PNAS Science Sessions15 Sep 2025

How climate change alters lake oxygen levels

Climate change and lake oxygenation

Science Sessions are brief conversations with cutting-edge researchers, National Academy members, and policymakers as they discuss topics relevant to today's scientific community. Learn the behind-the-scenes story of work published in the Proceedings of the National Academy of Sciences (PNAS), plus a broad range of scientific news about discoveries that affect the world around us.

In this episode, Joachim Jansen explains how climate change altered cycles of oxygenation in lakes.

In this episode, we cover:
•[00:00] Introduction.
•[00:56] Limnologist Joachim Jansen introduces us to the cycles of oxygenation in lakes throughout the seasons.
•[02:35] He describes previous hypothesis about climate change and lake oxygenation and introduces the methods and datasets of the study.
•[04:59] Jansen introduces the results of the study, including key differences between large and small lakes.
•[06:54] He talks about the consequences of deoxygenation.
•[09:03] Jansen explains the caveats and limitations of the study.
•[09:37] Conclusion.

About Our Guest:

Joachim Jansen
Postdoctoral Researcher
University of Helsinki

View related content here: https://www.pnas.org/doi/10.1073/pnas.2426140122

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