Articles | Volume 23, issue 15
https://doi.org/10.5194/acp-23-8515-2023
https://doi.org/10.5194/acp-23-8515-2023
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

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Cited articles

BAOBAB: SEDOO database – DACCIWA, BAOBAB [data set], http://baobab.sedoo.fr/DACCIWA/, last access: 27 February 2020. 
Baum, B. A., Heymsfield, A. J., Yang, P., and Bedka, S. T.: Bulk Scattering Properties for the Remote Sensing of Ice Clouds. Part I: Microphysical Data and Models, J. Appl. Meteor., 44, 1885–1895, https://doi.org/10.1175/JAM2308.1, 2005a. 
Baumgardner, D., Jonsson, H., Dawson, W., O'Connor, D., and Newton, R.: The cloud, aerosol and precipitation spectrometer (CAPS): a new instrument for cloud investigations, Atmos. Res., 59–60, 251–264, 2001. 
Borrmann, S., Luo, B., and Mishchenko, M.: 2000: Application of the T-Matrix method to the measurement of aspherical (ellipsoidal) particles with forward scattering optical particle counters, J. Aerosol Sci., 31, 789–799, 2000. 
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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.
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