Late Quaternary Movements of the Angola-Benguela Front, SE Atlantic, and Implications for Advection in the Equatorial Ocean
Late Quaternary Movements of the Angola-Benguela Front, SE Atlantic, and Implications for Advection in the Equatorial Ocean
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东南大西洋安哥拉-本格拉锋的晚第四纪运动及其对赤道海洋平流的影响
DOI：
10.1007/978-3-642-80353-6_28
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
R. Schneider
中科院分区：
文献类型：
--
作者：
J. Jansen;E. Ufkes;R. Schneider
来自安哥拉-扎伊尔边缘三个核心的浮游有孔虫数据用于重建过去 18 万年安哥拉-本格拉锋 (ABF) 介于暖安哥拉洋流和冷本格拉洋流之间的古位置。强烈的北移发生在第 4 阶段和第 3.3-3.1 阶段，但不是在第 6 阶段和第 2 阶段。本格拉洋流没有渗透到几内亚湾。最南端的位置距离现在不远，在第 5.5 和第 1 阶段以及第 6.3 阶段都被占领了。位移记录在 23 ky-1 轨道频带中包含显着变化，并且有迹象表明存在很强的 100-ky-1 频率分量。 15 ky-1（23-ky-1 和缺失的 41-ky-1 周期的总频率）处也存在很大差异。这种周期性是记录中的一个真实特征。
Planktic foraminifera data from three cores of the Angola-ZaYre margin are used to reconstruct palaeopositions of the Angola-Benguela Front (ABF) between the warm Angola Current and cold Benguela Current for the last 180,000 years. Strong northward shifts occurred in stages 4 and 3.3–3.1, but not in stages 6 and 2. The Benguela Current did not penetrate into the Gulf of Guinea. The southernmost positions, not far from the present one, were occupied in stages 5.5 and 1, but also in stage 6.3. The record of the shifts contains significant variance in the 23 ky-1 orbital frequency band and there are indications for a strong 100-ky-1 frequency component. There is also much variance at 15 ky-1, the sum frequency of the 23-ky-1 and the absent 41-ky-1 cycles. This cyclicity is a real feature in the records.