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Fluorescence. Indirect measure of pigment concentration.
Units and collection method may vary. Units often reported in milligrams/meter^3 (mg/m3) or micromoles per liter (ug/L). Sometimes reported after being calibrated against extracted pigment concentrations.
In JGOFS/GLOBEC projects fluorescence is measured from CTD instrument sensor.
Relative fluorescence measured by the fluorometer on the Niskin rosette sampler converted to mg Chl a L-1 using a regression equation based on extracted chlorophyll data: chl a = 1.7869RF - 2.2541; R^2 = 0.83