CM SAF: Surface Radiation
The surface radation products are Essential Climate Variables.
They are retrieved from SEVIRI/GERB instruments on MSG satellite and AVHRR instruments on METOP and NOAA satellites. They are available as monthly and daily means in a 15x15 km resolution. The products can be ordered via the Web User Interface.
The Surface Albedo (SAL) is the hemispherical broadband surface albedo and is expressed in percent.
The shortwave incoming solar radiation (SIS) is the radiation flux density reaching a horizontal unit earth surface in the 0.2-4 µm wavelength range. It is usually also called global irradiance or solar surface irradiance. It is expressed in W m-2.
Beside it's relevance for climate monitoring it is also important for the planing and design of solar energy systems.
The surface net shortwave flux (SNS) is defined as the part of the surface incoming solar flux which is absorbed by the earth's surface and converted into thermal energy . It is expressed in W m-2.
Surface Downward Longwave Radiation (SDL) is defined as the thermal radiance from the atmosphere and the clouds reaching the ground in the 4-100 µm wavelength range. It is expressed in W m-2.
Surface Outgoing Longwave Radiation (SOL) is defined as the longwave terrestrial radiative flux emitted by the earth's surface beyounf 4-100 µm wavelength range. It is expressed in W m-2 This product it is dervied from the analysis of a numerical weather prediction model.
The surface net longwave radiation (SNL) is defined as the net longwave radiation flux from the earth in the spectral range 4 to 100 µm which causes a loss of thermal energy for the earth's surface. It is expressed in W m-2
Surface Radiation Budget (SRB) is defined as the sum of all incoming and outgoing shortwave and longwave radiation fluxes at the earth's surface. It is expressed in Wm-2.
More informations on the surface radiation products can be found in the respective User Manual Products and the Validation Reports, as well as in the CM SAF publications.
RM / Jan2014