Impact of biomass burning on pollutant surface concentrations in megacities of the Gulf of Guinea

In the framework of the Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) project, the tropospheric chemical composition in large cities along the Gulf of Guinea is studied using the Weather and Research Forecast and CHIMERE regional models. Simulations are performed for the May...

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Vydáno v:Atmospheric chemistry and physics Ročník 18; číslo 4; s. 2687 - 2707
Hlavní autoři: Menut, Laurent, Flamant, Cyrille, Turquety, Solène, Deroubaix, Adrien, Chazette, Patrick, Meynadier, Rémi
Médium: Journal Article
Jazyk:angličtina
Vydáno: Katlenburg-Lindau Copernicus GmbH 23.02.2018
Copernicus Publications
Témata:
Aerosol-cloud interactions
Aerosols
Air pollution
Biomass
Biomass burning
Boundary layers
Burning
Chemical composition
Cities
Cloud-climate relationships
Coastal environments
Computer simulation
Dynamics
Emissions
Emissions (Pollution)
Environmental aspects
Environmental impact
Fires
Forecasts and trends
Frameworks
Interactions
Megacities
Metropolitan areas
Mixed layer
Organic chemistry
Organic matter
Particulate matter
Pollutants
Satellite data
Satellites
Tracers
Weather forecasting
Guinea
Central Africa
Gulf of Guinea
ISSN:1680-7324, 1680-7316, 1680-7324
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Shrnutí:In the framework of the Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) project, the tropospheric chemical composition in large cities along the Gulf of Guinea is studied using the Weather and Research Forecast and CHIMERE regional models. Simulations are performed for the May–July 2014 period, without and with biomass burning emissions. Model results are compared to satellite data and surface measurements. Using numerical tracer release experiments, it is shown that the biomass burning emissions in Central Africa are impacting the surface aerosol and gaseous species concentrations in Gulf of Guinea cities such as Lagos (Nigeria) and Abidjan (Ivory Coast). Depending on the altitude of the injection of these emissions, the pollutants follow different pathways: directly along the coast or over land towards the Sahel before being vertically mixed in the convective boundary layer and transported to the south-west and over the cities. In July 2014, the maximum increase in surface concentrations due to fires in Central Africa is ≈ 150 µg m−3 for CO, ≈ 10 to 20 µg m−3 for O3 and ≈ 5 µg m−3 for PM10. The analysis of the PM10 chemical composition shows that this increase is mainly related to an increase in particulate primary and organic matter.
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ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-18-2687-2018