【中国新闻网】研究发现高氧环境下全球变暖仍可导致海洋缺氧

Core Insights - The research team led by researcher Chen Jitao from the Nanjing Institute of Geology and Palaeontology has discovered that global warming, under current icehouse climate and high oxygen conditions, may lead to widespread ocean deoxygenation, similar to the Late Paleozoic Ice Age [1][2] Group 1: Research Findings - The Late Paleozoic Ice Age is noted as the longest icehouse climate period since the establishment of terrestrial higher plants and ecosystems, with atmospheric CO2 levels spanning from pre-industrial levels to future high carbon emission scenarios [2] - The exceptionally high oxygen environment during this period may be linked to the gigantism of marine and terrestrial animals and could have triggered the major marine biological radiation event from the mid-Carboniferous to the early Permian [2] - The research team studied carbonate rock sediment sequences from 310 to 290 million years ago in the Guizhou Luodian Basin, integrating carbon isotope data, atmospheric CO2 concentration, volcanic activity, and vegetation evolution to analyze global carbon cycling and ocean redox states [2] Group 2: Implications of Findings - The study found that increased organic carbon burial in the ocean during the research period likely led to a decrease in atmospheric CO2 concentration and an increase in oxygen concentration [2] - Intermittent massive carbon emissions could trigger repeated climate warming and seabed deoxygenation, potentially expanding the area of ocean deoxygenation to 4%-12%, which may lead to stagnation or decline in marine biodiversity [2]