Term: downwelling_shortwave_flux_in_air_assuming_clean_clear_sky

Unit: W m-2

Unit ref: UFAA

AMIP:

GRIB:

Calculated in the absence of aerosols and clouds. This requires a double-call in the radiation code with precisely the same meteorology.

Term: downwelling_shortwave_flux_in_air_assuming_clean_clear_sky

Unit: W m-2

Unit ref: UFAA

AMIP:

GRIB:

Calculated in the absence of aerosols and clouds. This requires a double-call in the radiation code with precisely the same meteorology. "shortwave" means shortwave radiation. Downwelling radiation is radiation from above. It does not mean "net downward". When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. A phrase "assuming_condition" indicates that the named quantity is the value which would obtain if all aspects of the system were unaltered except for the assumption of the circumstances specified by the condition.

Term: downwelling_shortwave_flux_in_air_assuming_clean_clear_sky

Unit: W m-2

Unit ref: UFAA

AMIP:

GRIB:

Downwelling radiation is radiation from above. It does not mean "net downward". The term "shortwave" means shortwave radiation. When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. A phrase "assuming_condition" indicates that the named quantity is the value which would obtain if all aspects of the system were unaltered except for the assumption of the circumstances specified by the condition. "Clean sky" means in the absence of atmospheric aerosol. "Clear sky" means in the absence of clouds.