章伟艳, 于晓果, 汪卫国, 刘焱光, 叶黎明, 边叶萍, 许冬, 杨海丽, 姚旭莹. 近百年来楚科奇海域沉积环境变化的有机碳、氮记录[J]. 海洋地质与第四纪地质, 2018, 38(2): 13-24. DOI: 10.16562/j.cnki.0256-1492.2018.02.002
引用本文: 章伟艳, 于晓果, 汪卫国, 刘焱光, 叶黎明, 边叶萍, 许冬, 杨海丽, 姚旭莹. 近百年来楚科奇海域沉积环境变化的有机碳、氮记录[J]. 海洋地质与第四纪地质, 2018, 38(2): 13-24. DOI: 10.16562/j.cnki.0256-1492.2018.02.002
shu
ZHANG Weiyan, YU Xiaoguo, WANG Weiguo, LIU Yanguang, YE Liming, BIAN Yeping, XU Dong, YANG Haili, YAO Xuying. Records of organic carbon and total nitrogen for environmental changes in the Chukchi Sea during the past 100 years[J]. Marine Geology & Quaternary Geology, 2018, 38(2): 13-24. DOI: 10.16562/j.cnki.0256-1492.2018.02.002
Citation: ZHANG Weiyan, YU Xiaoguo, WANG Weiguo, LIU Yanguang, YE Liming, BIAN Yeping, XU Dong, YANG Haili, YAO Xuying. Records of organic carbon and total nitrogen for environmental changes in the Chukchi Sea during the past 100 years[J]. Marine Geology & Quaternary Geology, 2018, 38(2): 13-24. DOI: 10.16562/j.cnki.0256-1492.2018.02.002
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近百年来楚科奇海域沉积环境变化的有机碳、氮记录

Records of organic carbon and total nitrogen for environmental changes in the Chukchi Sea during the past 100 years

    摘要
  • 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210Pb、粒度、有机碳(OC)和总氮(TN)含量及有机碳同位素(δ13C)、总氮同位素组成(δ15N)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。

     

    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 in 2014. All samples were analyzed for 210Pb, grain size, organic carbon (OC) concentration and total nitrogen (TN) content as well as stable the isotopes of organic carbon (δ13C) and nitrogen (δ15N). The sedimentation rates of the 5 multicores are 0.19~0.41cm/a in the shelf area, and 0.03~0.04cm/a on the Plateau and in the Basin area. The OC and TN contents are 1.21%~1.62% and 0.17%~0.21% respectively, while the δ13C and δ15N 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% and 0.13%~0.16% respectively, while the δ13C and δ15N 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.

     

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