ECV Products and Requirements for Earth Radiation Budget
These products and requirements reflect the Implementation Plan 2016 (GCOS-200). GCOS is reviewing and will update the requirements until 2022. More information on: gcos.wmo.int.
| PRODUCT | DEFINITION | FREQ. | RES. | REQ. MEAS. UNCERT. | STAB. | STANDARDS/ REFERENCES |
| Top-of-atmosphere ERB longwave | Flux density of terrestrial radiation emitted by the Earth surface and the gases, aerosols and clouds of the atmosphere at the top of the atmosphere (W/m2) | Monthly (resolving diurnal cycle) | 100km/NA | Requirements on global mean: 1W/m2 | 0.2 W/m2/decade | NOAA Tech Rep. NESDIS 134 |
| Top-of-atmosphere ERB shortwave (reflected) | Flux density of solar radiation, reflected by the Earth surface and atmosphere, emitted to space at the top of the atmosphere (W/m2) | Monthly (resolving diurnal cycle) | 100km/NA | Requirements on global mean: 1.0 W/m2 | 0.3 W/m2 /decade | NOAA Tech Rep. NESDIS 134 |
| Total solar irradiance | Flux density of solar radiation at top-of-atmosphere (W/m2) | Daily | NA/NA | 0.04% | 0.01%/decade | |
| Solar spectral irradiance | Total Solar Irradiance (TSI); when measured as a function of wavelength it is the spectral irradiance (W/m2/µm) | Daily | Spectral resolution: 1 nm | 0.3%(200-2400nm) | 1% (200-2400nm) /decade |
