Ch1-Landsurface-energybalance

Ch1-Landsurface-energybalance - Energy Budget at land...

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Energy Budget at land surface Ch. 5 in Garratt’s text, reference: Hartmann’s global physical climate " E s t = G = R n # LE # H #$ F out where G : heat storage of the surface layer R n : surface net radiation, R n = SR # LW LE : surface latent flux H : surface sensible flux $ F out : divergence of energy below the surface LW LE Η The surface layer SR E s / t Energy budget of a surface layer without vegetation:
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Under steady-state and when the energy storage is small, the energy budget of a land surface layer can be simplified to R n = LE -H because usually Δ F out << R n , LE, H Factors left out but can be important for some locations and periods: – Fraction of solar energy that is stored in the chemical bones formed during photosynethesis, can reach 5% during growing period (?); – Heat released by oxidation of biological substance as in biological decade or biomass burning; – Heat released by fossil fuel burning or nuclear power generation (e.g., big urbane areas); – Convection of the kinetic energy of winds into thermal energy; – Heat transferred by precipitation, especially when precipitation is much cooler than the surface; – Geothermal energy released in hot springs, earthquakes and volcanoes. These factors are generally unimportant globally. LW LE Η The surface layer SR
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Surface with vegetation: Vegetation will contributes to or dominate the surface albedo. The top of the surface layer is at the canopy level. Energy divergence and energy storage in the canopy layer can be significant, especially on scale shorter than daily. " E
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This note was uploaded on 11/07/2011 for the course EAS 8803 taught by Professor Staff during the Spring '08 term at Georgia Institute of Technology.

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Ch1-Landsurface-energybalance - Energy Budget at land...

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