Pollution slightly enhances atmospheric cooling by low-level clouds in tropical West Africa

Hahn, Valerian; Meerkötter, Ralf; Voigt, Christiane; Gisinger, Sonja; Sauer, Daniel; Catoire, Valéry; Dreiling, Volker; Coe, Hugh; Flamant, Cyrille; Kaufmann, Stefan; Kleine, Jonas; Knippertz, Peter; Moser, Manuel; Rosenberg, Philip; Schlager, Hans; Schwarzenboeck, Alfons; Taylor, Jonathan

doi:https://doi.org/10.5194/acp-23-8515-2023

Articles | Volume 23, issue 15

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Articles | Volume 23, issue 15

https://doi.org/10.5194/acp-23-8515-2023

Articles | Volume 23, issue 15

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Research article

01 Aug 2023

Research article |

| 01 Aug 2023

Pollution slightly enhances atmospheric cooling by low-level clouds in tropical West Africa

Valerian Hahn, Ralf Meerkötter, Christiane Voigt, Sonja Gisinger, Daniel Sauer, Valéry Catoire, Volker Dreiling, Hugh Coe, Cyrille Flamant, Stefan Kaufmann, Jonas Kleine, Peter Knippertz, Manuel Moser, Philip Rosenberg, Hans Schlager, Alfons Schwarzenboeck, and Jonathan Taylor

Valerian Hahn

CORRESPONDING AUTHOR

valerian.hahn@dlr.de

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Institute for Atmospheric Physics, Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 21, 55099 Mainz, Germany

Ralf Meerkötter

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Christiane Voigt

https://orcid.org/0000-0001-8925-7731

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Institute for Atmospheric Physics, Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 21, 55099 Mainz, Germany

Sonja Gisinger

https://orcid.org/0000-0001-8188-4458

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Daniel Sauer

https://orcid.org/0000-0002-0317-5063

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Valéry Catoire

https://orcid.org/0000-0001-8126-3096

UMR CNRS–Universite Orleans–CNES, 3A Av. Recherche Scientifique, 45071 Orleans CEDEX 2, France

Volker Dreiling

Flight Experiments, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Weßling, Germany

Hugh Coe

https://orcid.org/0000-0002-3264-1713

Centre for Atmospheric Science, The University of Manchester, Simon Building, Oxford Road, Manchester, M13 9PL, UK

Cyrille Flamant

https://orcid.org/0000-0002-8309-6495

Laboratoire Atmosphères, Milieux, Observations Spatiales, UMR 8190 CNRS–Sorbonne Université–Université Paris-Saclay–Campus Jussieu, Boite 102 Tour 45 Couloir 45-46, 3e Etage 4 Place Jussieu, 75252 Paris CEDEX 05, France

Stefan Kaufmann

https://orcid.org/0000-0002-0767-1996

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Jonas Kleine

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Peter Knippertz

https://orcid.org/0000-0001-9856-619X

Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany

Manuel Moser

https://orcid.org/0000-0001-8603-2756

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Institute for Atmospheric Physics, Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 21, 55099 Mainz, Germany

Philip Rosenberg

https://orcid.org/0000-0002-6920-0559

School of Earth and Environment, University of Leeds, Woodhouse, Leeds, LS2 9JT, UK

Hans Schlager

Institute of Atmospheric Physics (IPA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Münchener Straße 20, 82234 Wessling, Germany

Alfons Schwarzenboeck

Laboratoire de Météorologie Physique (LaMP), Université Clermont Auvergne, avenue Blaise Pascal 4, CNRS, TSA 60026, CS 60026, 63178 Aubière CEDEX, France

Jonathan Taylor

https://orcid.org/0000-0002-2120-186X

Centre for Atmospheric Science, The University of Manchester, Simon Building, Oxford Road, Manchester, M13 9PL, UK

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XML: 51
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BibTeX: 47
EndNote: 39

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Aug 2023	307	53	14	374
Sep 2023	91	12	2	105
Oct 2023	95	9	3	107
Nov 2023	50	1	3	54
Dec 2023	53	13	3	69
Jan 2024	39	9	2	50
Feb 2024	18	2	0	20
Mar 2024	24	11	2	37
Apr 2024	25	9	3	37
May 2024	19	4	0	23
Jun 2024	54	6	1	61
Jul 2024	19	6	2	27
Aug 2024	26	9	1	36
Sep 2024	33	1	0	34
Oct 2024	36	3	0	39
Nov 2024	20	3	2	25
Dec 2024	24	2	0	26
Jan 2025	33	8	7	48
Feb 2025	21	4	1	26
Mar 2025	24	11	5	40

Cumulative views and downloads (calculated since 01 Aug 2023)

Month	HTML	PDF	XML	Total
Aug 2023	307	53	14	374
Sep 2023	91	12	2	105
Oct 2023	95	9	3	107
Nov 2023	50	1	3	54
Dec 2023	53	13	3	69
Jan 2024	39	9	2	50
Feb 2024	18	2	0	20
Mar 2024	24	11	2	37
Apr 2024	25	9	3	37
May 2024	19	4	0	23
Jun 2024	54	6	1	61
Jul 2024	19	6	2	27
Aug 2024	26	9	1	36
Sep 2024	33	1	0	34
Oct 2024	36	3	0	39
Nov 2024	20	3	2	25
Dec 2024	24	2	0	26
Jan 2025	33	8	7	48
Feb 2025	21	4	1	26
Mar 2025	24	11	5	40

Total article views: 1,074 (including HTML, PDF, and XML)

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Views and downloads (calculated since 24 Nov 2022)

Month	HTML	PDF	XML	Total
Aug 2023	307	53	14	374
Sep 2023	91	12	2	105
Oct 2023	95	9	3	107
Nov 2023	50	1	3	54
Dec 2023	53	13	3	69
Jan 2024	39	9	2	50
Feb 2024	18	2	0	20
Mar 2024	24	11	2	37
Apr 2024	25	9	3	37
May 2024	19	4	0	23
Jun 2024	54	6	1	61
Jul 2024	19	6	2	27
Aug 2024	26	9	1	36
Sep 2024	33	1	0	34
Oct 2024	36	3	0	39
Nov 2024	20	3	2	25
Dec 2024	24	2	0	26
Jan 2025	33	8	7	48
Feb 2025	21	4	1	26
Mar 2025	24	11	5	40

Cumulative views and downloads (calculated since 24 Nov 2022)

Month	HTML	PDF	XML	Total
Aug 2023	307	53	14	374
Sep 2023	91	12	2	105
Oct 2023	95	9	3	107
Nov 2023	50	1	3	54
Dec 2023	53	13	3	69
Jan 2024	39	9	2	50
Feb 2024	18	2	0	20
Mar 2024	24	11	2	37
Apr 2024	25	9	3	37
May 2024	19	4	0	23
Jun 2024	54	6	1	61
Jul 2024	19	6	2	27
Aug 2024	26	9	1	36
Sep 2024	33	1	0	34
Oct 2024	36	3	0	39
Nov 2024	20	3	2	25
Dec 2024	24	2	0	26
Jan 2025	33	8	7	48
Feb 2025	21	4	1	26
Mar 2025	24	11	5	40

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Total article views: 1,074 (including HTML, PDF, and XML) Thereof 1,074 with geography defined and 0 with unknown origin.

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China	2	537	23
Germany	3	303	13
India	4	89	3
France	5	81	3

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China	2	145	11
Germany	3	138	11
India	4	75	6
Brazil	5	38	3

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China	1	392	36
United States of America	2	281	26
Germany	3	165	15
France	4	44	4
Ireland	5	34	3


Total:	0
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790


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509


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392

Cited

Show all Final revised paper only Preprint only

3 citations as recorded by crossref.

Overview and statistical analysis of boundary layer clouds and precipitation over the western North Atlantic Ocean S. Kirschler et al. 10.5194/acp-23-10731-2023
Bayesian cloud-top phase determination for Meteosat Second Generation J. Mayer et al. 10.5194/amt-17-4015-2024
A database of aircraft measurements of carbon monoxide (CO) with high temporal and spatial resolution during 2011–2021 C. Xue et al. 10.5194/essd-15-4553-2023

3 citations as recorded by crossref.

Overview and statistical analysis of boundary layer clouds and precipitation over the western North Atlantic Ocean S. Kirschler et al. 10.5194/acp-23-10731-2023
Bayesian cloud-top phase determination for Meteosat Second Generation J. Mayer et al. 10.5194/amt-17-4015-2024
A database of aircraft measurements of carbon monoxide (CO) with high temporal and spatial resolution during 2011–2021 C. Xue et al. 10.5194/essd-15-4553-2023

Latest update: 31 Mar 2025

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Short summary

During the DACCIWA campaign in West Africa, we found a 35 % increase in the cloud droplet concentration that formed in a polluted compared with a less polluted environment and a decrease of 17 % in effective droplet diameter. Radiative transfer simulations, based on the measured cloud properties, reveal that these low-level polluted clouds radiate only 2.6 % more energy back to space, compared with a less polluted cloud. The corresponding additional decrease in temperature is rather small.

During the DACCIWA campaign in West Africa, we found a 35 % increase in the cloud droplet...

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