Scientists study the ‘secret’ role of ocean microbes in Earth’s carbon cycle

The oceanic carbon cycle [credit: IAEA]

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We’re told: ‘Current climate models struggle to include microbial activity because of its complexity.’ Also: ‘Marine microbes play a central role in how carbon moves through the ocean.’ Putting those two remarks together suggests a rather large gap in the understanding of how the oceanic carbon cycle is working. That in turn puts a question mark against assertions about a human role in the carbon cycle. [Note the ‘biological pump’ part of the graphic above].
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Beneath the ocean’s surface, an unseen system works without pause, says Brighter Side News (via Yahoo.com).

Tiny microbes drift through the water, breaking down organic matter and recycling carbon.

These microscopic organisms quietly influence Earth’s climate, yet their complexity has long puzzled scientists.

A new study from USC Dornsife College of Letters, Arts and Sciences offers a clearer way to understand this hidden world.

Published in Science Advances, the research groups marine microbes into a small number of functional roles, helping explain how they shape the global carbon cycle.

“These microbes are incredibly diverse, but we found that their behavior can be grouped into a manageable number of strategies,” said Naomi Levine, a professor at USC Dornsife. “That gives us a much clearer way to connect microbial life to the carbon cycle.”

A Hidden Workforce Beneath The Waves
Marine microbes play a central role in how carbon moves through the ocean. Some use sunlight to turn carbon dioxide into organic matter. Others consume that material and release carbon back into the water.

This constant exchange helps determine how much carbon the ocean stores and how much returns to the atmosphere. The balance affects global temperatures and climate patterns.

Despite their importance, these communities are difficult to study. A single drop of seawater can contain thousands of microbial species. Each one behaves differently, responding to changes in nutrients and environmental conditions.

“The big challenge has been figuring out how to simplify that complexity without losing what really matters,” Levine said.
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[Talkshop note: see link for further details of the study]
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Why Microbes Matter For Climate
Understanding these patterns is critical for climate science. Marine microbes drive the ocean’s carbon cycle, influencing how much carbon remains trapped in water versus released into the atmosphere.

Current climate models struggle to include microbial activity because of its complexity. Thousands of species interacting in unpredictable ways make accurate predictions difficult.

By reducing this diversity into a small number of functional groups, the new framework offers a practical solution.

“If we want to understand climate, we have to understand the microbes,” Levine said. “They’re the engines driving carbon cycling in the ocean.”

This approach could improve predictions about how oceans respond to climate change, including how much carbon they can store in the future.

Full article here.
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Image: The oceanic carbon cycle [credit: IAEA]

Source: https://tallbloke.wordpress.com/2026/07/11/scientists-study-the-secret-role-of-ocean-microbes-in-earths-carbon-cycle/