【摘要】 对"中国第五次北极科考"和"中国第六次北极科考"采集的楚科奇海陆架、海台及海盆区的5个多管样品进行210 Pb、粒度、有机碳(OC)和总氮(TN)含量及有机碳同位素(δ13 C)、总氮同位素组成(δ15 N)分析,初步获得5个多管样品近百年来的沉积速率,陆架区沉积速率为0.19~0.41cm/a,海台和海盆区沉积速率为0.03~0.04cm/a;近百年来陆架有机碳、总氮含量分别为1.21%~1.62%、0.17%~0.21%,有机碳、总氮同位素组成分别为-22.30‰~-22.25‰PDB、7.24‰~8.12‰;海台与海盆区有机碳、总氮含量分别为0.80%~1.26%、0.13%~0.16%,有机碳、总氮同位素组成分别为-22.52‰~-22.07‰PDB、7.38‰~7.81‰。陆架与海台和海盆相比,具有沉积速率高、沉积物颗粒粗、有机碳和总氮含量高的特点。近百年来楚科奇海域陆架、海台和海盆区有机碳以海洋生源输入为主,反映了北极气候变暖,水体初级生产力增加。更多还原

【Abstract】 Five multicores were taken from the Chuckchi Sea Shelf,Chuckchi Sea Plateau and Chuckchi Sea Basin during the fifth Chinese National Arctic Research Expedition in 2012 and the sixth Chinese National Arctic Research Expedition in2014.All samples were analyzed for 210 Pb,grain size,organic carbon(OC)concentration and total nitrogen(TN)content as well as stable the isotopes of organic carbon(δ13 C)and nitrogen(δ15 N).The sedimentation rates of the 5 multicores are 0.19~0.41 cm/a in the shelf area,and 0.03~0.04 cm/a on the Plateau and in the Basin area.The OC and TN contents are1.21%~1.62% and 0.17%~0.21% respectively,while theδ13 C andδ15 N are-22.30‰~-22.25‰PDB and 7.24‰~8.12‰in the Shelf area during the past 100 years.The OC and TN content are 0.80%~1.26% and0.13%~0.16%respectively,while theδ13 C andδ15 N are-22.52‰~-22.07‰PDB and 7.38‰~7.81‰ on the Plateau and in the Basin area during the same period.The OC and TN content as well as the sedimentation rate are higher in the Shelf area than those in the Plateau and Basin.The sediments are coarser in the shelf area than those in the Plateau and Basin area.The OC is mainly from the marine input,suggesting that the Arctic Ocean was warmer and productivity higher in the past 100 years.更多还原