Lecture3Energy&Climate

Lecture3Energy&Climate - Scales of Ecological...

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Unformatted text preview: Scales of Ecological Organization Organism Population Community Ecosystem Biosphere Physical factors drive the distribution of organisms at the global scale 1. Light (indirect) 2. Temperature (direct) 3. Precipitation (direct) Climate the average weather condition (for example: 30 yr mean) ultimate source of energy: the sun Energy input = energy out 343 Watts/m2 incoming radiation is mostly short wave (vis, NIR, UV) 31% reflected by clouds or surface 20% absorbed by clouds and atmosphere 49% absorbed by earth surface Energy Losses 19% longwave net radiation from earth surface 7% lost as sensible heat flux conduction , convection 23% lost as latent heat flux water vapor Global climate is driven by: 1. Differential heating of the tropics-same amount of radiation over larger surface area at poles-radiation travels through more atmosphere at poles ITCZ = Inter Tropical Convergence Zone-net radiation deficit above 35º N and S January February March April May June July August...
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Lecture3Energy&Climate - Scales of Ecological...

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