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Proceedings Paper

Characterization Of Downwelling Spectral Irradiance Fluctuations
Author(s): David A Slegel; T D Dickey
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Paper Abstract

Profiles of downwelling spectral irradiance fluctuation (e1(z,λ)) are determined from data taken during the Optical Dynamics Experiment in the North Pacific Ocean. These vertical profiles are based upon values of e'(z,X), defined as the root mean square deviations of the instantaneous irradiance from the smoothed (9m running mean) irradiance. Time scales associated with these deviations range from ~1 to 13s and are probably associated with surface gravity wave processes. Vertical variations of attenuating materials are minimal as data are from the upper mixed layer (upper 50m). Profiles indicate that e'(z,λ) decreases nearly exponentially with depth and can be modeled with the form e'(z,λ) = A(λ) exp(-B(X)z). This simple expression accounts for at least 90% of the observed vertical variations of ei(z,λ). The ensemble mean A(λ) is roughly 5% of the mean spectral irradiance just beneath the sea surface. The mean B(λ) varies from about 1 to 2 times the mean diffuse spectral attenuation coefficient, with the largest values occurring for the most penetrating wavelengths of light. Possible mechanisms contributing to the observed variations and their relationships with other parameters are discussed.

Paper Details

Date Published: 12 August 1988
PDF: 9 pages
Proc. SPIE 0925, Ocean Optics IX, (12 August 1988); doi: 10.1117/12.945710
Show Author Affiliations
David A Slegel, University of Southern California (United States)
T D Dickey, University of Southern California (United States)


Published in SPIE Proceedings Vol. 0925:
Ocean Optics IX
Marvin A. Blizard, Editor(s)

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