Ventilation and dissolved oxygen cycle in Lake Superior: Insights from a numerical model

Katsumi Matsumoto, Kathy S. Tokos, Chad Gregory

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Ventilation and dissolved oxygen in Lake Superior are key factors that determine the fate of various natural and anthropogenic inputs to the lake. We employ an idealized age tracer and biogeochemical tracers in a realistically configured numerical model of Lake Superior to characterize its ventilation and dissolved O2 cycle. Our results indicate that Lake Superior is preferentially ventilated over rough bathymetry and that spring overturning following a very cold winter does not completely ventilate the lake interior. While this is unexpected for a dimictic lake, no part of the lake remains isolated from the atmosphere for more than 300 days. Our results also show that Lake Superior's oxygen cycle is dominated by solubility changes; as a result, the expected relationship between biological consumption of dissolved O2 and ventilation age does not manifest.

Original languageEnglish (US)
Pages (from-to)3097-3110
Number of pages14
JournalGeochemistry, Geophysics, Geosystems
Volume16
Issue number9
DOIs
StatePublished - Sep 1 2015

Bibliographical note

Publisher Copyright:
© 2015. American Geophysical Union. All Rights Reserved.

Keywords

  • Lake Superior
  • ideal tracers
  • numerical model
  • oxygen
  • ventilation

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