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Study published in Proceedings of the National Academy of Sciences indicates that ocean warming can reduce nutrient mixing, decrease surface phosphate, and favor microbes capable of releasing methane in the open ocean, creating a possible feedback loop with an impact on climate change.
Ocean warming can amplify a little-seen source of methane in the open ocean and create a feedback loop capable of intensifying climate change. A study published in the Proceedings of the National Academy of Sciences indicates that microbes can produce the gas when phosphate is scarce in surface waters.
The research was conducted by scientists from the University of Rochester, including Thomas Weber, associate professor in the Department of Earth and Environmental Sciences, graduate student Shengyu Wang, and postdoctoral researcher Hairong Xu. The work identified a process that could gain strength as global temperatures rise.
Methane is a potent greenhouse gas with a high capacity to trap heat in the atmosphere. The central concern of the study is that warmer oceans can favor conditions for greater release of this gas, increasing pressures already associated with global warming.
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Ocean warming may favor methane emissions
Ocean surface waters regularly release methane into the atmosphere, even though they are rich in oxygen. This behavior has long puzzled scientists, because methane formation is usually associated with oxygen-free environments, such as swamps or deep-water sediments.
The new research helps explain this apparent contradiction. The team combined global data and computer simulations to analyze how methane can be produced in the open ocean, even in oxygenated regions.
The study indicates that certain microbes can generate methane by decomposing organic matter. This process occurs mainly when phosphate, an essential nutrient, is lacking in surface waters.
Thomas Weber states that phosphate scarcity is the main controlling factor for methane production and emissions in the open ocean. The discovery changes how this process is understood in marine environments.
Lack of phosphate changes understanding of the process
Methane generation in oxygen-rich waters may not be rare. It can occur widely in areas where phosphate levels are low, which increases the phenomenon’s importance for climate studies.
Phosphate reaches surface waters mainly through vertical mixing between deep layers and the surface. This nutrient transport is essential for maintaining the balance of various biological processes in the ocean.
As climate change progresses, this balance may be altered. Ocean warming occurs from top to bottom and increases the density difference between surface waters and deeper layers.
This greater density difference tends to reduce vertical mixing. With less circulation between layers, less phosphate is carried from the depths to the surface.
The model developed by the team shows that this scenario can make surface waters increasingly poor in phosphate. This condition creates a more favorable environment for methane-producing microbes.
Feedback loop concerns scientists
The risk highlighted by the research lies in the formation of a feedback loop. Warmer oceans can reduce the arrival of phosphate at the surface, stimulate microbial methane production, and increase the release of the gas into the atmosphere.
With more methane in the air, heat retention can increase. This additional warming, in turn, can further intensify the conditions that favor new oceanic emissions.
The research shows how small-scale biological processes can impact the global climate. Even occurring at the microbial level, methane production in the open ocean can influence the evolution of climate change.
Mechanism still missing from climate models
The identified mechanism does not yet appear in most major climate models. This absence may limit the accuracy of projections regarding the speed and intensity of climate change.
Weber states that the work helps fill a fundamental gap in climate predictions. This gap involves the interactions between environmental changes and natural sources of greenhouse gases in the atmosphere.
The study, published on March 17, 2026, references the article “Phosphate scarcity governs methane production in the global open ocean,” authored by Shengyu Wang, Hairong Xu, and Thomas S. Weber. The publication’s DOI is 10.1073/pnas.2521235123.
The main conclusion is that ocean warming can alter nutrient availability, favor microbial methane production, and add a new layer of concern to climate projections. This process reinforces the need to consider natural sources of greenhouse gases in predictions about the future of the climate.
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