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

Whitney, Lester V.
Microstratification of inland lakes,   pp. 155-173 ff. PDF (5.7 MB)

Page 166

 166 Wisconsin Academy of Sciences, Arts, and Letters 
SEPT. 3 SEPT. 26 OCT. 8. 
 I I 
' p 
SEPT 28 
FIG. 6-. Transparency curves for Lake Mendota. 
in the shallower water near shore should be closer the surface. On Oct. 8,
with the lake much calmer, there was less difference in depth between first
minima for the two curves. A comparison between the four curves taken Sept.
26 and Oct. 8 shows more similarity between curves taken at the same station
than between curves taken on the same day. 
 Scattering. Several sets of transparency and scattering readings were taken,
and Figure 7 shows a typical pair. Notice that the transparency readings
in the lower water again were so small that the sensitivity had to be made
about 20 times larger than for readings taken above. 
 The more scattering particles there are in water, the lower the transparency
should be and the higher the scattering. The curves for the lower water show
some of the expected antisymmetrical characteristics. For example, the transparencey
minimum at 19.3 m. is matched by a scattering maximum; the transparency maximum
at 20.2 m. is matched by a less pronounced scattering minimum. However, the
sudden and permanent decrease in transparency at about 17 m. is not accompanied
by a permanent rise in scattering. The scattering does increase at 

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