白令海北部陆坡100ka来的古海洋学记录及海冰的扩张历史

王汝建; 李霞; 肖文申; 陈荣华

Volume 30 Issue 5

Sep. 2005

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Article Navigation > Earth Science > 2005 > 30(5): 550-558

WANG Ru-jian, LI Xia, XIAO Wen-shen, CHEN Rong-hua, 2005. Paleoceanographic Records and Sea Ice Extension History of the Northern Bering Sea Slope over the Last 100 ka. Earth Science, 30(5): 550-558.

Citation:

WANG Ru-jian, LI Xia, XIAO Wen-shen, CHEN Rong-hua, 2005. Paleoceanographic Records and Sea Ice Extension History of the Northern Bering Sea Slope over the Last 100 ka. Earth Science, 30(5): 550-558.

WANG Ru-jian, LI Xia, XIAO Wen-shen, CHEN Rong-hua, 2005. Paleoceanographic Records and Sea Ice Extension History of the Northern Bering Sea Slope over the Last 100 ka. Earth Science, 30(5): 550-558.

Citation:

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Paleoceanographic Records and Sea Ice Extension History of the Northern Bering Sea Slope over the Last 100 ka

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Submarine Geoscience, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2005-05-17
Publish Date: 2005-09-25

Abstract

Abstract

Quantitative analytic results of biogenic components in core B2-9 from the northern Bering Sea slope indicate that coarse fraction and opal content, serving as proxies of surface productivity, have increased stepwise since the MIS 5.3, reflecting periodic enhancement in surface productivity. Surface productivity attained its highest level during the Holocene, followed by MIS 3.2 to 2. MIS 5.3 to 3.3 showed the lowest level. High TOC content, together with a high C/N ratio, shows that TOC was deposited from mixed sources and therefore can not be used as a proxy of surface productivity. But high TOC and C/N ratio during MIS 5.1, 3.3 to 3.2 and the Holocene reflect that the terrigenous organic matter input increased during interglacial periods. Increases in fine-and silt-grained terrigenous components from MIS 5.3 to the Middle Holocene imply that sea ice on the Bering Sea slope extended continuously in a cooling climate. Ice-rafted (> 0.154 mm quartz and lithic grains) and charcoal detritus increased during glacial, interstadial and the last deglaciation periods, and decreased during interglacial periods, suggesting that sea ice volume on the slope extended and melted, respectively, during glacial and interglacial periods. The extension of sea ice during glacial periods was linked with the climate over North American continent, revealing the responses of sea ice extension in the Bering Sea to global climate change during Late Quaternary glacial and interglacial cycles.
- surface productivity,
- ice-rafted detritus,
- sea ice extension history,
- Late Quaternary,
- Bering Sea

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References(40)

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