Lidar in situ study of sunlight regulation of phytoplankton photosynthetic activity and chlorophyll fluorescence

M. Yu Gorbunov, A. M. Chekalyuk

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

Abstract

Mechanisms of solar illumination influence on phytoplankton chlorophyll-a fluorescence and photosynthetic activity were investigated in situ by means of lidar implementation of pump-and-probe technique. It has been found that for subsurface phytoplankton the main mechanisms of sunlight regulation were photoinhibition of primary photosynthesis processes by excessive light, dominating at illuminations more than 40 klx, and 'energy-dependent' fluorescence quenching, affecting at illuminations 5-20 klx. Potential role of another regulating mechanisms (photophosphorylation of pigment-protein complexes, spillover, xanthophyll cycle, lipids and pigments photodestruction) are discussed and analyzed.

Original languageEnglish (US)
Pages (from-to)421-427
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume1922
DOIs
StatePublished - Jun 17 1993
Externally publishedYes
EventLaser Study of Macroscopic Biosystems 1992 - Jyvaskyla, Finland
Duration: Sep 7 1992Sep 11 1992

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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