Figure 9.3 Linear regression between the monthly entropy production (Sprod) per surface unit of Lake Trasimeno and the monthly solar energy absorbed by the lake (Qs).
entropy productions independent of solar radiation energy (per year, per m3 of the lake water) are shown in Table 9.3. The values of entropy production dependent on solar radiation in the light zone (euphotic zone) are related to the amount of dissolved organic matter and SS per m3 of lake water in the light zone. The ratio of the amount of SS in Lake Mendota to that in Lake Biwa (1:5) and the ratio of DOC in Lake Mendota to that in Lake Biwa (2:1) are consistent with the ratio of entropy production dependent on solar radiation between Lake Mendota and Lake Biwa (Table 9.3). Thus, the greater the amount of SS and DOC, the more the entropy production is dependent on solar radiation. The entropy production dependent on solar radiation gives a kind of physical measure for the
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