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The 'truth at sea' measurements are directed at the optical characterization of the bio-geo-mass and consist of measurement of absorption of visible light and of fluorescence of the total particles (TPM), of the photosynthetic pigments, the colored dissolved matter (CDOM), as well as at the degrees of concentration of parameters of relevant variable (dissolved organic carbon - DOC) and negligible (heavy metals) optical content (pigments and particles).

Passive long-distance observation of the TPM by satellite implies that it has an appreciable optical content in terms of absorption, diffusion and reflection of visible light. TPM (Total Particulate Matter), also known as TSS or TSM is subdivided into: Waste (organic and inorganic) and Phytoplankton.

TPM is measured with optical methods, from which is derived the coefficient of absorption in the UV-Visible spectrum, such as: total suspended matter; such as chlorophyllous pigments and organic and inorganic waste after de-pigmentation. This method of measurement will be the subject of extensive study in this chapter. Chemico-physical and biological analyses are normally carried out on TPM, such as, above all, the dry weight, the content of nitrogen, organic and inorganic carbon, 'light' metals' (Si, Al,. K, Ca., etc.) and, sometimes, for specific purposes, of heavy metals (Cu, CD, Pb, Zn). The physical-biological analyses carried out enable the content of chlorophyll and accessory pigments to be obtained using the high-pressured liquid chromatography method (HPLC), algal classification and the dimensional distribution of particles made with a Coulter Counter. er.

Additional information

Bibliographic Reference: Article: Telerilevamento ed Ecologia Marina dal Problema All'applicazione, pp: 209-225
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