Variability of Aerosol Optical Depth and Altitude for Key Aerosol Types over Southern West Africa via CALIPSO/CALIOP Observations-Reference-Cited by-同舟云学术

Variability of Aerosol Optical Depth and Altitude for Key Aerosol Types over Southern West Africa via CALIPSO/CALIOP Observations

Published:2024-03-23 Issue:4 Volume:15 Page:396
ISSN:2073-4433
Container-title:Atmosphere
language:en
Short-container-title:Atmosphere

Author:

Niamien Adou F.¹²,Léon Jean-François³^ORCID,Adon Marcellin¹²^ORCID,Rajot Jean-Louis⁴⁵⁶^ORCID,Feron Anaïs⁵,Yoboué Véronique²

Affiliation:

1. Laboratoire des Sciences et Technologie de l’Environnement, Université Jean Lorougnon Guede, Daloa P.O. Box 150, Côte d’Ivoire

2. Laboratoire des Sciences de la Matière, de l’Environnement et de l’Energie Solaire, Université Félix Houphouet Boigny, Abidjan P.O. Box 582, Côte d’Ivoire

3. Laboratoire d’Aérologie, Université de Toulouse, CNRS, IRD, 31400 Toulouse, France

4. Institute of Ecology and Environmental Sciences (iEES-Paris) Paris, UMR IRD 242, Univ Paris Est Créteil, Sorbonne Université, CNRS, INRA, Université de Paris, F-93143 Bondy, France

5. Université de Paris-Cité and Univ Paris Est Créteil, CNRS, LISA, F-75013 Paris, France

6. LMI IESOL, Centre IRD-ISRA de Bel Air, Dakar P.O. Box 1386, Senegal

Abstract

The atmosphere of southern West Africa (SWA) is one of the world’s most aerosol-laden regions. This study investigated the seasonal variability of aerosol optical thickness using photometric and CALIPSO/CALIOP observations. The mean daily aerosol optical thickness (AOD) at 550 nm over the 11 AERONET stations in SWA ranged from 0.35 in the Sahel area to 0.49 in the Guinea coast area and a maximum of 0.53 observed in the Savanna area. The AERONET and CALIOP observations reveal a seasonal variability of AOD that is comparable across all sub-regions studied. The seasonal variation of the AOD spectral dependency was related to the change in the occurrence of the CALIOP-derived aerosol types, and in particular to the contribution of dust to the AOD. We also observed a north–south gradient of 2 km in the mean extinction height of the dust layer, being at 4 km and 6 km high in the Sahel and Guinea areas, respectively. This gradient is attributed to the northward migration of the monsoon flow.

Funder

European Union

French Embassy

Publisher

MDPI AG

Link

https://www.mdpi.com/2073-4433/15/4/396/pdf

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