The Carbon Cycle (Leaving Cert Chemistry): Flashcards

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The Carbon Cycle
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Definition of carbon cycle

How carbon moves continuously between Earth's systems

% of \ceCO2\ce{CO2} in atmosphere

0.04%

Definition of carbon source

Process that releases \ceCO2\ce{CO2} to atmosphere

Human activities adding \ceCO2\ce{CO2}

Fossil fuel combustion, limestone roasting

Natural carbon sources

Respiration, forest fires, volcanic eruptions

Definition of carbon sink

System absorbing more carbon than it releases

Examples of carbon sinks

Photosynthesis, ocean absorption, rainfall

Why forests are carbon sinks

Trees absorb \ceCO2\ce{CO2}, store carbon in wood & roots

Peatlands/wetlands as carbon sinks

Waterlogged conditions trap carbon, prevent decomposition

Natural carbon cycle balance

Processes adding \ceCO2\ce{CO2} roughly equal those removing it

Human impact on carbon cycle

Adding \ceCO2\ce{CO2} faster than natural sinks can remove it

Effect of extra \ceCO2\ce{CO2} in atmosphere

Traps more heat, contributes to global warming

Impact of damaged carbon sinks

Reduced ability to absorb \ceCO2\ce{CO2}, accelerates climate change

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