carbon oxygen cycle

Biogeochemical Cycles
carbon oxygen cycle
Oxygen Cycle
Greenhouse Gasses
Ozone Layer

1. Topic
Biogeochemical Cycles

2. Carbon-Oxygen Cycle

3. The Carbon Cycle
Circulation of CO
2
Biotic Component
Carbon is the key element in living compounds
Carbon is trapped and stored in organic compounds by
photosynthesis
CO
2 is released to the atmosphere by respiration
Abiotic Component
CO
2–found in atmosphere (0.03%) and in oceans
Can be trapped in fossil fuels
In oceans, it is incorporated into rocks, shells, corals
CO
2released into the atmosphere by combustion

4. Oxygen Cycle
Movement of oxygen between the
atmosphere and the biota
21% of atmosphere
Released by photosynthesis\
Consumed by respiration

7. Carbon Oxygen Cycle

8. Carbon Oxygen Cycle
1 Atmospheric pool of carbon dioxide
2 Plants take up carbon dioxide for
photosynthesis
3 Animals eat plants
4 Carbon didxide released by respiration
5 Fossil fuels
6 Carbon dioxide released by combustion
7 Death of organisms and decay by bacteria

9. Human impact:
burn excess fossil fuels
Use up forests
Result is more CO
2 added to atmosphere
Leads to the greenhouse effect
Greenhouse effect:
Heat blocking action of gasses in the
atmosphere
Short waves converted to long –unable to
escape atmosphere

11. Greenhouse Gasses
Name of Gas Chemical
Formula
Source
Carbon DioxideCO
2 Fossil fuels
Methane CH
4 Bacteria decay,
farts
Nitrous OxideN
2O Fertilizers,
animal wastes
CFC’s Styrofoam,
accelerants

12. Humans continue adding excess amounts of
CO
2
Since 19
th
century, levels have increased 25%
Possible increase in global temperature

14. Human Population

15. Human Population and
Technology

16. Carbon Dioxide Levels

17. Emission Levels

18. Past and Present C0
2 Levels

19. Greenhouse Gases

20. Effects:
Melting ice caps
Sea levels to increase –flooding
Change in climate patterns
More/less rainfall
Large impact on agriculture
Natural vegetation could change
Some say that oceans are a large sink for CO
2

23. Image of a Dust Bowl

25. Ozone Layer
Protects earth from UV radiation
~ 99% of UV radiation is screened and never
reaches surface
Ozone holes:
Above the poles (N & S)
Increase in skin cancer and eye problems
Major cause?
CFC’s

27. CFC’s released in sprays and as a waste
product
When in upper atmosphere, Chlorine reacts
with ozone and breaks it down
CFC’s stay in atmosphere for a very long
time
May continue to break down ozone layer
Solution?