350ka以来北冰洋波弗特环流演变及其沉积响应

海洋学研究 ›› 2012, Vol. 30 ›› Issue (4): 20-28.

350ka以来北冰洋波弗特环流演变及其沉积响应

叶黎明, 葛倩, 杨克红, 许冬

国家海洋局海底科学重点实验室,国家海洋局第二海洋研究所,浙江杭州 310012

收稿日期:2012-09-24 修回日期:2012-10-12 出版日期:2012-12-15 发布日期:2022-11-30
作者简介:叶黎明(1978-),男,浙江遂昌县人,博士,主要从事古海洋学研究。E-mail: xinshanren@163.com
基金资助:
国家自然科学基金资助项目(41106048); 国家海洋局第二海洋研究所基本科研业务费专项经费资助项目(JG1001); 南北极环境综合考察与评估专项资助项目(CHINARE 2012-0302)

Variations of the Beaufort Gyre and depositional responses in the Arctic Ocean since the 350 ka

YE Li-ming, GE Qian, YANG Kehong, XU Dong

Laboratory of Submarine Geosciences, SOA, Second Institute of Ocea nography,SOA,Hangzhou 310012, China

Received:2012-09-24 Revised:2012-10-12 Online:2012-12-15 Published:2022-11-30

摘要/Abstract

摘要： 波弗特环流(Beaufort Gyre)是决定北冰洋海冰运移方向和滞留时间的主要因素。依据沉积物的颜色旋回、Mn元素含量和有孔虫丰度,本文建立了阿尔法洋脊(Alpha Ridge)B85-D孔轨道尺度上的年龄框架,并深入分析了该孔晚第四纪以来冰筏碎屑(IRD>154 μm)含量、组分及其源区的变化特点。结果表明,350ka以来最显著的变化发生在末次冰期(MIS2~4期),期间沉积物中Ca元素和白云石含量都接近于零,大部分来自班克斯岛、维多利亚岛和麦肯齐地区的碳酸盐岩碎屑没有在阿尔法洋脊沉积;随着波弗特环流的消亡,搬运陆源碎屑的海冰很可能沿着北美海岸线直接进入了欧亚海盆。而在末次间冰期(MIS5期),波弗特环流却十分流畅,并将大量碳酸盐岩碎屑限制在美亚海盆内,导致阿尔法洋脊沉积物中Ca元素含量急剧升高,与之对应的白云石含量高达16.4%。通过类比可知,在MIS6期波弗特环流的状态可能与MIS2~4期相似,而在MIS8和MIS10这两大冰期,波弗特环流却类似于MIS5期。显然,波弗特环流的存在与否并不严格遵循“冰期-间冰期”旋回,这种变化很可能是风场强度和海冰浓度双重作用的结果。

关键词: 北冰洋, 波弗特环流, 冰筏碎屑, 碳酸盐岩, 白云石

Abstract: The Beaufort Gyre was usually suggested as a main factor to control the residence time and moving direction of sea ice in the Arctic Ocean. Based on records of sediment color cycle, Mn content and foraminiferal abundance, we built up the orbital timescale for the core B85-D from the Alpha Ridge, and discussed variations of ice-rafted debris (IRD> 154 μm) in content, composition and provenance since the Late Quaternary. The results suggest that the most distinct variations occurred during the last glacial (MIS2 ~4) as remarked by the near zero contents of calcium and dolomite, indicating that the carbonate debris from Banks Is., Victoria Is. and District of Mackenzie did not deposit at the Alpha Ridge. The carbonate debris, transported by sea ice, was most likely heading to the Eurasian Basin along the off shore of the North America during the last glacial, when the Beaufort Gyre vanished. In contrast, the carbonate debris was mostly trapped in the Amerasian Basin during the last interglacial (MIS5), when the Beaufort Gyre became strong so as to deposit relatively high content of calcium and dolomite, which was up to 16. 4%. By comparison, is it indicated that the state of the Beaufort Gyre during the MIS6 was closely analogous to that during the MIS2~4,but its state during the glaials MIS8 and MIS10 similar to its state during the interglacial MIS5. Therefore,variations in the Beaufort Gyre are not strictly characterized by the glacial-interglacial cycles, which we speculate, to be modulated by the sea ice concentrationas well as the wind pressure.

Key words: the Arctic Ocean, Beaufort Gyre, ice-rafted debris, carbonate, dolomite

中图分类号:

P736

叶黎明, 葛倩, 杨克红, 许冬. 350ka以来北冰洋波弗特环流演变及其沉积响应[J]. 海洋学研究, 2012, 30(4): 20-28.

YE Li-ming, GE Qian, YANG Kehong, XU Dong. Variations of the Beaufort Gyre and depositional responses in the Arctic Ocean since the 350 ka[J]. Journal of Marine Sciences, 2012, 30(4): 20-28.

参考文献

[1] IMBRIE J, BOYLE E A, CLEMENSSC, et al. On the structure and origin of major glaciations cycles: 1. Linear responses to Mi-lankovitch forcing[J]. Paleoceanography, 1992,7(6):701-738.
[2] IMBRIE J,BERGER A,BOYLE E A, et al. On the structure and origin of major glaciations cycles: 2. The 100, 000-year cycle[J]. Paleoceanography, 1993,8(6):699-735.
[3] POLYAK L,CURRY W B, DARBY D A, et al. Contrasting gla-cial/interglacial regimes in the western Arctic Ocean as exempli-fied by a sedimentary record from the Mendeleev Ridge[J]. Palae-ogeography Palaeoclimatology Palaeoecology, 2004, 203:73-93.
[4] NO RGAARD PEDERSEN N, MIKKELSEN N, KRISTOFFER-SEN Y. Arctic Ocean record of last two glacial interglacial cycles off North Greenland/Ellesmere Island-Implications for glacial his-tory[J]. Marine Geology, 2007,244:93-108.
[5] WANG Ru-jian, XIAO Wen-sheng, LI Wen-bao, et al. Late Quaternary ice-rafted detritus events in the Chukchi Basin, west-ern Arctic Ocean[J]. Chinese Science Bulletin, 2009, 54(23): 3 761-3 770.
王汝建,肖文申,李文宝,等.北冰洋西部楚科奇海盆晚第四纪的冰筏碎屑事件[J].科学通报,2009,54(23):3761-3 770.
[6] BISCHOF J, CLARK D, VINCENT J-S.Origin of ice rafted deb-ris: Pleistocene paleoceanography in the western Arctic Ocean[J]. Paleoceanography, 1996,11(6):743-756.
[7] PHILLIPS R L, GRANTZ A.Regional variations in provenance and abundance of ice-rafted clasts in Arctic Ocean sediments: Im-plications for the configuration of late Quaternary oceanic and at-mospheric circulation in the Arctic[J]. Marine Geology, 2001, 172:91-115.
[8] SPIELHAGEN R F, BAUMANN K-H, ERLENKEUSER H, et al. Arctic Ocean deep-sea record of northern Eurasian ice sheet history[J]. Quaternary Science Reviews, 2004,23:1 455-1 483.
[9] POLYAK L,JAKOBSSON M.Quaternary sedimentation in the Arctic Ocean: Recent advances and further challenges[J]. Ocea-nography, 2011,24(3):52-64.
[10] JOHN K S. Cenozoic ice rafting history of the central Arctic Ocean: Terrigenous sands on the Lomonosov Ridge[J]. Paleoceanography, 2008,23: PA1S05,doi: 10. 1029/2007PA001483.
[11] MCPHEE M G, PROSHUTINSKY A,MORISON J H,et al. Rapid change in freshwater content of the Arctic Ocean[J]. Geo-physical Research Letters, 2009,36: L10602,doi: 10.1029/2009GL037525.
[12] BISCHOF J F, DARBY D A.Mid-to Late Pleistocene ice drift in the western Arctic Ocean: Evidence for a different circulation in the past[J]. Science, 1997,277:74-78.
[13] LOWEMARK L, CHEN H F, YANG T N, et al. Normalizing XRF-scanner data: A cautionary note on the interpretation of high-resolution records from organic rich lakes[J]. Journal of A-sian Earth Sciences, 2011,40:1 250-1 256.
[14] STRAND K, IMMONEN N.Dynamics of the Barents Kara ice sheet as revealed by quartz sand grain microtextures of the late Pleistocene Arctic Ocean sediments[J]. Quaternary Science Re-views, 2010,29:3583-3589.
[15] POLAR RESEARCH GROUP. Polar sea ice cap and snow-cryo-sphere today[DB/OL]. University of Illinois, 2008,http://arc-tic.atmos.uiuc.edu/cryosphere.
[16] KOHFELD K E,FAIRBANKS R G.Neogloboquadrina pachy-derma (sinistral coiling) as paleoceanographic tracers in polar o-ceans: Evidence from Northeast Water Polynya plankton tows, sediment traps, and surface sediments[J]. Paleoceanography, 1996,11(6):679-699.
[17] POLYAK L, EDWARDS M H, COAKLEY B J.Ice shelves in the Pleistocene Arctic Ocean inferred from glaciogenic deep-sea bedforms[J]. Nature, 2001,410:453-457.
[18] JAKOBSSON J M.Optically stimulated luminescence dating supports central Arctic Ocean cm-scale sedimentation rates[J]. Geochemistry Geophysics Geosystems,2003,4(2):1 016,doi:10.1029/2002GC000423.
[19] POOR R Z, PHILIPS R L, RIECK H J.Paleoclimate record for Northwind Ridge, western Arctic Ocean[J]. Paleoceanography, 1993,8(2):149-159.
[20] BACKMAN J, JAKOBSSON M, LOVLIE R, et al. Is the cen-tral Arctic Ocean a sediment starved basin[J]. Quaternary Sci-ence Reviews, 2004,23:1 435-1 454.
[21] JAKOBSSON M, LBVLIE R,ALHANBALI H, et al. Man-ganese and color cycles in Arctic Ocean sediments constrain Pleistocene chronology[J]. Geology, 2000, 28:23-26.
[22] MANGINI A, JUNG M, LAUKENMENN S.What do we learn from peaks of uranium and of manganese in deep sea sediments[J]. Marine Geology, 2001,177:63-78.
[23] FERRO I.Cycling of iron and manganese in freshwater, estuar-ine and deep sea sediments[D]. 2003, Cycling of iron and manganese in freshwater, estuar-ine and deep sea sediments[D].2003, http://irs.ub.rug.nl/ppn/249981661.
[24] YUNKER M B, MACDONALD R W, SNOWDON L R,et al. Alkane and PAH biomarkers as tracers of terrigenous organic carbon in Arctic Ocean sediments[J]. Organic Geochemistry, 2011,42:1 109-1 146.
[25] MARZ C, STRATMANN A,MATTHIESSEN J, et al. Man-ganese-rich brown layers in Arctic Ocean sediments: Composi-tion,formation mechanisms, and diagenetic overprint[J]. Geochimica et Cosmochimica Acta, 2011,75:7 668-7 687.
[26] POLYAK L, BISCHOF J, ORTIZ J D, et al. Late Quaternary stratigraphy and sedimentation patterns in the western Arctic o-cean[J]. Global and Planetary Change, 2009,68:5-17.
[27] KRYLOV A A, ANDREEVA I A,VOGT C,et al. A shift in heavy and clay mineral provenance indicates a middle Miocene onset of a perennial sea ice cover in the Arctic Ocean[J]. Paleo-ceanography, 2008,23: PA1S06, doi: 10. 1029/2007PA001497.
[28] BAZHENOVA E. STEIN R,VOGT C. Provenance discrimina-tion in late Quaternary sediments from the Amerasian Basin (Arctic Ocean) constrained by mineralogical record[J]. Geo-physical Research Abstracts, 2011,13: EGU2011-1095.
[29] RUNDNICK R L,GAO S.Composition of the continental crust[C]//RUNDNICK R L. Treatise on geochemistry. Elsevier, 2003: 1-64.
[30] LIU J G, CHEN M H, XIANG R, et al. Abrupt change of sedi-ment records in the outhern South China Sea during the last gla-cial period and its environment significance[J]. Quaternary In-ternational, 2010: doi: 10.1016/j.quaint.2010.04.018.