气候越暖，南极冰间湖越“吸碳”？

Core Insights - Antarctic ice lakes have significant carbon sequestration capabilities, contributing approximately 42% of the total organic carbon burial in the Southern Ocean despite occupying only about 3% of its area [2][3] - The carbon absorption capacity of these ice lakes has increased ninefold over the past 12,000 years due to climate warming [2] Group 1: Research Findings - A research team from Peking University and various institutions analyzed 86 sediment core samples from multiple Antarctic regions, creating a high-resolution carbon burial record from 12,000 years ago to the present [2] - The study published in the Proceedings of the National Academy of Sciences reveals that warming climate leads to reduced sea ice cover, which in turn expands the area and duration of open water in ice lakes, enhancing phytoplankton growth and carbon absorption [2] Group 2: Implications of Climate Change - The research indicates that under current warming rates, which are approximately twice the global average in Antarctica, the carbon burial rate in ice lakes could reach nearly three times the current level by the end of the century [3] - The findings suggest that the Antarctic ice lake system may act as a natural "buffer" for the Earth's climate system, potentially offsetting some of the increases in atmospheric CO2 due to human activities [3] Group 3: Future Considerations - It is essential to incorporate changes in ice lake area, biogeochemical processes, and their feedback on warming into next-generation Earth system models to accurately predict ocean carbon absorption capacity and climate change trajectories [3] - Understanding the regulatory capacity of natural systems like Antarctic ice lakes is crucial for a comprehensive understanding of Earth's system complexity and for promoting sustainable development [3]