IPCC

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IPCC
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Source Summary for Policymakers. A Report of
Working Group I of the Intergovernmental Panel on
Climate Change
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http//www.iitap.iastate.edu/gccourse/chem/gases/g
ases_lecture.html
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Complex response to changing climate, fire
regime, grazing, exotic species, etc.
http//www.cpluhna.nau.edu/Research/grasslands1.ht
m
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2000 RPA Assessment of Forest and Range Land.
U.S. DEPARTMENT OF AGRICULTURE FOREST SERVICE
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(No Transcript)
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(No Transcript)
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More CO2 added from atmosphere
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And biological activity in soils produces soil CO2
More CO2 added from atmosphere
Soil water with CO2

• Carbonic acid production
• H2O CO2 H2CO3-
• Acidic water causes breakdown of silicate
  minerals
• 2CO2 H2O CaSiO3 Ca 2HCO3- SiO2

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And biological activity in soils produces soil CO2
More CO2 added to oceans from atmosphere
Soil water with CO2

• Carbonic acid production
• H2O CO2 H2CO3-
• Acidic water causes breakdown of silicate
  minerals
• 2CO2 H2O CaSiO3 Ca 2HCO3- SiO2

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And biological activity in soils produces soil CO2
Soil water with CO2

• Carbonic acid production
• H2O CO2 H2CO3-
• Acidic water causes breakdown of silicate
  minerals
• 2CO2 H2O CaSiO3 Ca 2HCO3- SiO2
• These products get to oceans, form carbonate
  silicate sediments
• 2HCO3- Ca SiO2 CaCO3 CO2 H2O SiO2

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And biological activity in soils produces soil CO2

• Carbonic acid production
• H2O CO2 H2CO3-
• Acidic water causes breakdown of silicate
  minerals
• 2CO2 H2O CaSiO3 Ca 2HCO3- SiO2
• These products get to oceans, form carbonate
  silicate sediments
• 2HCO3- Ca SiO2 CaCO3 CO2 H2O SiO2
• All atmospheric CO2 would be gone in 10,000 years
  if this were to go unchecked.

Carbon emerges from volcanoes and is buried in
the ocean floor What is net affect to
atmospheric CO2? Must understand something
about rock weathering. Weathering increases as
mountains grow
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Long-term carbon cycle
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Source Taylor et al.
There is an excess of precipitation in the North
Pacific, especially in theeastern tropical
Pacific, and a dominance of evaporation in the
Atlantic http//www.agu.org/revgeophys/schmit01/n
ode5.html
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Curry, Dickson, and Yashayaev, 2004