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Terms in this set (24)
sinks of carbon
oceans (dissolved CO2 and living and nonliving shells), old growth forests (terrestrial biosphere stores most of the above ground soil and carbon), plant matter (photosynthesis), sedimentary deposits (limestone rock and carbon trapped in fossil fuels)
How far back are scientists able to reconstruct atmospheric CO2
How do ice cores help show ancient climates?
Every year, a new layer of ice and snow freezes over the previous one. This traps air, dirt, pollen, dust, and other things that can be used to determine temperature and climate
atmospheric carbon affects?
Oxygen-16, evaporates easily
oxygen-18: evaporates less easily, condenses more readily
Rain contains which type of more of which type of oxygen
ice contains more of which type of oxygen
As temperatures rise and ice sheets melt which type of oxygen returns to the water?
Light oxygen reduces the ________ of oceans world wide
scientists associate lower levels of heavy oxygen with?
less heavy oxygen in ice cores means?
temperatures were colder
Global cooling trend last 50-60 million years
Cycles driven by variation in Earth's orbit around Sun through time
Results in different amount and distribution of solar energy
These variations affect growth and melting of ice sheets
NADW (North Atlantic Deep Water)
The deep portion of the thermohaline circulation in the northern Atlantic Ocean.
The growth of ice sheets in the northern hemisphere caused the shut down of
colder solutions holds?
earth encounters more variation in the energy that it receives from the sun when earths orbit is elongated than it does when earths orbit is more circular
The tilt of the earth varies between 22.2 and 24.5. The greater tilt angle is more solar energy the poles receive.
a gradual wobble that alters the orientation of Earth's axis in space
concentration of the atmosphere over the time scale of millions of years is controlled by?
the cycles of supercontinent formation and breakup
what are three reasons of Wilsons cycles
weathering, change of ridge activity, organic matter burial
weathering ( wilsons cycles)
as supercontinents form, Co2 is removed from the atmosphere by weathering of freshly formed mountain ranges
Changes in ridge activity (wilsons cycles)
as a supercontinent forms and a mid- ocean ridge is destroyed, that atmospheric CO2 decreases
Organic matter burial
as supercontinents form, increased weathering increases nutrient delivery, which results in an increase in organic matter burial and a decrease in atmosphere CO2