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3 亿年前的全球暖化

2025-06-21 11:55 by 冰上斯芬克斯

地球正在快速变暖,但你知道吗?早在 3 亿多年前,类似的气候剧变就曾引发海洋生命的巨大波动。南京大学研究团队在《Science Advances》发表研究报告:在晚古生代(约3.4亿至2.5亿年前),地球缓慢变冷时,海洋生物加速演化、种类剧增;而一旦气候急剧变暖,尤其是火山喷发带来的升温,便引发大规模物种灭绝。研究主角是一群叫做䗴类有孔虫(fusuline)的远古单细胞海洋生物,它们个体虽小,但数量惊人(图1),曾主宰海底世界,被誉为“碳酸盐岩工厂”。团队发现,9180 多万年间,这些生物经历了两次“多样化爆发”和四次“灭绝危机”。尤其在 2.6亿 年前峨眉山大规模火山喷发前后,体型较大的䗴类几乎绝迹;而 2.52 亿年前的二叠纪末期超级火山事件,更彻底终结了这个庞大家族的演化历程。值得警惕的是,人类活动引发的现代全球变暖,其速度已远超古代峨眉山玄武岩和二叠纪末火山事件带来的变暖速率。当前的海洋生态系统或正经历类似䗴类曾遭遇的命运考验。

www.eurekalert.org/news-releases/1087934?language=chinese

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3 亿年前的全球暖化

2025-06-21 11:55 by 冰上斯芬克斯

地球正在快速变暖,但你知道吗?早在 3 亿多年前,类似的气候剧变就曾引发海洋生命的巨大波动。南京大学研究团队在《Science Advances》发表研究报告:在晚古生代(约3.4亿至2.5亿年前),地球缓慢变冷时,海洋生物加速演化、种类剧增;而一旦气候急剧变暖,尤其是火山喷发带来的升温,便引发大规模物种灭绝。研究主角是一群叫做䗴类有孔虫(fusuline)的远古单细胞海洋生物,它们个体虽小,但数量惊人(图1),曾主宰海底世界,被誉为“碳酸盐岩工厂”。团队发现,9180 多万年间,这些生物经历了两次“多样化爆发”和四次“灭绝危机”。尤其在 2.6亿 年前峨眉山大规模火山喷发前后,体型较大的䗴类几乎绝迹;而 2.52 亿年前的二叠纪末期超级火山事件,更彻底终结了这个庞大家族的演化历程。值得警惕的是,人类活动引发的现代全球变暖,其速度已远超古代峨眉山玄武岩和二叠纪末火山事件带来的变暖速率。当前的海洋生态系统或正经历类似䗴类曾遭遇的命运考验。

www.eurekalert.org/news-releases/1087934?language=chinese

#科学

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