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

CHEN Zhi-hua; SHI Xue-fa; CAI De-ling; HAN Yi-bing; YANG Zuo-sheng

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CHEN Zhi-hua, SHI Xue-fa, CAI De-ling, HAN Yi-bing, YANG Zuo-sheng. Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments[J]. Haiyang Xuebao, 2006, 28(6): 61-71.

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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

Received Date: 2005-02-23
Rev Recd Date: 2006-07-20

Abstract

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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References(56)

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