THE RADIATION BUDGET (Exercise) Exercise: Monitor radiation budget at 2 sites (urban rural) using instruments.

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Presentation transcript:

THE RADIATION BUDGET (Exercise) Exercise: Monitor radiation budget at 2 sites (urban rural) using instruments

RADIATION BUDGET: Balance between incoming energy from the sun (SWR) and the outgoing long-wave (LWR) and reflected shortwave energy from the Earth. R = INPUT – OUTPUT R = SWR + LWR - SWR - LWR

RADIATION BUDGET

R (Net Radiation) in W m -2 Energy available for us, vegetation, environmental processes (ex: heat the air) (Q+q): total solar radiation in W m -2 a : albedo (no dimension) I : outgoing LWR ( W m -2 ) I : atmospheric counter radiation (absorbed by the surface)

MEASUREMENT OF SOLAR RADIATION AND ALBEDO Instrument: Pyranometer (Q+q) total solar radiation: direct measurement with pyranometer right side up Albedo: a = [(Q+q) a ] / (Q+q) Reflected solar radiation (pyranometer upside down)

MEASUREMENT OF OUTGOING LONG WAVE RADIATION Instrument: Infrared thermometer (“gun”) I =  T 4  Boltzmann constant T in °K Ts: Target temperature associated with the surface Te: Target temperature associated with sky and sorrounding environment

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