Durand, Loyal, Jr. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXXI (1938)
James, Harry Raymond; Birge, Edward A.
A laboratory study of the absorption of light by lake waters, pp. -154 PDF (46.6 MB)
152 Wisconsin Academy of Sciences, Arts, and Letters 3. Percentile absorption, as determined for the present re port, is compared with that found in Wisconsin lakes by Pietenpol some 15 years earlier. The general character of the lake waters and of their action on light seems to be fairly constant. Comparison is also made with determinations made on German lakes by von Aufsess and on a Minnesota lake by Erikson. Their results can be interpreted by the results from the larger series of Wisconsin lakes. Section 4. Figs. 19-28; pp. 78-98 1. This section contains 8 diagrams, Figs. 19-26, which illusstrate the effect of settling, filtering, and dilution on light absorption by the waters of individual lakes. They show the behavior of the waters from the three Groups defined above, when subjected to these treatments. This behavior is discussed for each diagram. 2. Figs. 27, 28 contain absorption curves for settled or fil tered lake waters whose effect on light was read to 3650 A. They show the same characteristics as do those for the smaller spectral range, but in a more extreme form. CHAPTER IV - 1. In this chapter there is attempted an elementary analysis of the action of lake waters on light. The total effect of a water is divided between two or more factors; and approximate quantitative values are assigned to them. Three methods are presented of such distribution of total action; each yields curves of a different type; the results are given in diagrams rather than in numerical tables. In all cases the unit for the action of water is a stratum one meter in thickness. 2. The ordinates for remainder curves are derived from those for a percentile absorption curve by subtracting the absorption ordinates of pure water. The resulting curve shows a relatively high percentile absorption in the short-wave spectrum, its amount depending primarily on the color of the water. Absorption becomes less in the long-wave spectrum and is small or negligible, 7400-8000 A. Remainder curves also show for any lake water the percentile absorption which is added to that of water by all other factors combined. In this computation ab
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