Desert dust suppressing precipitation: A possible desertification feedback loop

• DOI: 10.1073/pnas.101122798
• Publication Date: 2002-07-26T14:44:19Z
• Authors: Daniel Rosenfeld; Yinon Rudich; Ronen Lahav
• Keywords: Desertification; Desert (philosophy)

The effect of desert dust on cloud properties and precipitation has so far been studied solely by using theoretical models, which predict that rainfall would be enhanced. Here we present observations showing the contrary; is to inhibit precipitation. Using satellite aircraft show clouds forming within contain small droplets produce little drop coalescence. Measurement size distribution chemical analysis individual Saharan particles collected in such a storm suggest possible mechanism for diminished rainfall. detrimental impact smaller than caused smoke from biomass burning or anthropogenic air pollution, but large abundance atmosphere renders it important. reduction affected can cause drier soil, turn raises more dust, thus providing feedback loop further decrease Furthermore, changes land use exposing topsoil initiate desertification process.