ATOC 4720: class 17. Atmospheric aerosols Effects on atmospheric phenomena. Total concentration. Concentration vary with location and time. Generally,. Over the ocean:. Rural land areas:. Polluted air:. >10km, H=7km; <5km, H=3km. Size spectra. <0.2um ;. 0.2-2um; >2um. Similar.
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Over the ocean:
Rural land areas:
Combustion processes (human activities,
Forest fires, volcanoes, gas-to-particle
 Large to giant aerosol:
wind blown dust, emission of pollens,
and spores from plants; Ocean: bursting of
Air bubbles (under high windspeed); urban
Precipitation and gravity.
Global: Precipitation 80-90%;
10-20%: gravitational settling.
Aitken nuclei: <1hour in polluted
Air or in clouds;
Desert Aerosol Transport over North Africa and the Mediterranean.
The 2D distribution of aerosols
Concentration for the period
from August, 1996 to April, 2000 (top panel).
Main source regions of the UV-absorbing aerosols can be inferred, and these regions are marked in the bottom panel.
Tend to be along
The dust plume
 Clouds and precipitation:
Good: Precitaion; bad: acid rain
electricity may indicate aerosol
Scattering & absorption of solar radiation:
Important for the earth’s radiation budget;
Qr at the earth’s surface can cause
SST (sea surface temperature) variability,
And thus force variability in atmospheric
Circulation and convection: affecting
Liquid aerosol absorbs gases: react;
Solid aerosol provide surfaces upon which
Gases can be absorbed and react;
Aerosol & sulfur dioxide from polluted air
accumulate in stable (T-inversion),
moist air==sulfur dioxide is converted
1952 Landon smog caused 4000 people death.