Origin of diatom ooze belt in the Southern Ocean; implications for late Quaterary paleoceanography
Origin of diatom ooze belt in the Southern Ocean; implications for late Quaterary paleoceanography
复制标题
南大洋硅藻泥带的起源；
DOI：
10.2307/1485529
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发表时间：
1987
影响因子：
1.5
通讯作者：
J. Cirilli
中科院分区：
文献类型：
--
作者：
L. Burckle;J. Cirilli
研究了南大洋太平洋段表层沉积物中硅藻的保存模式。北部和南部是保存完好的硅藻带，边界是含有保存不佳的硅藻的沉积物。北部边界与亚南极锋密切相关，似乎是由于温度对新陈代谢过程的影响而导致浮游植物生产力下降的结果。南界是由于冬末春初海冰对水柱中硅藻生产力的抑制作用造成的。我们的证据表明，南部边界代表的是春季海冰位置，而不是夏季位置。如果将这些数据应用于太平洋地区的第四纪晚期，冰川盛期冬季海冰复盖似乎只向北小幅扩大。
Diatom preservation patterns in surface sediments of the Pacific sector of the Southern Ocean were examined. A belt of well-preserved diatoms is bounded on the north and south by sediments containing poorly preserved diatoms. The northern boundary correlates closely with the Subantarctic Front and appears to result from reduced phytoplankton productivity caused by temperature effects on metabolic processes. The southern boundary is caused by the damping effect that late winter/early spring sea-ice has on diatom productivity in the water column. Our evidence suggests that the southern boundary represents the spring sea-ice position rather than summer position. When these data are applied to late Quaternary sections in the Pacific sector it appears that there was only a modest northward expansion of winter sea-ice cover during glacial maxima.