Photosynthetic parameters Marcel Babin

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Photosynthetic parametersMarcel Babin
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measured variables

• Photosynthetic parameters derived from P vs. E
  (14C) curves (10 depths, 1L)
• Parameters derived from measurements of variable
  fluorescence
• discrete samples PAM (10 depth, 100ml)
• in situ measurements FRRF

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P vs E curve
P Pmax tanh(PAR /Ek)
Ek Pmax /a
Fcmax a / 12 a
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PROSOPE
Bruyant, 2002
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Photo-physiological parameters might be dependant
on phytoplankton community composition (POMME
results)
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• More easy to parameterise than a dependence on
  environmental variables (T, Nutrient and light)

• Potential applications for bio-optical models

• Besides P vs E measurements Absorption, HPLC
  pigments, and 14C primary production (other
  approach to test the dependence of carbon
  fixation efficiency on taxonomic composition)

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Parameters deduced from variable fluorescence
measurements on discrete samples and in situ.
fPS2 (Fm Fo ) / Fm sPS2