Original paper

Lake mixis and internal phosphorus dynamics

Osgood, Richard A.

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Archiv für Hydrobiologie Volume 113 Number 4 (1988), p. 629 - 638

30 references

published: Nov 7, 1988

DOI: 10.1127/archiv-hydrobiol/113/1988/629

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Abstract

The contribution of internal phosphorus supplies to the summertime epilimnion is related to duration and extent of mixis for lakes of the Twin Cities Metropolitan Area, Minnesota. The ratio of mean depth to the square root of surface (ž/Ao0.5) area is closely correlated with the fraction of lake volume involved in mixis and the duration of summertime mixis. Since these two factors were not measured precisely in most lakes, ž/Ao0.5 was used as a surrogate. A steady-state phosphorus model was modified by incorporating lake mixing volume and the duration of summertime stratification. This model, which replicated observations from 96 TCMA lakes, demonstrated elevated summertime surface phosphorus concentrations in polymictic lakes.

Keywords

phosphorus • lake • polymictic lakes