title: Dynamic coupling of photoacclimation and photoinhibition in a model of microalgae growth.
abstract: The development of mathematical models that can predict photosynthetic productivity of microalgae under transient conditions is crucial for enhancing large-scale industrial culturing systems. Particularly important in outdoor culture systems, where the light irradiance varies greatly, are the processes of photoinhibition and photoacclimation, which can affect photoproduction significantly. The former is caused by an excess of light and occurs on a fast time scale of minutes, whereas the latter results from the adjustment of the light harvesting capacity to the incoming irradiance and takes place on a slow time scale of days. In this paper, we develop a dynamic model of microalgae growth that simultaneously accounts for the processes of photoinhibition and photoacclimation, thereby spanning multiple time scales. The properties of the model are analyzed in connection to PI-response curves, under a quasi steady-state assumption for the slow processes and by neglecting the fast dynamics. For validation purposes, the model is calibrated and compared against multiple experimental data sets from the literature for several species. The results show that the model can describe the difference in photosynthetic unit acclimation strategies between Dunaliella tertiolecta (n-strategy) and Skeletonema costatum (s-strategy).
authors.affiliation: Centre for Process Systems Engineering (CPSE), Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK; Sorbonne Universités, UPMC Univ Paris 06, France; CNRS, UMR 7093, LOV, Observatoire Océanologique, F-06230 Villefranche sur Mer, France.
authors.forename: Andreas
authors.initials: A
authors.lastname: Nikolaou
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, France; CNRS, UMR 7093, LOV, Observatoire Océanologique, F-06230 Villefranche sur Mer, France; BIOCORE-INRIA, BP93, 06902 Sophia-Antipolis Cedex, France.
authors.forename: Philipp
authors.initials: P
authors.lastname: Hartmann
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, France; CNRS, UMR 7093, LOV, Observatoire Océanologique, F-06230 Villefranche sur Mer, France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Sciandra
authors.affiliation: Centre for Process Systems Engineering (CPSE), Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
authors.forename: Benoît
authors.initials: B
authors.lastname: Chachuat
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, France; CNRS, UMR 7093, LOV, Observatoire Océanologique, F-06230 Villefranche sur Mer, France; BIOCORE-INRIA, BP93, 06902 Sophia-Antipolis Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Bernard
mesh_terms: D000465:Algorithms; D002734:Chlorophyll / Q000378:metabolism; D007700:Kinetics; D008027:Light; D058086:Microalgae / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D008954:Models, Biological; D010788:Photosynthesis / Q000528:radiation effects
chemical_list: D002734:Chlorophyll
keywords: Acclimation strategy; Droop model; Han model; Microalgae; PI curves; Photosynthesis modeling