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Articles
Evidence for Liquid-Phase Cirrus Cloud Formation from Volcanic Aerosols: Climatic Implications
1 Department of Meteorology, University of Utah, Salt Lake City, UT 84112
Supercooled droplets in cirrus uncinus cell heads between -40° and -50°C are identified from Project FIRE [First ISCCP (International Satellite Cloud Climatology Project) Regional Experiment] polarization lidar measurements. Although short-lived, complexes of these small liquid cells seem to have contributed importantly to the formation of the cirrus. Freezing-point depression effects in solution droplets, apparently resulting from relatively large cloud condensation nuclei of volcanic origin, can be used to explain this rare phenomenon. An unrecognized volcano-cirrus cloud climate feedback mechanism is implied by these findings. Submitted on March 17, 1992Accepted on June 1, 1992
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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