Cloud condensation nuclei - Wikipedia, the free encyclopedia
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Cloud condensation nuclei or CCN s (also known as cloud seeds ) are small particles (typically 0.2 µm, or 1/100 th the size of a cloud droplet ) about which cloud droplets coalesce. Water require...
en.wikipedia.org/wiki/Cloud_condensation_nuclei
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Condensation nuclei are aerosols that act as the initial sites for condensation of water vapor into cloud droplets or cloud ice particles. Virtually all cloud droplets or ice particles originate around condensation nuclei which "attrac...
http://www.weatherquestions.com/What_are_condensation_n...
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Condensation nuclei are small particles or aerosol upon which water vapor attaches to initiate condensation. Dust particulates, sea salt, sulfur and nitrogen oxide aerosols serve as common condensation nuclei.
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www.uwsp.edu/geo/faculty/ritter/glossary/a_d/condensati...
www.uwsp.edu/geo/faculty/ritter/glossary/a_d/condensation_nuclei.html
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Hence condensation nuclei act as a platform for condensation to take place, increasing the size of a droplet and decreasing surface tension. Water absorbent clay minerals and sea salt are good condensation nuclei.
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www.uwsp.edu/geo/faculty/ritter/geog101/textbook/atmosp...
www.uwsp.edu/geo/faculty/ritter/geog101/textbook/atmospheric_moisture/condensation_process.html
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Sources of cloud condensation nuclei can be both natural and human-caused. Natural sources of cloud condensation nuclei include volcanic dust, sea spray salt, and bacteria. Humans also release unnatural chemicals into the air from the burning of fossil fuels and from industrial sources.
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weather.about.com/od/c/g/cloudnuclei.htm
weather.about.com/od/c/g/cloudnuclei.htm
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A cloud forms in the atmosphere as a result of condensation of water vapor. Condensation nuclei, such as in smoke or dust particles, form a surface upon which water vapor can condense. Related term: Dave's Dictionary...
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www.weather.com/glossary/c.html
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The condensation of droplets from water vapor depends on the presence in the atmosphere of minute particles. In the atmosphere, clouds can form at relative humidities of less than 100%. This is due to the presence of minute (0.1 - 2 micrometers in radius) water- attracting (hygroscopic) particles. ... nuclei di condensazione...
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www.vivoscuola.it/us/rsigpp3202/umidita/attivita/CCN.ht...
www.vivoscuola.it/us/rsigpp3202/umidita/attivita/CCN.htm
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The “ion-aerosol clear-air” hypothesis suggests that increased cosmic rays cause increases in new-particle formation, cloud condensation nuclei concentrations (CCN), and cloud cover.
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www.agu.org/pubs/crossref/2009/2009GL037946.shtml
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We use a global aerosol microphysics model to predict the contribution of boundary layer (BL) particle formation to regional and global distributions of cloud condensation nuclei (CCN). Including an observationally derived particle formation scheme, where the formation rate of molecular clusters is proportional to...
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www.agu.org/pubs/crossref/2008/2007GL033038.shtml
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