A pervasive link between Antarctic ice core and subarctic Pacific sediment records over the past 800 kyrs

被引:68
作者
Jaccard, S. L. [1 ]
Galbraith, E. D. [2 ]
Sigman, D. M. [3 ]
Haug, G. H. [1 ,4 ]
机构
[1] ETH, Inst Geol, CH-8092 Zurich, Switzerland
[2] McGill Univ, Montreal, PQ, Canada
[3] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA
[4] Univ Potsdam, Inst Geosci, Leibniz Ctr Earth Surface & Climate Studies, D-14476 Potsdam, Germany
基金
美国国家科学基金会;
关键词
ATMOSPHERIC CO2 CONCENTRATIONS; NORTH PACIFIC; NORTHWESTERN PACIFIC; BIOLOGICAL PUMP; MARINE BARITE; BIOGENIC OPAL; DEEP-SEA; OCEAN; CLIMATE; FLUXES;
D O I
10.1016/j.quascirev.2009.10.007
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Recently developed XRF core-scanning methods permit paleoceanographic reconstructions on time-scales similar to those of ice-core records. We have investigated the distribution of biogenic barium (Ba/Al), opal and carbonate (Ca/Al) in a sediment core retrieved from the abyssal subarctic Pacific (ODP 882, 50 degrees N, 167 degrees E, 3244 m) over an interval that spans the full length of the EPICA Dome C (EDC) ice-core record. Ba/Al and biogenic opal show a strong resemblance to the EDC delta D and CO2, with generally high concentrations during interglacials and lower values during ice ages of the past 800 kyrs. The sedimentary Ba/Al and biogenic opal are most easily interpreted as indicating a reduced sinking flux of organic matter from the surface ocean during cold periods. The Ba/Al maxima during peak interglacials are accompanied by transient Ca/Al peaks in these otherwise carbonate-devoid sediments, which are best explained by a deepening of the calcite lysocline, presumably due to reduced storage of respired CO2 in the deep North Pacific. For most of the "luke-warm" interglacials noted between 420 and 750 ka in EDC, the Ba/Al peaks in ODP 882 are also lower, further strengthening the evidence for a simple physical link between global climate and the biogeochemistry of the subarctic Pacific. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:206 / 212
页数:7
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