| Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments |
| |
| 作者姓名： | CHEN Zhihu SHI Xuef CAI Deling HAN Yibing YANG Zuosheng |
| |
| 作者单位： | [1]Ocean University of China, Qingdao 266003, China [2]First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China [3]Key Laboratory of Marine Sedimentology ＆ Environmental Geology of State Oceanic Administration, First Institute of Oceano-graph, State Oceanic Administration,Qingdao 266061, China |
| |
| 摘 要： | 1 IntroductionFor several reasons, the Arctic Ocean and itsmarginal seas are key areas for understanding ocean-ic circulation and global climate system ( Clark,1982; Hansen et al., 1983; Walsh et al., 1996;Overpeck et al., 1997). First, the Arctic Ocean i…
|
| 关 键 词： | 北冰洋西北部海域 海面沉积物 有机碳氮同位素 沉积环境 生物硅 楚科奇海 |
| 收稿时间： | 2006-01-15 |
| 修稿时间： | 2006-05-03 |
Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments |
| |
| CHEN Zhihu,SHI Xuef,CAI Deling,HAN Yibing,YANG Zuosheng.Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments[J].Acta Oceanologica Sinica,2006,25(5):39-54. |
| |
| Authors: | CHEN Zhihu SHI Xuef CAI Deling HAN Yibing and YANG Zuosheng |
| |
| Institution: | Ocean University of China, Qingdao 266003, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology & Environmental Geology of State Oceanic Administration, First Institute of Oceanograph, State Oceanic Administration, Qingdao 266061, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology & Environmental Geology of State Oceanic Administration, First Institute of Oceanograph, State Oceanic Administration, Qingdao 266061, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology & Environmental Geology of State Oceanic Administration, First Institute of Oceanograph, State Oceanic Administration, Qingdao 266061, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology & Environmental Geology of State Oceanic Administration, First Institute of Oceanograph, State Oceanic Administration, Qingdao 266061, China;Ocean University of China, Qingdao 266003, China |
| |
| Abstract: | Surface sediments from the Chukchi Sea and adjacent arctic deep sea were investigated for organic carbon and nitrogen isotopes (in δ13Corg and δ15Norg) as well as biogenic silica (BSiO2). δ13Corg and δ15Norg values of surface sediments in the study area fall between the end-member values of marine and terrestrial organic matter from the surrounding lands and seas, their variations reflect the changes of marine productivity and terrestrial supply in the study area. BSiO2 shows a similar distribution pattern with δ13Corg and δ15Norg, and can be used as an indicator of marine productivity. In the central-west Chukchi Sea and the Chukchi Rise, sediments have higher δ13Corg, δ15Norg and BSiO2 values, indicating the region has high marine productivity influenced by the nutrient-rich branches of the Pacific waters. In the coastal zone off northwestern Alaska, δ13Corg and δ15Norg values become lighter, indicating a weakening marine productivity and an increasing terrigenous supply due to the effects of the least nutrient-rich branch of the Pacific waters. In the north and the northeast of the study area (including the Chukchi Plateau, the Canada Basin and the Beaufort shelf), δ13Corg, δ15Norg and BSiO2 have the lowest values, and the terrigenous organic matter becomes dominant in surface sediments because this region has the longest ice-covered duration, the least nutrient-rich seawater and the increasing supply of terrestrial materials from the Mackenzie River and the northern Alaska under the action of the clockwise Beaufort gyre. Because the subarctic Pacific waters are continuously discharged into the central basin of the Arctic Ocean through the study area, the nutrient pool in the Chukchi Sea can be considered as a typical open system, the ratio of δ15N to BSiO2 content show some tracers that the level of nutrient utilization is contrary to nutrient supply and marine productivity formed in seawater. |
| |
| Keywords: | western Arctic Ocean surface sediments organic carbon and nitrogen isotopes biogenic silica |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
|
