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Flashcards in Carbon EQ 1 Deck (14)
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What is a store

A place where carbon resides. Can be known as a pool, stock or reservoir
They can be terrestrial, oceanic and atmospheric


What is a flux

Refers to the movement or transfer of carbon between stores. Fluxes create cycles and feedback


Define geological carbon

Results from the formation of sedimentary carbonate rocks in oceans


Define biologically derived carbon

Is stored in shale, coal and other sedimentary rocks


Define outgassing

Occurs when terrestrial carbon within the mantle is released into the atmosphere as CO2 when volcanoes erupt


Define chemical weathering

Occurs when CO2 in the atmosphere combines with rainfall to produce weak carbonic acid, which dissolved carbon-rich rocks. This releases bicarbonates, which are eventually deposited as carbon on the ocean floor


Four key processes transfer carbon from one store to another in the cycle



Types of carbon

Inorganic- in rocks as bicarbonate and carbonate (earths largest carbon store)

Organic- found in plant material

Gaseous- found CO2, CH4, CO


How does the biological carbon pump work

Phytoplankton in ocean surface layer contain chlorophyll and need sunlight to live—— the sequester CO2- create shells of calcium carbonate

When they die, carbon rich organisms sink to ocean floor——build up in sediment

Phytoplankton need vast quantities of nutrition

Upwelling currents maintain pump- change in water temp alter flow


Terrestrial store of carbon

Organisms- green plants primary producers that use solar energy


Role of soil in biological carbon

Sequestration- CO2 in atmosphere taken in by plants, some carbon lost through respiration

Storage- decaying organisms containing carbon are buried in the soil. Oxygen poor environment causes slow breakdown resulting in carbon store


Role of mangroves in biological carbon

If drained or cleared carbon released in atmosphere

If 2% of worlds mangroves are lost, the amount of carbon released will be 50 times the natural sequestration rate


How do tundra soils act as carbon stores?

Much of soil in Tundra regions is permanently frozen
Microbe activity only takes place in surface layers when thawed
Roots, dead and decayed organic matter are frozen- locking up carbon


How do tropical forests act as carbon stores?

Litter and dead wood decay are recycled quickly so the soil store barely develops.
Rainforests absorb atmospheric CO2- accounting for 30% of global net primary production