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Pacific-Atlantic Circumpolar Deep Water coupling during the last 500ka

机译：最后500ka期间的太平洋大西洋环极深水耦合

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摘要

Investigating the interbasin deepwater exchange between the Pacific and Atlantic Oceans over glacial-interglacial climate cycles is important for understanding circum-Antarctic Southern Ocean circulation changes and their impact on the global Meridional Overturning Circulation. We use benthic foraminiferal C-13 records from the southern East Pacific Rise to characterize the C-13 composition of Circumpolar Deep Water in the South Pacific, prior to its transit through the Drake Passage into the South Atlantic. A comparison with published South Atlantic deepwater records from the northern Cape Basin suggests a continuous water mass exchange throughout the past 500ka. Almost identical glacial-interglacial C-13 variations imply a common deepwater evolution in both basins suggesting persistent Circumpolar Deep Water exchange and homogenization. By contrast, deeper abyssal waters occupying the more southern Cape Basin and the southernmost South Atlantic have lower C-13 values during most, but not all, stadial periods. We conclude that these values represent the influence of a more southern water mass, perhaps Antarctic Bottom Water (AABW). During many interglacials and some glacial periods, the gradient between Circumpolar Deep Water and the deeper southern Cape Basin bottom water disappears suggesting either no presence of AABW or indistinguishable C-13 values of both water masses.
机译：研究冰川和冰川间气候周期之间太平洋和大西洋之间的跨盆地深水交换对于了解南极洲周围的环流变化及其对全球子午翻转环流的影响非常重要。我们使用东太平洋上升南部的底栖有孔虫C-13记录来表征南太平洋绕极深水的C-13组成，然后再通过德雷克海峡进入南大西洋。与北开普盆地北部已发布的南大西洋深水记录进行的比较表明，过去500ka期间水质交换持续不断。几乎相同的冰间冰期C-13变化暗示着两个盆地中共同的深水演化，表明持续的极地深水交换和均质化。相比之下，在大多数（并非全部）恒河期，占据开普盆地南部和最南端的南大西洋的深渊水域的C-13值较低。我们得出的结论是，这些值代表了更南部的水团（也许是南极底水（AABW））的影响。在许多间冰期和某些冰期期间，极地深水与开普盆地南部更深的底部水之间的梯度消失了，这表明没有AABW的存在或两种水团的C-13值都无法区分。

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