POSTER Session 3

PHOTOSYNTHETIC PARAMETERS ESTIMATED FROM IN SITU PRIMARY PRODUCTION PROFILES USING BOOTSTRAPPING OF OPTICAL DATA

Photosynthesis parameters, the initial slope and the assimilation number, are used in the photosynthesis irradiance functions to define the photosynthetic rate at high and low light intensities. Their values are typically estimated from in vitro primary production experiments, but recently inverse numerical techniques were developed for the estimation of photosynthesis parameters from in situ primary production measurements. We implemented six in situ primary production experiments using the 14C methodology along with chlorophyll measurements, in the South Adriatic Sea. The aim of this study was to apply inverse modeling to the measured in situ profiles in order to estimate photosynthesis parameters. Given there were no optical measurements available at the time of primary production experiments, we conducted a numerical experiment using bootstrapping with the distributions of the diffuse attenuation coefficient and surface irradiance taken from other measurements in the region. The parameter estimation therefore resulted in the distributions of the initial slope and the assimilation number. We observed that the inverse model applied in this manner is efficient in retrieving photosynthetic parameters from in situ data which result with small model error. The estimated parameters can further be used in biological models and satellite remote sensing algorithms.

*Antonija Matek, Faculty of Science, University of Zagreb, Croatia, [email protected], https://orcid.org/0000-0002-2063-3417

Zrinka Ljubešić, Department of Biology, Faculty of Science, University of Zagreb, Croatia, [email protected]

Žarko Kovač, Department of Physics, Faculty of Science, University of Split, Croatia, [email protected]

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