IB ESS HL 2.3.9 Ocean Carbon Exchange Questions

Calculate net ocean carbon gain and evaluate the benefits and risks of ocean carbon uptake.

Exam points

calculate net ocean carbon gain from carbon inputs and outputs, using the requested mass and time units
evaluate oceans as carbon sinks by linking CO₂ uptake to climate regulation and ocean-acidification risks

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Study 2.3.9—Ocean carbon exchange conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 3]

Figure Carbon cycle

(a)

Using the data in Figure, calculate the net gain in carbon in the oceans in $10^{15} \mathrm{~g}$ .

[ 1 ]

(b)

Describe one advantage and one disadvantage of the oceans as a carbon sink.

Advantage:

Disadvantage:

[ 2 ]

Advantage:
oceans are large so absorb a lot of CO2 / increases primary productivity/photosynthesis / reduces global warming/climate change;

Disadvantage:
increasing $\mathrm{CO}_{2}$ in oceans causes acidification / ocean acidification harms sensitive marine species/ecosystems like coral reefs;

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IB ESS HL 2.3.9 Ocean Carbon Exchange Questions question 1

Question (a)

Question (b)