 nm and 470 nm. A zoom on a few sites chosen
according to the three climatic zones confirms the majority presence of mineral
aerosols in Burkina Faso, whose maxima are observed in spring and summer.