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Durand, Loyal, Jr. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXXI (1938)

Whitney, Lester V.
Continuous solar radiation measurements in Wisconsin lakes,   pp. 175-200 PDF (7.7 MB)

Page 175

 From the Limnological Laboratory of the Wisconsin Geological and 
Natural History Survey. Notes and reports No. 69. INTRODUCTION 
 The Wisconsin Geological and Natural History Survey has carried on work
for several years on the relations existing between sunlight penetration
and the waters of small lakes. Four reports have been published and other
material is on hand. Numerous observations have been made on the quantity
of light energy delivered to the surfaces of the lakes; on its transmission
to various depths; and on the solar energy spectrum as found in air and as
modified by its passage through lake waters of various types. In general,
observations in the past have been made in the direct sunshine and during
the middle hours of the day. 
 The Survey is also investigating the quantitative utilization of solar energy
by lake algae and other aquatic plants in the manufacture of organic matter.
These studies call for quantitative determinations of light in lake waters
under a wider range of conditions than studied heretofore, and records for
the entire day are needed. Such records show the effect of different elevations
of the sun, of diffuse light as met with on cloudy days, of color or turbidity
of lake water, and of varying surface of the lake in wind and calm. The following
report deals with the continuous solar radiation records obtained during
the summers of 1935 and 1936. 
 Automatic Double Recorder. The Survey began a study during July and August
1935 at the Trout Lake Limnological Laboratory with apparatus which furnished
continuous automatic rec 
 * This investigation was supported by a grant from the Brittingbam Trust

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