Temporal variations of beam attenuation coefficient on the Continental Rise off Nova Scotia Public Deposited

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  • Two separate time series observations of light transmission in the bottom water on the Continental Rise off Nova Scotia show fluctuations of light transmission in a wide range, 0-50% transmission at λ = 660 nm. The range corresponds approximately to SPM concentrations of 12 mg/l to 150 μg/l. The former is the maximum value determined by filtration (Biscaye, 1980), and the latter is determined by an empirical relation between beam attenuation coefficient and particle volume determined by a particle counter. Nepheloid layers of significant turbidity, called benthic storms, were observed in 30 and 10% of the time, respectively, for the two observations, and each storm lasted 2-5 days. High frequency fluctuations represented by pulse lengths less than 10 min were observed superimposed on the low frequency fluctuations during 16 and 4% of the time. Both the major storms and the high frequency pulses are interpreted to be a result of resuspension of bottom sediments at varying distances from the instrument; the high frequency pulses are thought to be a result of erosion at a relatively short distance, while the low frequency fluctuations result from erosion at greater distance.
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  • Pak, H., and J. Zaneveld (1983), Temporal Variations of beam attenuation coefficient on the Continental Rise off Nova Scotia, J. Geophys. Res., 88(C7), 4427-4432.
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  • Vol. 88 (1983)
  • Journal of Geophysical Research
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