Observing and Understanding the Dynamics of Algal Photosynthesis and Respiration
Beck, M. B.
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Experimental manipulations of an aquaculture pond have been observed using the University of Georgia's Environmental Process Control Laboratory. The data, which are comprehensive, cover a continuous five-month period with a very high sampling frequency (of the order of minutes); variables observed include solar radiation, several nitrogen species, orthophosphate-P, chlorophyll-a, dissolved oxygen, and pH. A small portion of these data -- for a period of some 15 days in August, 2000 -- are examined in detail. The goal is to extract the periodic (diurnal) components of the observed time-series signals, using recursive estimation algorithms, with a view to identifying significant matches and differences among the phases of these extracted components. Ultimately, the objective is to observe and understand the fast dynamics of algal photosynthesis and respiration in situ; our contention is that clearly identifying phase differences among the diurnal signal fluctuations contributes substantially to reaching this goal.