Climate Change-lecture_20

Each must be in a steady state to have a constant

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Each must be in a steady state to have a constant temperature. Both the atmosphere and the surface are in steady state (overall) so the whole planet is also in a steady state. (picture) Energy is absorbed and re-emitted to differing degrees by the different components. The detailed exchanges of energy between the atmosphere and the surface are critical to life on earth. (slide of accounting of amount of energy rec. from sun on moodle- earth’s energy budget) Earth’s energy budget: Sun delivers 100 units of energy to the top of the atmosphere. ATMOSPHERE: Atmosphere(visible spectrum) 1.reflects 25 2.absorbs 25 (thermalizes) Atmosphere emits IR (thermal) 1. 66 to space 2. 88 to surface (greenhouse) Balance (atmosphere) In = 25+100+29 = 154 Out = 66 +88 = 154 SURFACE: Surface (visible spectrum) 1. Reflects 5 2. Absorbs 45 (thermalizes) Surface emits IR (thermal) 1. 4 to space 2. 100 to atmosphere Latent heat from surface due to water condensation 1. 29 to atmosphere Balance (surface): In = 45 + 88 = 133 Out = 4 + 100 + 29 = 133 sun delivers 100 units but the surface receives 133! Natural greenhouse effect needed for life Balance (whole planet)
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In = 70 Out = 70 What are the major greenhouse gases? Water vapour: Includes clouds and suspended moisture Responsible for most of the greenhouse effect (66-85%) Carbon dioxide : Produced in biological and physical processes Produced in the combustion of organic matter Responsible for 9 – 26% of the greenhouse effect.
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