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Karen Ing (49)

Env200 feb 7 lec 9.docx

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School of Environment
Karen Ing

Env200 feb 7 lec 9  Greenhouse gases absorbs infrared raditation and it warms the atmogphere  natural and enhanced greenhouse effect o Radiative forcing-the imbalance in the earth’s energy budget that results when the amount of energy radiated to outer space is changed thorugh eith natural or human infleucens; you have have positive or negative  Positive=warming  Negative =cooling o Cooling the atmosphere  Some pollutants cool the atmosphere  Atmospheric aerosols put stuff out into the atmosphere by  Natural human sources  Reflect sunlight into space  Cools atmosphere  Sulphur haze, volcanic eruptions o Causes of the enhance greenhouse effect  Two important factors: amount of gas emitted and properties of the gas  Avg residence time: length of time gas reside in the atmosphere  Global warming potential: how much given mass of greenhouse gas contributes to global warming over a period of time compared to the same mass of carbon dioxide  Greenhouse gases and climate change graph*  Therefore understanding and predicting how atmospheric co2 lvls may chance in the future means we need to understand where carbon is stored and how it moves around  Carbon cycle** 5 significant pools o Atmosphere (827 gt in 2011 or 390 ppm) o Forests/soils (610 gt/1580) o Surface ocean (1020 gt) o Deep ocean (38, 100 gt) o Fossil fuel (5000 gt) o The pools are not as important as the fluxes  Carbon fluxes (out) o Photosynthesis/respiration o Changing the way we use land ex: deforestation and even plant trees o Surface ocean flux o Flux to the deep ocean o Fossil fuel  Natural sinks: only 2 fluxes out of the atmosphere: diffusion into the ocean and uptake by photosynthesis(plant more plant material so photosynthesis happens)  To what extence can these natural uptake mechanism deal with anthropogenically driven increases in atmospheric carbon o 1. Terrestrial photosynthesis  Fossil fue
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