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  • Radiation, heat and energy

    Exceedingly important to every ecosystem is the amount of energy available for various biological, physical and chemical processes. In the case of the marine environment, the key point here is the amount of energy, the form in which it reaches the sea, and how much is released into the atmosphere. That is why parameters are introduced to describe quantitatively and qualitatively the transformations of energy in the sea, and also the balances of these transformations. Some of these magnitudes are given in the SatBałtyk System.

    Products in group

    Net shortwave irradiance

    Net shortwave irradiance SWNET The difference between the downward SWd and upward SWu flux of shortwave irradiance in the 300-4000 nm wavelength range. Values

    Radiation budget NET

    Radiation budget NET The difference between the downward shortwave SWd longwave irradiance energy flux - LWd and the upward fluxes of SWu and LWu in the

    Upward longwave irradiance LWu

    Upward longwave irradiance LWu The energy flux density  (upward vector irradiance [1]) of thermal radiation emitted by the sea surface and

    Upward shortwave irradiance SWu

    Upward shortwave irradiance SWu The energy flux density (upward vector irradiance [1]) of solar radiation reflected from the water surface and

    Downward longwawe irradiance LWd

    Downward longwave irradiance LWd The surface energy flux density (downward vector irradiance [1]) of heat radiation emitted by the atmosphere within the

    Downward shortwave irradiance SWd

    Downward shortwave irradiance SWd The energy flux density (downward vector irradiance [1]) of direct solar radiation and that scattered in the

    Net longwave irradiance LWnet

    Net longwave irradiance LWnet The difference between the downward LWd and upward LWu long-wave radiation in the 4-100 µm wavelength range. Values are expressed

    Daily total of PAR

    Fig.1 Instantaneous distribution of daily total PAR at the surface of the Baltic Sea Fig.2  Comparison of measured (Oceania) and modelled

    Daily total of shortwave radiation

    Daily total of shortwave radiation Fig.1 Distribution of the daily dose of solar radiation incident on the surface of the Baltic

    Short-wave solar radiation

    Fig.1 Instantaneous distribution of irradiance at the surface of the Baltic Sea Fig.2 Areas where total solar radiation was measured from

    Photosynthetically active radiation (PAR) at the sea surface

    Rys.1 Instantaneous distribution of photosynthetically active radiation (PAR) at the surface of the Baltic Sea Rys.2 Comparison of measured (Oceania) and modelled

    Photosynthetically Utilized Radiation

    Photosynthetically Utilized Radiation This is the sum of light energy (expressed in megajoules) absorbed by phytoplankton in the entire water column

    Part of PUR due to photosynthetic pigments

    Part of PUR due to photosynthetic pigments This is the sum of the light energy (expressed in megajoules) absorbed only by

    Photosynthetically Stored Radiation

    This is the energy (expressed in megajoules) accumulated in organic matter as a result of the photosynthesis of phytoplankton in

    Surface fluxes of heat/radiation

    Maps of latent and sensible heat fluxes, as well as downward fluxes of short- and long-wave radiation over the Baltic