Predicting End-of-Summer Oxygen Profiles in Stratified Lakes

Authors:
  • LML. A. Molot
    L. A. Molot
  • PDP. J. Dillon
    P. J. Dillon
  • BCB. J. Clark
    B. J. Clark
  • BNB. P. Neary
    B. P. Neary
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Abstract
Mean end-of-summer dissolved oxygen profiles in the hypolimnion of oligotrophic and oligomesotrophic thermally stratified lakes were accurately predicted with a multivariate regression model. The model integrates the effects of lake morphometry, total phosphorus concentration (TP), and initial O2 concentrations at spring turnover to predict mean end-of-summer O2 concentration within individual hypolimnetic strata. Lake morphometry exerts a large influence on O2 profiles and this influence is particularly evident in shallow (< 20 m maximum depth) oligotrophic lakes. Predictions of O2 profiles are sensitive to changes in TP concentrations, with all study lakes predicted to have severely O2-depleted hypolimnions by the end of summer at an epilimnetic TP of only 15 μg∙L−1.

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