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Lecture23_EAS1600_Fall08

Lecture23_EAS1600_Fall08 - EAS 1600 Introduction to...

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EAS 1600 Introduction to Environmental Sciences ____________________________ Lecture 23- Long-Term C Cycle ________________________________ There are two aspects of this cycle we will focus on: ¾ its relationship to the long-term stability of atmospheric O 2 ; and ¾ its role in long-term climate stability
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Oxygen and Carbon Dioxide Oxygen in the atmosphere was formed via photosynthesis However, CO 2 is going up in concentration therefore O 2 must be going down due to combustion CH 2 O + O 2 CO 2 + H 2 O Will oxygen levels be depleted eventually?
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Actually, scientists believe that atmospheric O 2 is subject to an active stabilization mechanism. Atmospheric O 2 is believed to have been constrained over past few hundred million years to the fire window Why? ¾ How? It is quite possible that negative feedbacks exist in Earth System act to stabilize atmospheric oxygen. At least two mechanisms have been proposed …
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Atmospheric Oxygen Deep-ocean Oxygen Burial of Organic C in ocean sediments (-) ¾ For example, controls on the burial of organic carbon in ocean sediments :
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