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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 9 — Sep. 26, 2007

Effects of cosine error in irradiance measurements from field ocean color radiometers

Giuseppe Zibordi and Barbara Bulgarelli  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 5529-5538 (2007)

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The cosine error of in situ seven-channel radiometers designed to measure the in-air downward irradiance for ocean color applications was investigated in the 412 683   nm spectral range with a sample of three instruments. The interchannel variability of cosine errors showed values generally lower than ± 3 % below 50 degrees incidence angle with extreme values of approximately 4–20% (absolute) at 50–80 degrees for the channels at 412 and 443   nm . The intrachannel variability, estimated from the standard deviation of the cosine errors of different sensors for each center wavelength, displayed values generally lower than 2% for incidence angles up to 50 degrees and occasionally increasing up to 6% at 80 degrees. Simulations of total downward irradiance measurements, accounting for average angular responses of the investigated radiometers, were made with an accurate radiative transfer code. The estimated errors showed a significant dependence on wavelength, sun zenith, and aerosol optical thickness. For a clear sky maritime atmosphere, these errors displayed values spectrally varying and generally within ± 3 % , with extreme values of approximately 4–10% (absolute) at 40–80 degrees sun zenith for the channels at 412 and 443   nm . Schemes for minimizing the cosine errors have also been proposed and discussed.

© 2007 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(120.5630) Instrumentation, measurement, and metrology : Radiometry

ToC Category:
Atmospheric and ocean optics

Original Manuscript: February 28, 2007
Revised Manuscript: May 29, 2007
Manuscript Accepted: June 3, 2007
Published: July 31, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

Giuseppe Zibordi and Barbara Bulgarelli, "Effects of cosine error in irradiance measurements from field ocean color radiometers," Appl. Opt. 46, 5529-5538 (2007)

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