EESB04H3 Lecture Notes - Lecture 3: Shortwave Radiation, Solar Irradiance, Dimensionless Quantity
30 Apr 2021
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Eesb04 lecture 3: energy in hydrology, the global energy balance: driver of hydrological processes. Energy pathways and principles: the driver of energy on earth is radiation from the sun. Radiation : main drivers of spatial and temporal variation of the energy received from the sun, seasons, latitude, clouds, surface characteristics (i. e. reflectance) Insolation is energy received from the sun (incoming solar radiation). Insolation is shortwave radiation: shortwave radiation inputs include, ultraviolet light (uv, visible light, near-infrared wavelengths. Solar constant: the sun"s energy arrives at the outer edge of the atmosphere at an average rate of: 1. 74 x 1017 w: this, divided by the area of the earth (1. 28 x 1014 m2) is 1367 w m-2, this is referred to as the solar constant (isc). Albedo: albedo is shortwave radiation only, the radiation balance (q*, q*=k*+ l* The expenditure of net radiation (q*: net radiation is expended from a surface through 3 pathways, le (latent heat of evaporation).
