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