Transcript Aerosols and clouds

Aerosols and clouds
Aerosols-the germs of rain clouds
Contents
• What are aerosols
• Impacts of aerosols on the weather
• Biologic particles
• Researches
• Cloudsat
What are aerosols
• Aerosols can be foundation for clouds
• Influence climate  form clouds as
nucleations
• Waterdrops form a deposit in the
atmosphere
• Freeze and melt  fall to earth as rain
Impacts of aerosols on the weather
• Aerosols can be dirt-, salt- and ash
particles, spores or bacteria
 contribute forming snow and rain
• Investigations  fewest aerosols in
Antarctica, most in Montana, USA and
France
Biological particles in aerosols
• Difficult to find out how many aerosols are
in the atmosphere
• Brent Christner: took 19 snow samples
from different countries
• Result: aerosols are very common
 Play major roll as crystallization
germs
Researches
• US-Researchers determined in summer in
the southern USA  more rain throughout
the week than on the weekend
• Because throughout the week, more dirt
particles from traffic and industry in the
atmosphere
 Increase storms and rainfall
Cloudsat
Measures aerosols in
the atmosphere