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首页> 外文期刊>Paleoceanography >Millennial-scale climate variability in the subpolar North Atlantic Ocean during the late Pliocene
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Millennial-scale climate variability in the subpolar North Atlantic Ocean during the late Pliocene

机译：上新世晚期北极次极海洋的千禧尺度气候变化

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Large-amplitude millennial-scale climate oscillations have been identified in late Pleistocene climate archives from around the world. These oscillations appear to be of larger amplitude during times of enlarged ice sheets. This observation suggests the existence of a relationship between large-amplitude millennial variations in climate and extreme glacial conditions and therefore that the emergence of millennial-scale climate variability may be linked to the Pliocene intensification of northern hemisphere glaciation (iNHG). Here we test this hypothesis using new late Pliocene high-resolution (～400 year) records of ice-rafted debris deposition and stable isotopes in planktic foraminiferal calcite (Globigerinoides ruber) generated from Integrated Ocean Drilling Program Site U1313 in the subpolar North Atlantic (a reoccupation of the classic Deep Sea Drilling Project Site 607). Our records span marine oxygen isotope stages (MIS) 103-95 (～2600 to 2400 ka), the first interval during iNHG (～3.5 to 2.5 Ma) in which large-amplitude glacial-interglacial cycles and inferred sea level changes occur. Our records reveal small-amplitude variability at periodicities of ～1.8 to 6.2 kyr that prevails regardless of (inter)glacial state with no significant amplification during the glacials MIS 100, 98, and 96. These findings imply that the threshold for the amplification of such variability to the proportions seen in the marine archive of the last glacial was not crossed during the late Pliocene and, in view of all available data, likely not until the Mid-Pleistocene Transition.
机译：在世界各地晚更新世的气候档案中已经发现了大幅度的千年尺度气候振荡。在冰盖增大时，这些振荡似乎具有较大的振幅。该观察结果表明，气候的大幅度千年变化与极端冰河条件之间存在着关系，因此，千年尺度气候变化的出现可能与北半球冰川的上新世强化有关。在这里，我们使用北大西洋次极洲（a）的综合海洋钻探计划站点U1313产生的板状有孔虫方解石（Globigerinoides ruber）中的浮冰碎片沉积和稳定同位素的最新上新世晚期（〜400年）记录来检验该假设。重新占领了经典的深海钻探项目站点607）。我们的记录跨越了海洋氧同位素阶段（MIS）103-95（〜2600至2400 ka），这是iNHG（〜3.5至2.5 Ma）期间的第一个间隔，在该间隔中发生了大幅度的冰晶间冰期循环和推断的海平面变化。我们的记录显示，在〜1.8至6.2 kyr的周期内存在小幅度变化，无论（中间）冰川状态如何，在MIS 100、98和96期间均无明显放大。这些发现暗示，此类MIS的放大阈值在上新世晚期，没有对上一个冰川的海洋档案中所见比例的变化进行统计，并且根据所有可用数据，可能直到中新世过渡期才出现。

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