Boundary scavenging at the East Atlantic margin does not negate use of 231Pa/230Th to trace Atlantic overturning

Boundary scavenging at the East Atlantic margin does not negate use of 231Pa/230Th to trace Atlantic overturning
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东大西洋边缘的边界清除并不否定使用 231Pa/230Th 来追踪大西洋翻转

DOI:
10.1016/j.epsl.2012.04.005
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发表时间:
2012
影响因子:
5.3
通讯作者:
M. Christl
M. Christl
中科院分区:
地球科学1区
文献类型:
--
作者:
Lippold;S. Mulitza;G. Mollenhauer;D. Heslop;S. Weyer;M. Christl

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231 Pa/230 Th方法是重建过去冰期-间冰期旋回海洋环流的一个很有前途的工具。然而,海洋粒子通量可能会限制该比值作为大西洋经向翻转环流(AMOC)强度的直接定量代理的适用性,通过影响在海水中原位产生的231 Pa和230 Th之间的分馏。在这里,我们提出了231 Pa/230 Th下芯剖面,从高粒子通量地区的纳米比亚和塞内加尔涵盖了过去的1035 ka。231 Pa/230 Th剖面对粒子通量的时间变化和水团的变化有着不同的响应。结果表明,东大西洋边缘沉积物231 Pa/230 Th与颗粒通量有关,但主要受AMOC模态控制。我们的数据表明,在过去的1030 ka,高生产力的东部边缘没有能力输入和存储大量的231 Pa从开放的海洋。因此,231 Pa/230 Th代用指标重建过去海洋环流的适用性并不受这个潜在的额外231 Pa汇的影响。
The231Pa/230Th method is a promising tool to reconstruct Ocean circulation over the past Glacial–Interglacial cycle. However, marine particle flux may constrain the applicability of this ratio as a direct quantitative proxy for the strength of Atlantic Meridional Overturning Circulation (AMOC) by influencing the fractionation between the in situ produced231Pa and230Th in ocean water. Here we present231Pa/230Th down-core profiles from high particle flux areas off Namibia and Senegal covering the past ∼35ka. The231Pa/230Th profiles at these sites show very different responses to temporal variations of particle fluxes and to changes in water masses. Our results show that sedimentary231Pa/230Th in the Eastern Atlantic margin is linked to particle flux, but controlled primarily by the mode of the AMOC. Our data suggest that during the past ∼30ka the high productivity Eastern margin was not capable of importing and storing significant amounts of231Pa from the open Ocean. Consequently, the applicability of the231Pa/230Th proxy to reconstruct past ocean circulation is not hampered by this potentially additional231Pa sink.
过去 16 万年来本格拉上升流系统古海洋学的快速变化,浮游有孔虫的丰度表明
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影响因子: 1.3
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