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首页> 外文期刊>Paleoceanography >Deglacial variability of Antarctic Intermediate Water penetration into the North Atlantic from authigenic neodymium isotope ratios
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Deglacial variability of Antarctic Intermediate Water penetration into the North Atlantic from authigenic neodymium isotope ratios

机译：自生钕同位素比率对南极中间水向北大西洋渗透的冰期变异性

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摘要

Understanding intermediate water circulation across the last deglacial is critical in assessing the role of oceanic heat transport associated with Atlantic Meridional Overturning Circulation variability across abrupt climate events. However, the links between intermediate water circulation and abrupt climate events such as the Younger Dryas (YD) and Heinrich Event 1(H1)are still poorly constrained. Here, we reconstruct changes in Antarctic Intermediate Water(AAIW)circulation in the subtropical North Atlantic over the past 25 kyr by measuring authigenic neodymium isotope ratios in sediments from two sites in the Florida Straits. Our authigenic Nd isotope records suggest that there was little to no penetration of AAIW into the subtropical North Atlantic during the YD and H1. Variations in the northward penetration of AAIW into the Florida Straits documented in our authigenic Nd isotope record are synchronous with multiple climatic archives, including the Greenland ice core δ ~(18)O record, the Cariaco Basin atmosphere Δ ~(14)C reconstruction, the Bermuda Rise sedimentary Pa/Th record, and nutrient and stable isotope data from the tropical North Atlantic. The synchroneity of our Nd records with multiple climatic archives suggests a tight connection between AAIW variability and high-latitude North Atlantic climate change.
机译：了解整个上次冰期的中间水循环对于评估海洋热传输与突然发生的气候事件中大西洋经向翻转循环变化的关系至关重要。但是，中间水循环与突然的气候事件（如Younger Dryas（YD）和Heinrich事件1（H1））之间的联系仍然受到限制。在这里，我们通过测量佛罗里达海峡两个站点沉积物中的自生钕同位素比率，重建了过去25年来亚热带北大西洋南极中间水（AAIW）循环的变化。我们的自生Nd同位素记录表明，在YD和H1期间AAIW几乎没有渗透到亚热带北大西洋。我们自生的Nd同位素记录中记录的AAIW向佛罗里达海峡北入的变化与多种气候档案同步，包括格陵兰冰芯δ〜（18）O记录，Cariaco盆地大气Δ〜（14）C重建，百慕大上升沉积的Pa / Th记录，以及热带北大西洋的营养和稳定同位素数据。我们的Nd记录与多个气候档案的同步性表明AAIW变异性与高纬度北大西洋气候变化之间存在紧密联系。

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