NDLI: Desert dust suppressing precipitation: a possible desertification feedback loop.

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Desert dust suppressing precipitation: a possible desertification feedback loop.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rudich, Y. Lahav, R. Rosenfeld, D.
Description	Author Affiliation: Rosenfeld D ( Institute of Earth Sciences, The Hebrew University, Jerusalem 91904, Israel.);
Abstract	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; the effect of dust on cloud properties is to inhibit precipitation. Using satellite and aircraft observations we show that clouds forming within desert dust contain small droplets and produce little precipitation by drop coalescence. Measurement of the size distribution and the chemical analysis of individual Saharan dust particles collected in such a dust storm suggest a possible mechanism for the diminished rainfall. The detrimental impact of dust on rainfall is smaller than that caused by smoke from biomass burning or anthropogenic air pollution, but the large abundance of desert dust in the atmosphere renders it important. The reduction of precipitation from clouds affected by desert dust can cause drier soil, which in turn raises more dust, thus providing a possible feedback loop to further decrease precipitation. Furthermore, anthropogenic changes of land use exposing the topsoil can initiate such a desertification feedback process.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	11
Volume Number	98
Language	English
Publisher	National Academy of Sciences
Publisher Date	2001-05-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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