A 1.0 Myr record of glacial North Atlantic intermediate water variability from ODP site 982 in the northeast Atlantic

被引:139
作者
Venz, KA
Hodell, DA
Stanton, C
Warnke, DA
机构
[1] Univ Florida, Dept Geol, Gainesville, FL 32611 USA
[2] Calif State Univ Hayward, Dept Geol Sci, Hayward, CA 94542 USA
来源
PALEOCEANOGRAPHY | 1999年 / 14卷 / 01期
关键词
D O I
10.1029/1998PA900013
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Changes in the intermediate water structure of the North Atlantic were reconstructed using benthic foraminiferal delta(13)C at Ocean Drilling Program (ODP) site 982 for the past 1.0 Myr. During most terminations of the late Pleistocene, melting of icebergs and low-salinity surface waters caused production of Glacial North Atlantic Intermediate Water to cease, resulting in decreased ventilation of the middepth North Atlantic. Poor ventilation of intermediate water masses lasted well into some interglacial stages until upper North Atlantic Deep Water (NADW) production resumed under full interglacial conditions. The magnitude of benthic delta(13)C minima and ice-rafted debris maxima at terminations at site 982 generally match the degree of glacial suppression of NADW inferred from site 607. These processes may be related and controlled by the spatial and seasonal extent of sea ice cover during glaciations in the Nordic Seas.
引用
收藏
页码:42 / 52
页数:11
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