Characterization Of Downwelling Spectral Irradiance Fluctuations

David A Slegel; T D Dickey

doi:10.1117/12.945710

12 August 1988 Characterization Of Downwelling Spectral Irradiance Fluctuations

David A Slegel, T D Dickey

Proceedings Volume 0925, Ocean Optics IX; (1988) https://doi.org/10.1117/12.945710
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

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.

Citation Download Citation

David A Slegel and T D Dickey "Characterization Of Downwelling Spectral Irradiance Fluctuations", Proc. SPIE 0925, Ocean Optics IX, (12 August 1988); https://doi.org/10.1117/12.945710

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