Tiny Ocean Travelers Lock Away 65 Million Tonnes of Carbon Each Winter
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📰 The quick summary: Tiny ocean zooplankton trap 65 million tonnes of carbon annually in the Southern Ocean through their seasonal migration to deep waters, providing a significant natural carbon storage mechanism that helps regulate Earth’s climate.
📈 One key stat: The seasonal migrant pump transports roughly 65 million tonnes of carbon to depths below 500 meters annually, with small copepods accounting for 80% of this carbon movement.
💬 One key quote: “Our work shows that zooplankton are unsung heroes of carbon sequestration. Their seasonal migrations create a massive, previously unquantified carbon flux—one that models must now incorporate.”
1️⃣ The big picture: Scientists have discovered a major climate regulation process that happens each winter in the Southern Ocean. Billions of tiny zooplankton such as copepods, krill, and salps migrate hundreds of meters into deep waters to hibernate, carrying carbon with them. This newly quantified ‘seasonal migrant pump’ locks away approximately 65 million tonnes of carbon annually beneath 500 meters, where it can remain stored for centuries. Until now, researchers believed most ocean carbon storage happened through sinking organic waste, but this direct transportation by zooplankton proves to be a powerful and efficient alternative pathway.
2️⃣ Why is this good news: This discovery reveals nature has a more robust carbon sequestration system than previously understood. Unlike sinking detritus which removes both carbon and vital nutrients like iron, migrating zooplankton efficiently inject carbon into the deep ocean while recycling nutrients near the surface. The Southern Ocean already absorbs approximately 40% of human-made CO2 taken up by oceans, and this zooplankton activity enhances that capacity. This natural process has been operating continuously, helping to regulate Earth’s climate through carbon storage that works over centuries or longer, and understanding it better can inform climate management strategies.
3️⃣ What’s next: Scientists must now update climate models to include these zooplankton-driven carbon fluxes that have been overlooked. Protection of Southern Ocean ecosystems becomes even more critical as industrial fishing and warming threaten krill populations central to both carbon export and Antarctic biodiversity. Future research should focus on how climate change might shift species distributions and alter this carbon storage mechanism.
Read the full story here: SciTechDaily – Each Winter, These Tiny Ocean Travelers Bury Millions of Tons of Carbon
