Use of the In Vivo Fluorescence Line at 685 nm for Remote Sensing Surveys of Surface Chlorophyll a

  • J. F. R. Gower
  • G. Borstad
Part of the Marine Science book series (MR, volume 13)

Abstract

In airborne surveys of coastal water the in vivo fluorescence line of chlorophyll a provides a characteristic and relatively narrow band signature for chlorophyll detection and measurement. Quantitative accuracy is limited by the varying fluorescent efficiency of different phytoplankton populations and by changes in water absorption that reduce the light available for fluorescence, but this accuracy appears adequate for many survey applications. Examples are shown of airborne measurements taken as part of the Canada France Ocean Optics Experiment (CFOX) over the Mediterranean, the coastal waters of British Columbia and the Lancaster Sound area of the eastern Canadian arctic. The fluorescence observations appear to give as useful a signal as the blue to green reflectance ratio with less uncertainty due to atmospheric scattering and surface reflection. From higher altitudes the effects of oxygen and water vapour absorption lines become important, but the line remains measurable, and mapping of the fluorescence distribution from space appears feasible.

Keywords

Chlorophyll Attenuation Phytoplankton Stratification Silt 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Austin, R.W., 1974, “Inherent Spectral Radiance Signatures of the Ocean Surface” in Ocean Color Analysis, Scripps Institution of Oceanography Report SIO Ref. 74–10.Google Scholar
  2. Clarke, G.L., Ewing G.C., and Lorenzen, C.J., 1970, “Spectra of Backscattered Light from the Sea Obtained from Aircraft as a Measure of Chlorophyll Concentration”, Science, 167, 1119–1121.CrossRefGoogle Scholar
  3. Goldberg, L., 1975, “Absorption Spectrum of the Atmosphere”, Chapter 9, p. 457 of “The Earth as a Planet”, Volume 11 of “The Solar System”, Kuiper Ed., University of Chicago Press.Google Scholar
  4. Gower, J.F.R., 1980, “Observations of In Situ Fluorescence of Chlorophyll a in Saanich Inlet”, Boundary Layer Meteorology, 18, 235–245.CrossRefGoogle Scholar
  5. Kiefer, D.A., 1973, “Fluorescence Properties of Natural Phytoplankton Populations”, Marine Biology, 22 263–269.CrossRefGoogle Scholar
  6. Morel, A., 1980, “In Water and Remote Measurements of Ocean Colour”, Boundary Layer Meteorology, 18, 177–201.CrossRefGoogle Scholar
  7. Morel, A. and Prieur, L., 1977, “Analysis of Variations in Ocean Colour”, Limnology and Oceanography, 22, 709–722.CrossRefGoogle Scholar
  8. Neville, R.A. and Gower, J.F.R., 1977, “Passive Remote Sensing of Phytoplankton via Chlorophyll a Fluorescence”, J. Geophys. Res., 82, 3487–3493.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • J. F. R. Gower
    • 1
  • G. Borstad
    • 2
  1. 1.Remote Sensing Institute of Ocean SciencesSidneyCanada
  2. 2.Seakem Oceanography Ltd.SidneyCanada

Personalised recommendations