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Proceedings Paper

Diel variability of in vivo chlorophyll fluorescence in near-surface water layer
Author(s): Alexander M. Chekalyuk; M. Yu. Gorbunov
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Paper Abstract

The analysis of diel variations in fluorescence yield of chlorophyll-(alpha) (Chl-(alpha) ) in vivo is presented in the paper. We rely on recent field observations and laboratory studies, as well as on the biophysical description of the relationship between photosynthesis and Chl- (alpha) fluorescence. The variations in fluorescence yield due to `instant' changes and diurnal variations in ambient irradiance can be explained as the manifestations of `photochemical' and `non-photochemical' quenching of Chl-(alpha) fluorescence, respectively. Field studies of the diel variability in Chl-(alpha) fluorescence were carried out with a shipborne lidar system in the Baltic, Mediterranean, and Black Seas, and in the Atlantic Ocean. As predicted by the model, we observed the maximal values of Chl-(alpha) fluorescence yield in the near-surface layer at night and its decrease in the noon. The max/min ratio varied from 3 to 1, depending on environmental conditions and, thus, on the functional state of photosynthetic apparatus. Non-photochemical mechanisms of `photoinhibitory' and energy-dependent quenching were found to be the major mechanisms of regulation of Chl-(alpha) fluorescence yield at a diurnal scale.

Paper Details

Date Published: 26 October 1994
PDF: 12 pages
Proc. SPIE 2258, Ocean Optics XII, (26 October 1994); doi: 10.1117/12.190057
Show Author Affiliations
Alexander M. Chekalyuk, Moscow State Univ. (Russia)
M. Yu. Gorbunov, Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 2258:
Ocean Optics XII
Jules S. Jaffe, Editor(s)

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