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A Level Physical Geography > Carbon Cycle > Flashcards

Flashcards in Carbon Cycle Deck (13)
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1

What is the most major store of carbon ?

99.9% in lithosphere

2

State two molecules carbon is stored in within the atmosphere

Methane
Carbon dioxide

3

Where is carbon stored in the cryosphere?

Permafrost

4

What is a significant link between water storage in the ocean and carbon flows

CO2 dissolves in water bodies

5

Give flows within the carbon cycle

Photosynthesis
Respiration
Decomposition - detritovores transfer carbon to atmosphere
Ocean uptake
Weathering - acid rain (carbonic acid)

6

Describe natural climate change

Quaternary geological period
Evidence seen of fluctuations in carbon dioxide levels along with temperature levels
I.e. Correlation doesnt prove causation
Simply when its naturally warmer more CO2 is released e.g. Less in the ocean

7

Describe a positive feedback loop involving permafrost in the carbon cycle

Permafrost melts
Methane released
Enhanced greenhouse effect
More melting

8

Describe wildfires as a natural cause of variation within the carbon cycle

Rapid transfer of lost of carbon
Less photosynthesis
But can improve fertiltiy in long term so effect is negated (negative feedback)

9

Describe volcanic activity as a natural cause of variation within the carbon cycle

130-300 million tonnes of CO2 released annually by volcanoes
Much more active in Palaeozoic age

10

What percentage of carbon emissions are to do with hydrocarbon burning, who came up with this statistic

90% IPPC

11

Describe the role of defforestation in the carbon cycle

Reduces biospheric store
Often trees burnt - combustion

12

Describe who agricultural activities cause changes in the carbon cycle

Paddy fields produce 20% of global methane
Cows produce 5.5 million tonnes of methane per year

13

Describe a negaive feedback loop in the carbon cycle involving phytoplankton

Increased global temperature favours growth of phytoplankton
Phytoplankton release dimethyl sulphide
Causes cloud formation
Global cooling occurs as less uv hits the earth (more reflected by clouds)