Measurement and model simulation of sun stimulated chlorophyll fluorescence within a daily cycle |
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| Institution: | 1. School of Rehabilitation Therapy, Queen''s University, Kingston, Canada;2. Department of Physical Therapy, University of Toronto, Toronto, Canada;3. Canadian Donation and Transplantation Research Program, Edmonton, Canada;4. School of Physical and Occupational Therapy, McGill University, Montreal, Canada;5. Translational Research in Respiratory Diseases Program, Research Institute of the McGill University Health Centre, Montreal, Canada;6. Centre for Outcomes Research and Evaluation (CORE), Research Institute of the McGill University Health Centre, Montreal, Canada;7. Rehabilitation Sciences Institute, University of Toronto, Toronto, Canada;8. Department of Occupational Therapy and Occupational Science, University of Toronto, Toronto, Canada;9. Department of Rehabilitation Services, Hospital for Sick Children (SickKids), Toronto, Canada |
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| Abstract: | Radiance spectra of the water surface were recorded from an anchored ship during one clear day to observe the efficiency of sun light stimulated fluorescence of phytoplankton chlorophyll in the Baltic Sea. The fluorescence was calculated as the radiance at 685 nm above a linear baseline, constructed from L(645) and L(724). For a chlorophyll concentration range of 2.5 – 4.0 μg/l a strong linear correlation was found. The result is confirmed by simulation of the experiment with a radiative transfer model. A fluorescence efficiency of 0.3% of the scalar irradiance, absorbed by phytoplankton, is derived, which does not change with sun elevations above 20°. |
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