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2.7. The Atmosphere.

COMPOSITION

Is a dynamic equilibrium, for processes that change
levels (respiration/Photosynth.), only varied over large time-scales.
o CHANGES WITH TIME
DIURNAL:- CO2 rises at night (no photosynth.); and falls during day.
: Water vapour varies due to transpiration, evaporation, and precipitation ­ which vary with temperature.
LONG…

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o CONSEQUENCES OF GLOBAL CLIMATE CHANGE: +4oc in next 100 years
SEA LEVEL RISE
Thermal Expansion: Slight expansion seas with heat = rise. Slow process: deep water must be brought to surface to heat.
Melting Land Ice: Only land ice will contribute to sea level rise when melting, or glacial…

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Effects of the positive feedback mechanism / WARMING...
Increased rate of decomposition = more CO2
Reduced ice mass = less albedo / methane release = more heating
Forest fires more common = more CO2

Effects of the negative feedback mechanism / Maintaining Equilibrium...
Increased temp. = increased photosynthesis = more…

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ClO2 > more chlorine. REPEAT: ClO2 > Cl + O2
The reaction begins & ends with a chlorine radical!
Removes starting materials for reactions which maintain ozone = more ozone depletion.

POLLUTION FROM CFCs
Chlorofluorocarbons = Only Chlorine, Fluorine, and Carbon. Used to be used in aerosols.
Low solubility &…

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