Observations of natural fluorescence with an underwater radiometer |
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| Authors: | James C Kitchen Hasong Pak |
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| Institution: | (1) Present address: College of Oceanography, Oregon State University, 97331 Corvallis, OR, USA;(2) Sea Tech, Inc., P. O. Box 779, 97339 Corvallis, OR, USA |
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| Abstract: | Measurements of subsurface irradiance spectra in the ocean consistently indicate intensities of long-wavelength visible light (  589 nm) greater than could be derived from the penetration of sunlight. This can be attributed to natural fluorescence and/or to spectral crosstalk due to light leakage through the blocking filters of each discrete detector. A comparison of observed profiles with modelled contributions from these two possible sources indicates that both factors are contributing. At 671 and 694 nm wavelength, the excess signal appears to be predominantly fluorescence while that at 589 nm is mostly crosstalk. Both effects appear to be important at 625 nm although the amount of excess light is small compared to the other wavelengths.The above observations and interpretations are consistent with the optical design of the instrument used and the shape of natural irradiance spectra. Fluorescence efficiencies derived from the irradiance measurements correlate well with measuredin situ fluorescence. |
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