Palaeoceanography on the European arctic margin during the last deglaciation

被引:38
作者
Hald, M [1 ]
Dokken, T [1 ]
Hagen, S [1 ]
机构
[1] UNIV TROMSO,DEPT GEOL,N-9037 TROMSO,NORWAY
来源
LATE QUATERNARY PALAEOCEANOGRAPHY OF THE NORTH ATLANTIC MARGINS | 1996年 / 111期
关键词
D O I
10.1144/GSL.SP.1996.111.01.18
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
To reveal the palaeoceanographic and palaeoclimatic evolution related to the disintegration of the Barents Sea and Fennoscandian ice sheets, high-resolution sediment cores from the continental margin off western Svalbard, western Barents Sea and northern Norway were investigated. The location of these cores is below the axis of the Norwegian Current and beyond, but close to, glaciated continental areas. Hence they should sensitively reflect the palaeoceanography of the northernmost Norwegian Sea. Between , 14.5-19.5 and 22.5-29 14C ka, a high abundance of planktonic foraminifera and a small content of subpolar species indicate seasonally ice-free and slightly warmed surface water. This phenomenon is related to the advection of surface water of North Atlantic origin. The onset of the deglaciation is characterized by a marked low oxygen event dated to between 15 and 13 ka, interpreted to reflect a surface water freshening produced by meltwater and reduced oceanic mixing. After the onset of deglaciation, the surface ocean warmed in three rapid steps: (1) around 12.5 ka, indicated by increased abundances of planktonic foraminifera; (2) at 10.2ka and at (3) 10-9.6 ka. The two latter steps are reflected by the increased abundance of subpolar planktonic foraminifera.
引用
收藏
页码:275 / 287
页数:13
相关论文
共 57 条
[1]  
Alm T., Øvre Æårsvatn-palynostratigraphy of a 22,000 to 10,000 B.P. lacustrine record on a Andeya, northern Norway, Boreas, 22, pp. 71-188, (1993)
[2]  
Andrews J.T., Erlenkeuser H., Tedesco K., Aksu A., Jull A.J.T., Late Quaternary (Stage 2 and 3) meltwater and Heinrich events, NW Labrador Sea, Quaternary Research, 41, pp. 26-34, (1994)
[3]  
Adlandsvik B., Loeng H., A study of the climatic system in the Barents Sea, Polar Research, 10, pp. 45-59
[4]  
Bard E., Hamelin B., Fairbanks R.G., Zindler A.H., Calibration of the <sup>14</sup>C timescale over the past 30,000 years using mass spectrometric U-Th ages from Barbados corals, Nature, 346, pp. 453-458, (1990)
[5]  
Charles C.D., Fairbanks R.G., Evidence from Southern Ocean sediments for the effect of North Atlantic deep-water flux on climate, Nature, 355, pp. 416-419, (1992)
[6]  
Crowley T.J., North G.R., Paleoclimatology, (1991)
[7]  
Dansgaard W., Johnsen S.J., Et al., Evi-dence for general instability of past climate from at 250-kyr ice-core record, Nature, 364, pp. 218-220, (1993)
[8]  
White J.W.C., Johnsen S.J., The abrupt termination of the Younger Dryas climate event, Nature, 339, pp. 532-534, (1989)
[9]  
Duplessy J.C., Isotopic studies, Climatic Change, pp. 46-67, (1978)
[10]  
Fairbanks R.G., A 17,000-year glacio-eustatic sea level record: Influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation, Nature, 298, pp. 841-844, (1989)