Concept
Surface downwelling photosynthetic radiance in sea water
| URI | http://vocab.nerc.ac.uk/standard_name/surface_downwelling_photosynthetic_radiance_in_sea_water/ | ||
|---|---|---|---|
| Within Vocab | Climate and Forecast Standard Names | ||
| Definition | The surface called "surface" means the lower boundary of the atmosphere. Downwelling radiation is radiation from above. It does not mean "net downward". The sign convention is that "upwelling" is positive upwards and "downwelling" is positive downwards. Radiance is the radiative flux in a particular direction, per unit of solid angle. The direction from which it is coming must be specified, for instance with a coordinate of zenith_angle. If the radiation does not depend on direction, a standard name of isotropic radiance should be chosen instead. "Photosynthetic" radiation is the part of the spectrum which is used in photosynthesis e.g. 400-700 nm. The range of wavelengths could be specified precisely by the bounds of a coordinate of radiation_wavelength. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. | ||
| Date | None | ||
| Note | accepted | ||
| modified | 2018-07-03 16:09:23.0 | ||
| Broad Match | P02:VSRW |
Visible waveband radiance and irradiance measurements in the water column | |
| P04 Global Change Master Directory Science Keywords V5 - (2) | |||
| P64 Global Change Master Directory Science Keywords V6 - (2) | |||
| Exact Match | http://mmisw.org/ont/cf/parameter/surface_downwelling_photosynthetic_radiance_in_sea_water | ||
| http://vocab.nerc.ac.uk/standard_name/surface_downwelling_photosynthetic_radiance_in_sea_water/ | |||
P07:CFSN0288 |
surface_downwelling_photosynthetic_radiance_in_sea_water | ||
| Related | P06:WMSS |
Watts per square metre per steradian | |
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