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Natural radon and phosphorus as limnologic tracers: Horizontal and vertical eddy diffusion in Greifensee

1978; Wiley; Volume: 23; Issue: 1 Linguagem: Inglês

10.4319/lo.1978.23.1.0077

1939-5604

Dieter M. Imboden, Steve Emerson,

Climate variability and models

Two‐dimensional interpretation of monthly measurements of natural radon‐222 at different stations in Greifensee, Switzerland, results in hypolimnetic vertical and horizontal eddy diffusion coefficients ( K z and K x ) of 0.2–0.05 and 1,000–100 cm 2 s −1 during the stagnation period in 1975. Application of the one‐dimensional and three‐dimensional horizontally well mixed models to the data from the midlake station produces errors of about a factor of two in the vertical eddy diffusion coefficient. With the hypolimnion mixing information, K z in the thermocline is estimated to be 0.025 ± 0.015 cm 2 s −1 by using dissolved phosphorus as a quasi‐conservative tracer. The eddy diffusion coefficients calculated are in good agreement with those which would be predicted by empirical methods. The results when applied to phosphorus cycling indicate that P reflux from the hypolimnion and thermocline in eutrophic Greifensee is of the same magnitude as external inputs during the months of maximum photosynthesis.