How mountains could supercharge carbon uptake in the ocean

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illuminem summarises for you the essential news of the day. Read the full piece on earth.com or enjoy below:

🗞️ Driving the news: A new study reveals how exposed mountains in Antarctica, as glaciers thin, are playing a vital role in the carbon cycle by releasing iron-rich sediments that fuel phytoplankton growth
• These tiny organisms, which absorb carbon dioxide through photosynthesis, could become an important carbon sink as the ice continues to melt

🔭 The context: Antarctica’s mountains, long buried beneath ice, are being exposed as glaciers retreat due to rising temperatures
• As these rocks weather, they release iron, a crucial nutrient for phytoplankton in the ocean
• This process, though slow, contributes to a natural system that helps absorb carbon dioxide, which is essential for combating climate change
• However, the system operates over thousands of years and cannot quickly counter the effects of human-driven climate change

🌍 Why it matters for the planet: This discovery highlights a natural mechanism for carbon sequestration, as phytoplankton thrive on the iron released by exposed rocks
• The process is particularly significant in the Southern Ocean, where nutrient scarcity limits phytoplankton growth
• While this is not a short-term solution for climate change, it demonstrates how long-term natural processes can influence global carbon cycles and may play a role in mitigating future climate impacts

⏭️ What's next: As Antarctica’s ice sheets continue to thin, more mountains will become exposed, potentially releasing more iron-rich sediment
• Researchers are studying how this slow process could impact ocean ecosystems and carbon absorption over centuries, helping predict future shifts in ocean biology and climate patterns as the Earth warms

💬 One quote: “Antarctica’s mountains may look barren, yet they hold chemical processes that echo far beyond the ice.” – Dr. Kate Winter, Northumbria University

📈 One stat: Iron-rich sediments may take between 10,000 to 100,000 years to reach the coast, significantly contributing to ocean nutrient cycles over millennia

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