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The precipitation process in the atmosphere
dissolve and remove CO2 from the atmosphere. |
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Rocks exposed at Earth’s surface undergo
chemical attack from this rain of dilute acid. |
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This whole process is known as chemical
weathering. |
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The rate of chemical weathering tend to increase
as temperature increases. |
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Weathering requires water as a medium both for
the dissolution of minerals and for the transport of the dissolved
materials to the ocean |
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è The rate
of chemical weathering increases as precipitation increases. |
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The chemical weathering works as a negative
feedback that moderates long-term climate change. |
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This negative feedback mechanism links CO2
level in the atmosphere to the temperature and precipitation of the
atmosphere. |
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A warm and moist climate produces stronger
chemical weathering to remove CO2 out of the atmosphere è smaller
greenhouse effect and colder climate. |
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Distance
from the Sun |
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Albedo |
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Greenhouse effect |
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Solar
Luminosity (L) |
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the
constant flux of energy put out by the sun |
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L = 3.9 x 1026 W |
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Solar
Flux Density (Sd) |
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the
amount of solar energy per unit area on a sphere centered at the Sun with a
distance d |
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Sd = L / (4 p d2) W/m2 |
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On Venus
è 510°K (very large!!) |
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On
Earth è 33°K |
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On
Mars è 6°K (very small) |
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