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Abstract In the context of Kirk’s radiative transfer theory under the assumption that a mirror surface water column has no internal light source and elastic scattering, an investigation was conducted on the effect of the solar altitude angles on the depth of euphotic layer in Taihu Lake. Evidences showed that the ratio of scattering to absorption coefficients (b/a) was the key factor to determine the extent of the above effect, which would be smaller and even be neglected if the ratio (b/a) reached to 15 or larger. As for the autumn season, due to the fact that the ratio (b/a) was relatively smaller (larger) in the entire lake, the solar altitude angle effect should be taken into account (ignored) in the short-wave (long-wave) band of 400~540nm (540~700nm).
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Received: 14 December 2010
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