BIOL 2060 Lecture Notes - Lecture 32: North Atlantic Oscillation, Ozone Layer, Carbon Cycle
19 Apr 2016
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Document Summary
A single ecological system: wrapped in an atmospheric envelope. Clean, dry air at earth"s surface consists of. 78. 8% nitrogen, 20,94% oxygen, 0. 038% co2, 0. 00005% ozone: plus trace gases, water vapour, dust. Ozone layer works to protect us against uv light. Reflects uv light back into outerspace: makes life possible. Large-scale atmospheric and oceanic phenomena influence the ecological system on a global scale. Rapid pace of global change through human activities alters: climate, biogeological cycles, land use. Organisms can be converted and stored as organic carbon as peat, coal, or oil: when used as fuel, carbon is converted to inorganic form and transferred back to atmosphere. Atmosphere helps keep the surface of earth warm: heat is trapped near the earth"s surface by greenhouse gases absorb 70% of solar radiation. Greenhouse gases radiate some of the heat they absorb down to the. Earth"s surface: changes in composition of greenhouse gases due to fossil fuel use.
