Marine Biology

, Volume 114, Issue 2, pp 341–348

Laboratory simulation of light-focusing by water-surface waves

  • D. Stramski
  • L. Legendre
Article

Abstract

A laboratory system has been developed to simulate wave-induced irradiance fluctuations that occur in the top few metres of the sea under sunny surface conditions. A principle of operation is that the fluctuations are produced after refraction of light by water waves generated in the tank. Simulated irradiance consists of repetitive high-amplitude “flashes” resulting from a lens-effect of the waves. Statistical properties of flashes are similar to those recorded at sea. In our laboratory simulation, the flashes that exceed an amplitude level of 1.5 Ē (where Ē is the time-averaged irradiance) have a mean frequency of about 230 min-1, and a typical duration of 5 to 20 ms. The frequency of the flashes decreases exponentially with increasing amplitude level. The system simulates timeaveraged irradiance comparable to full sunlight at shallow depths (∼800 μmol quanta m-2 s-1 over the visible spectral region), and provides light with a reasonable spectral composition. The simulation method was designed for studying responses of phytoplankton, but applications involving optical aspects can also be foreseen.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • D. Stramski
    • 1
  • L. Legendre
    • 1
  1. 1.Département de BiologieUniversité LavalCanada
  2. 2.Department of Biological SciencesUniversity of Southern CaliforniaLos AngelesUSA

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