Articles | Volume 23, issue 15
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

Data sets


Archive Catalogue European Centre for Medium-range Weather Forecast

Archive Catalogue - Copernicus Atmosphere Monitoring Service (CAMS) European Centre for Medium-range Weather Forecast

AERONET (Aerosol Robotic Network) NASA

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.
Final-revised paper