Carbon Cycle Dynamics and Impacts

The video tutorial explains the natural carbon cycle, highlighting the small fluxes between slow and fast carbon pools through sedimentation and weathering. It contrasts these with larger fluxes between the atmosphere, terrestrial biosphere, and oceans. The role of photosynthesis in storing energy in organic molecules and the long-term storage of carbon in the geosphere are discussed. The impact of anthropogenic emissions on the carbon cycle is examined, noting that these emissions are redistributed among the atmosphere, biosphere, and oceans. The video also addresses the potential changes in ocean carbon uptake due to warming, emphasizing the importance of understanding feedback mechanisms in climate modeling.

What is the approximate amount of carbon that moves between the atmosphere and the terrestrial biosphere each year?

• 150 gigatonnes

• 120 gigatonnes

• 90 gigatonnes

• 0.2 gigatonnes

How does photosynthesis contribute to the carbon cycle?

• By releasing carbon dioxide into the atmosphere

• By storing energy in organic molecules

• By converting carbon into fossil fuels

• By increasing atmospheric carbon levels

What is the primary source of the carbon we use as fossil fuels?

• Carbon from the ocean

• Carbon from the terrestrial biosphere

• Carbon stored in the geosphere

• Atmospheric carbon

What is the significance of sedimentation in the carbon cycle?

• It has no effect on carbon storage

• It converts carbon into fossil fuels

• It releases carbon into the atmosphere

• It stores carbon in the geosphere over long periods

How are anthropogenic carbon emissions distributed in the carbon cycle?

• All emissions remain in the atmosphere

• A third goes to the atmosphere, a third to the terrestrial biosphere, and a third to the oceans

• Half goes to the oceans, half to the atmosphere

• All emissions are absorbed by the terrestrial biosphere

What is the main challenge with the current rate of carbon emissions?

• They are quickly removed from the atmosphere

• They are absorbed entirely by the oceans

• They take a long time to be removed from surface spheres

• They are immediately converted into fossil fuels

What is the role of rock weathering in the carbon cycle?

• It contributes to slow carbon transfer out of surface spheres

• It increases atmospheric carbon levels

• It rapidly removes carbon from the atmosphere

• It has no impact on the carbon cycle

What happens to the solubility of carbon dioxide as ocean temperatures increase?

• It remains constant

• It fluctuates unpredictably

• It increases

• It decreases

What is a potential future role of the ocean in the carbon cycle as it warms?

• It will become a larger carbon sink

• It will stop interacting with atmospheric carbon

• It will remain neutral

• It will become a source of CO₂

Why is understanding feedback mechanisms important in climate modeling?

• To increase carbon emissions

• To accurately predict future climate changes

• To improve fossil fuel extraction

• To predict weather patterns