北冰洋西部沉积物有机碳、氮同位素特征及其环境指示意义

陈志华; 石学法; 蔡德陵; 韩贻兵; 杨作升

北冰洋西部沉积物有机碳、氮同位素特征及其环境指示意义

1.
中国海洋大学海洋地球科学学院, 山东青岛 266003;国家海洋局第一海洋研究所, 山东青岛 266061;海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061
2.
国家海洋局第一海洋研究所, 山东青岛 266061;海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061
3.
国家海洋局第一海洋研究所, 山东青岛 266061
4.
中国海洋大学海洋地球科学学院, 山东青岛 266003

基金项目: 中国第二次北极考察资助项目(CHINARE-2003);国家自然科学基金资助项目(40506004;40431002)

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出版历程
- 收稿日期: 2005-02-23
- 修回日期: 2006-07-20

Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments

1.
College of Marine Geoscience, Ocean University of China, Qingdao 266003, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;State Oceanic Administration Key Laboratory of Marine Sedimentology & Environmental Geology, Qingdao 266061, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;State Oceanic Administration Key Laboratory of Marine Sedimentology & Environmental Geology, Qingdao 266061, China
3.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
4.
College of Marine Geoscience, Ocean University of China, Qingdao 266003, China

摘要

摘要: 通过对楚科奇海及邻近的北冰洋深水区表层沉积物中有机碳同位素含量(δ¹³C)、氮同位素含量(δ¹⁵N)及生物成因SiO₂(BSiO₂)含量分析,结果表明海源和陆源有机质的分布受海区环流结构和营养盐结构所制约.楚科奇海中西部和楚科奇海台受太平洋富营养盐海水的影响,海洋生产力高,沉积物中海源有机质和BSiO₂含量高;靠阿拉斯加一侧海域海水的营养盐含量和生产力都偏低,沉积物中陆源有机质比重增加;在研究区北部和东北部的楚科奇高地和加拿大海盆,冰封时间较长,营养盐供应少,海洋生产力低,但来自马更些河和阿拉斯加北部的陆源有机质增多,沉积物中BSiO₂含量小于5%,海源有机质百分含量小于40%.由于亚北极太平洋水通过楚科奇海向北冰洋海盆输送,研究区营养盐池表现为开放系统,营养盐的利用率与它的供应成反比,与海洋生产力成反比.
- 北冰洋 /
- 表层沉积物 /
- 有机质 /
- 碳同位素 /
- 氮同位素 /
- 生物硅
Abstract: Surface sediments from the Chukchi Sea and adjacent arctic deep sea were invest igated for organic carbon and nitrogen isotopes and biogenicopal.The results indicate that the dist ributions of marine-derived and terrigenous organic materials are mainly controlled by marine circulation and seawater nutrient structure in the region.Owing to the influence of the nutrient-rich branch of the Pacific waters entering from the Bering Strait,the central-west Chukchi Sea and the Chukchi Rise have high productivity insur-face water,and high contents of marine-derived or ganic material and biogenic SiO₂ in surface sediments.The nearshore of fnor thwestern Alaska has less nutrient-rich seawater,so it has decreasing surface water productivity and enhancing signals of terrigenous organic δ¹³C and δ¹⁵N contents in sediments.There are relatively long duration of ice cover and the least nutrient-rich seawater in the Chukchi Plateau and the Canada Basin in the northeast and the north of the study area,so there are the lowest productivity in sur-face water and the highest terrigenous organic component in surface sediments;the relatively large contri-bution of terrigenous organic material comes from the Mackenzie River and the northern Alaska due to the transport of the clockwise Beaufortgyre.Because the subarctic Pacific waters are charged into the central basin of the Arctic Ocean through the Chukchi Sea,the nutrient pool in the study area can be considered as a typical open system,the level of nutrient utilization is contrary to nutrient supply and marine productivity formed in seawater.
- Arctic Ocean /
- surface sediments /
- organic carbon and nitrogen isotopes /
- biogenicopal /

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