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Sensitivity of low-level clouds and precipitation to anthropogenic aerosol emission in southern West Africa: a DACCIWA case study

Deroubaix, Adrien and Menut, Laurent and Flamant, Cyrille and Knippertz, Peter and Fink, Andreas H. and Batenburg, Anneke M. and Brito, Joel and Denjean, Cyrielle and Dione, Cheikh and Dupuy, Régis and Hahn, Valerian and Kalthoff, Norbert and Lohou, Fabienne and Schwarzenboeck, Alfons and Siour, Guillaume and Tuccella, Paolo and Voigt, Christiane (2022) Sensitivity of low-level clouds and precipitation to anthropogenic aerosol emission in southern West Africa: a DACCIWA case study. Atmospheric Chemistry and Physics, 22 (5), pp. 3251-3273. Copernicus Publications. doi: 10.5194/acp-22-3251-2022. ISSN 1680-7316.

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Official URL: https://dx.doi.org/10.5194/acp-22-3251-2022


During the West African summer monsoon, pollutants emitted in urbanized coastal areas modify cloud cover and precipitation patterns. The Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) field campaign provided numerous aircraft-based and ground-based observations, which are used here to evaluate two experiments made with the coupled WRF–CHIMERE model, integrating both the direct and indirect aerosol effect on meteorology. During one well-documented week (1–7 July 2016), the impacts of anthropogenic aerosols on the diurnal cycle of low-level clouds and precipitation are analyzed in detail using high and moderate intensity of anthropogenic emissions in the experiments. Over the continent and close to major anthropogenic emission sources, the breakup time of low-level clouds is delayed by 1 hour, and the daily precipitation rate decreased by 7.5 % with the enhanced anthropogenic emission experiment (with high aerosol load). Despite the small modifications on daily average of low-level cloud cover (+2.6 %) with high aerosol load compared to moderate, there is an increase by more than 20 % from 14:00 to 22:00 UTC on hourly average. Moreover, modifications of the modeled low-level cloud and precipitation rate occur far from the major anthropogenic emission sources, to the south over the ocean and to the north up to 11∘ N. The present study adds evidence to recent findings that enhanced pollution levels in West Africa may reduce precipitation.

Item URL in elib:https://elib.dlr.de/185862/
Document Type:Article
Title:Sensitivity of low-level clouds and precipitation to anthropogenic aerosol emission in southern West Africa: a DACCIWA case study
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Deroubaix, AdrienATMOS, École Polytechnique, Université Paris-Saclay, FrankreichUNSPECIFIED
Menut, LaurentATMOS, École Polytechnique, Université Paris-Saclay, FrankreichUNSPECIFIED
Flamant, CyrilleLATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, FranceUNSPECIFIED
Knippertz, PeterJohannes Gutenberg-Univ. Mainz, MainzUNSPECIFIED
Fink, Andreas H.KIT, KarlsruheUNSPECIFIED
Batenburg, Anneke M.Univ. Mainz und MPI für Chemie, Mainzhttps://orcid.org/0000-0002-3405-6593
Brito, JoelIMT Lille Douai, Université de Lille, SAGE, Lille, FranceUNSPECIFIED
Denjean, CyrielleCNRM, Météo-France, Toulouse, FrankreichUNSPECIFIED
Dione, CheikhACMAD, Niamey, NigerUNSPECIFIED
Dupuy, RégisUniv. Blaise Pascal, Aubière, FrankreichUNSPECIFIED
Kalthoff, NorbertKIT, KarlsruheUNSPECIFIED
Lohou, FabienneCNRS, UPS, Toulouse, FranceUNSPECIFIED
Schwarzenboeck, AlfonsACMAD, African Centre of Meteorological Applications for Development, Niamey, NigerUNSPECIFIED
Siour, GuillaumeLISA/IPSL, Créteil, FranceUNSPECIFIED
Tuccella, PaoloUniversity of L’Aquila, L’Aquila, ItalyUNSPECIFIED
Voigt, ChristianeDLR, IPAhttps://orcid.org/0000-0001-8925-7731
Date:11 March 2022
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/acp-22-3251-2022
Page Range:pp. 3251-3273
Publisher:Copernicus Publications
Keywords:Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa, DACCIWA, clouds, low-level clouds, aerosol emission, anthropogenic aerosol emission
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics
Deposited By: Keur, Natalie Desiree
Deposited On:23 Mar 2022 11:15
Last Modified:23 Mar 2022 11:15

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