Concept
Surface downwelling photosynthetic photon flux in air
| URI | http://vocab.nerc.ac.uk/standard_name/surface_downwelling_photosynthetic_photon_flux_in_air/ | ||
|---|---|---|---|
| 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. "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. A photon flux is specified in terms of numbers of photons expressed in moles. 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:VSRA |
Visible waveband radiance and irradiance measurements in the atmosphere | |
| 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_photon_flux_in_air | ||
| http://vocab.nerc.ac.uk/standard_name/surface_downwelling_photosynthetic_photon_flux_in_air/ | |||
P07:CFSN0284 |
surface_downwelling_photosynthetic_photon_flux_in_air | ||
| Related | P06:M2MS |
Moles per square metre per second | |
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