Variations in terrigenous input into the eastern Equatorial Atlantic over 120ka: Implications on Atlantic ITCZ migration

Variations in terrigenous input into the eastern Equatorial Atlantic over 120ka: Implications on Atlantic ITCZ migration
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赤道东部大西洋陆源输入超过 120ka 的变化:对大西洋 ITCZ 迁移的影响

DOI:
10.1016/j.jafrearsci.2018.06.010
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发表时间:
2018-11
影响因子:
2.3
通讯作者:
Yong Tang
Yong Tang
中科院分区:
地球科学4区
文献类型:
--
作者:
Akintoye E. Akinnigbagbe;Xiqiu Han;Weijia Fan;Yong Tang

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东赤道大西洋热带辐合带(ITCZ)位置的变化极大地影响了赤道非洲的降雨,从而影响了非洲边缘的沉积。沉积物的核心。dy26iii - ni - s60 - gc2取自尼日利亚EEA海上斜坡(4°28′56”)。388得名3°33 10”.764'N;根据氧同位素地层和放射性碳测年,该岩心沉积速率范围为0.64 ~ 6.90 cm/ka,平均沉积速率为3.17 cm/ka。我们所研究的核心的MIS 2, MIS 4和MIS 5b时期是。其特征是Fe/K最小,K/Al、Ti/Al和磁化率最大,高岭石较多。这反映了一段时期,该地区被认为是降水较少、贸易强劲的地区。表明中转区位置向南的风。相反,在MIS 1、MIS 3和MIS 5a这三个周期中,相反的趋势;Fe/K、K/Al和Ti/Al记录的波动反映了低纬度日晒周期(23 kyr)和低纬度日晒周期的变化。这表明陆源输入与气候变化之间存在密切的耦合关系。因此,这项工作突出了。陆地输入作为解释ITCZ在EEA位置的先决条件的重要性。
Variation in the location of the Intertropical Convergence Zone (ITCZ) in eastern equatorial Atlantic (EEA).drastically affects rainfall in equatorial Africa and hence sedimentation on the African margin. Sediment core.DY26III-Nig-S60-GC2 taken from the slope of the EEA offshore Nigeria (4°28′56′′.388′E, 3°33′10′′.764′N; water.depth: 2946 m) was studied to decode the climatological response to the ITCZ migration in the past 120 ka..Based on oxygen isotope stratigraphy and radiocarbon dating, the sedimentation rates of this core range from.0.64 to 6.90 cm/ka and average of 3.17 cm/ka. The periods MIS 2, MIS 4 and MIS 5b from our studied core are.characterized by Minima of Fe/K and maxima of K/Al, Ti/Al and magnetic susceptibility along with more.kaolinite. This reflects a period when the region supposedly dominated by less precipitation and strong trade.winds which suggest southward position of the ITCZ. Conversely, the periods MIS 1, MIS 3 and MIS 5a exhibit an.opposite trend; these wet periods are of weak trade winds and northerly ITCZ excursion..Fluctuations in Fe/K, K/Al and Ti/Al records reflect changes in the low-latitude insolation cycle (23 kyr) and.thus indicate a close coupling between terrigenous input and climate changes. This work thus highlights the.importance of the terrigenous input as a prerequisite for the interpretation of ITCZ position in the EEA.
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