北冰洋西部晚第四纪浮游有孔虫Neogloboquadrina pachyderma(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,MIS 7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。 A comprehensive study on δ18O and δ13C of shell and abundance of planktonic foraminifera and raft ice debris of Neogloboquadrina pachyderma (sin.) (Nps) shell in the western Arctic Ocean shows that since the late MIS7, Nps The δ18O and δ13C values ​​were significantly undeveloped seven times, which may be related to the production and sinking of light isotopic brine due to the increase of sea ice formation rate. Slightly lower Npsδ18O and δ13C values ​​correspond to very low abundance of planktonic foraminifera and raft ice debris, so these light values ​​are independent of warm Atlantic and freshwater inputs and should indicate that Atlantic Atlantic water entering the Arctic Ocean weakens A substantial reduction of water in the Cochrane shelf. In contrast, the heavier Npsδ18O values ​​reflect a decrease in freshwater and Pacific water inputs to the Arctic Ocean; the heavier Npsδ13C values ​​are indicative of a more favorable circulation from the shelf to the Arctic Ocean.