海水中の懸濁質に関する研究-IV : 懸濁質係数と消散係数および濁度との関係

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The authors previously reported an equation μ=aT-b, where μ is extinction coefficient of incident light into a suspension, T visible transparency depth of Secchi-disc and a, bconstants. “a” can be an index of the particle size, as far as “b” remains to be a certain value though it varies by the quality of suspended material. In the sea water, the value of b was recognized to be 0.3 in neritic and even in oceanic waters. So “a”, the suspension factor, of various sea regions can be comparable to each other and is observed to be a good indicator of the condition for the growth of filter-feeders there, and recently a-Cl number, combined “a” value with Cl‰, was showed to be a better index for it. When T cant be observed, “a” is obtained as follows from the values of μ and τ, Turbidity, in situ. Generally in the suspensions of such particles as their size is of the same order to the wave-length of incident-light or slightly larger, there is a relation μ=kSα, where S is the concentration of particles, α is a constant, 0.2 in sea waters, neritic and oceanic, and k a parameter which varies with the value of “a”, according to the relation k=0.64a-0.055. While theoretically there is a relation τ=γS, where γ is a parameter which varies with the particle diameter. From these two eqs. we can obtain μ=kτ0.2, wrere k=kγ-0.2. This relation was recognized to be in good fit with many data hitherto obtained actually by assuming k=0.72a-0.04. And we obtain a=1.38μτ-0.2+0.056 according to which “a” can be obtained even by layers in the sea from μ and τ without T. Applying the value of γ computed theroretically by Burt under the condition that the wave-length is 550mμ and refraction coefficient between particle and water 1.15, the diameters of particles by “a” values were tried to obatin from the eq. γ=(0.64a-0.055/0.72a-0.040)5, resulting the diameters of 2-5μ in usual bay-waters in Japan, as shown in figures.

海水中の懸濁質に関する研究-IV : 懸濁質係数と消散係数および濁度との関係

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