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北冰洋西部晚第四纪浮游有孔虫氧碳同位素记录的海冰形成速率

, PP. 643-651

Keywords: Neogloboquadrina,pachyderma,(sin.),δ18O和δ13C轻值,海冰形成速率,晚第四纪,北冰洋西部

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Abstract:

北冰洋西部晚第四纪浮游有孔虫Neogloboquadrinapachyderma(sin.)(Nps)壳体的δ18O和δ13C与浮游有孔虫丰度和筏冰碎屑含量的综合研究表明,MIS7晚期以来,Nps的δ18O和δ13C值出现7次明显的偏轻,可能与海冰形成速率的提高造成轻同位素卤水的生产和下沉相关。偏轻的Npsδ18O和δ13C值对应于极低的浮游有孔虫丰度和筏冰碎屑含量,因此这些轻值与温暖的大西洋水和淡水的输入无关,应当指示进入北冰洋的大西洋水减弱和楚科奇海陆架水的大量减少。相反,Npsδ18O的重值则反映输入北冰洋的淡水和太平洋水的减少;Npsδ13C的重值指示来自陆架流通性更好的表层和盐跃层水向北冰洋的输送。?

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