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Paleoceanographic records and sea ice extension history on the slope of the northern Bering Sea over the last 100 ka B.P.

引用

Acta Oceanologica Sinica 2005年第6期24卷 117-126页

作者： WANG Rujian LI Xia XIAO Wenshen XIA Peifen CHEN Ronghua State Key Laboratory of Marine Geology Tongji University Shanghai 200092China State Key Laboratory of Marine Geology Tongji University Shanghai 200092China State Key Laboratory of Marine Geology Tongji University Shanghai 200092China State Key Laboratory of Marine Geology Tongji University Shanghai 200092China Key Laboratory of Submarine Geoscience State Oceanic Administration Hangzhou 310012China

Quantitative analytic results of the biogenic components in Core B2-9 fromthe northern Bering Sea slope indicate that the coarse fraction and opal content, serving as proxiesof surface productivity, have increased stepwise since the marine isotope stageCMISJS.S, reflectingperiodic enhancement in surface *** surface productivity attained its highest levelduring the Holocene, followed by MIS 3.2 to 2 and then MIS 5.3 to 3.3 with a lowest level. Hightotal organic carbon(TOC) contents, together with high C/N ratios, which stand mostly between 7 and20, show that the TOC was deposited from mixing sources. Therefore,one has to be cautious to use TOCas a proxy of surface *** high TOC and C/N ratio during MIS 5.1, 3.3 to 3.2 and theHolocene reflect that the terrigenous organic matter input increased during *** in the fine- and silt-grained terrigenous components from MIS 5.3 to the middleHolocene imply that with the cooling climate, sea ice on the Bering Sea slope extended ***-rafted and charcoal detritus increased during glacial, interstadial and the last deglaciationperiods and decreased during interglacial periods, suggesting that sea ice on the slope increasedand melted, respectively, during glacial and interglacial periods. The extension of sea ice duringglacial *** was linked with the climate over the North American Continent, responded toglobal climate change during late Quaternary glacial and interglacial cycles.

关键词： surface productivity ice-rafted detritus sea ice extension history latequaternary bering sea

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