L1 /
6
CH3041
AEROSOL IV
Mt Pinatubo (1991)
SO2 (g,20MT) ® H2SO4(aer)
in stratosphere which reflected sunlight and lowered the world temp. 0.5oC in 1992 - 3.
in stratosphere which reflected sunlight and lowered the world temp. 0.5oC in 1992 - 3.
• CCN Cloud Condensation
Nuclei (» 0.1mm)
Aerosol particles are effective in formation of cloud droplets. eg. cumulus r = 1-10 mm
Usually largely NaHSO4, NH4HSO4 & NH4NO3
Aerosol particles are effective in formation of cloud droplets. eg. cumulus r = 1-10 mm
Usually largely NaHSO4, NH4HSO4 & NH4NO3
• Condensation occurs only when p(H2O) > p(H2O)sat.
Very small water particles have higher p(H2O)sat requirements than normal.
• Salt lowers p(H2O)sat over the small H2O
particles & so condensatn occurs readily.
• CCN provide a
wettable particle of the correct
size to initiate condensation.
