Warming Oceans May Trigger Methane Feedback Loop, Accelerating Climate Change

University of Rochester scientists uncover a mechanism that could amplify methane emissions from the open ocean as the planet warms.

Apr. 10, 2026 at 3:10am

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An abstract, highly structured painting in muted tones of blue, green, and gray, featuring sweeping geometric arcs, concentric circles, and precise spirals, visually representing the intricate scientific forces and concepts behind the ocean's methane feedback loop.A conceptual illustration of the complex ocean feedback loop that could accelerate climate change through increased methane emissions.Rochester Today

A new study published in the Proceedings of the National Academy of Sciences reveals that certain ocean bacteria produce methane as a byproduct when nutrients like phosphate are scarce. As climate change warms the oceans, this process could intensify, creating a harmful feedback loop where more methane is released into the atmosphere, driving further warming.

Why it matters

Methane is a powerful greenhouse gas, and this newly discovered mechanism for methane production in oxygen-rich ocean environments is not currently included in major climate models. Incorporating this feedback loop could be essential for accurately predicting the pace and scale of future climate change.

The details

The researchers, led by University of Rochester associate professor Thomas Weber, found that certain bacteria generate methane when breaking down organic compounds, but only when phosphate is scarce. As climate change warms the oceans, it is expected to slow the vertical mixing that carries nutrients like phosphate up from the ocean depths, potentially creating ideal conditions for these methane-producing microbes to thrive in surface waters.

  • The study was published in the Proceedings of the National Academy of Sciences in April 2026.

The players

Thomas Weber

An associate professor in the Department of Earth and Environmental Sciences at the University of Rochester and the lead author of the study.

Shengyu Wang

A graduate student in Weber's lab and a co-author of the study.

Hairong Xu

A postdoctoral research associate in Weber's lab and a co-author of the study.

University of Rochester

The institution where the research was conducted.

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What they’re saying

“This means that phosphate scarcity is the primary control knob for methane production and emissions in the open ocean.”

— Thomas Weber, Associate Professor, Department of Earth and Environmental Sciences, University of Rochester

“Climate change is warming the ocean from the top down, increasing the density difference between surface and deep waters. This is expected to slow the vertical mixing that carries nutrients like phosphate up from depth.”

— Thomas Weber, Associate Professor, Department of Earth and Environmental Sciences, University of Rochester

“Our work will help fill a key gap in climate predictions, which often overlook interactions between the changing environment and natural greenhouse gas sources to the atmosphere.”

— Thomas Weber, Associate Professor, Department of Earth and Environmental Sciences, University of Rochester

What’s next

Researchers plan to continue studying this mechanism and incorporate it into climate models to improve the accuracy of future climate change predictions.

The takeaway

This study highlights how even microscopic-level processes in the ocean can have significant global consequences, underscoring the need to better understand and account for complex environmental feedback loops in order to address the challenges of climate change.