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)
Introduction 9 ward such analysis would have been carried on in a different way. But it seems to the Survey that the results set forth in the diagrams of this chapter are worth presenting. It is especially hoped that they may suggest the use of new and better methods to obtain more complete analysis and quantitative results. This is only one of the many aspects of the ecology of lakes which are calling for quantification. Perhaps another one may be named, on which the study of Dr. James has given us much information that would enlarge a more detailed and accurate investigation. This is the presence, extent, origin, and variation of spectral bands of local selective absorption of radiation by the waters of lakes. This subject is not discussed in the present Report; but certain especially plain cases are pointed out in the explanations of the diagrams. The data of this report state the total percentile effect of a one-meter column of lake water (settled, filtered, or diluted) on radiant energy in the form of light. The quantity of energy in the light entering the water is compared with that emerging from it. No observations have been made, within the water itself, on the processes affecting light which go on there. Madison, Wisconsin. June 10, 1937.
This material may be protected by copyright law (e.g., Title 17, US Code).| For information on re-use, see http://digital.library.wisc.edu/1711.dl/Copyright