Ib Biology Greenhouse Effect Notes

Topics: Carbon dioxide, Oxygen, Greenhouse gas Pages: 4 (1272 words) Published: October 1, 2012
5.2 The greenhouse effect
5.2.1 Diagram of carbon cycle and processes involved.
Respiration & metabolism
Photosynthesis: the process of converting light energy to chemical energy and storing it in the bonds of sugar.

Respiration: the release of energy from food and it takes place in animal and plant cells.

Combustion: the process in which a substance reacts with oxygen to give heat and light.

5.2.2. Analysis of change in concentration of atmospheric CO2 with records. Mauna Loa Data
The red line represents the carbon levels. The amount of carbon dioxide is increasing steadily. This is caused by the burning of fossil fuels and deforestation ( since trees absorb CO2 and cutting down of trees in turn causes an increase in the amount of CO2 concentration) The zigzag pattern is caused due to the seasonal activity of photosynthesis, in the summers there is low concentration of CO2 due to high photosynthesis (more plants are alive in the summers because of the heat). The opposite takes place in the winters when there is higher concentration due to low photosynthesis since most of the deciduous plants die due to cold temperature.

Rising levels of carbon dioxide comes from measurements of air samples (balloons are sent). The observatory is in an ideal position as a sampling point for atmospheric gases because it is in the middle of the Pacific Ocean, away from the local effects of continental industry. Cape Grim

The Cape Grim station is positioned on the edge of Tasmania. It is in an important site, as the air sampled arrives at Cape Grim after long trajectories over the Southern Ocean, under conditions described as ‘baseline’. This baseline air is representative of a large area of the Southern Hemisphere, unaffected by regional pollution sources (there are no nearby cities or industry that would contaminate the air quality).

5.2.3 Relation between the concentration of atmospheric CO2, methane and oxides of nitrogen and the enhanced...
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