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首页> 外文期刊>Paleoceanography >Comparison of glacial and interglacial conditions between the polar and subpolar North Atlantic region over the last five climatic cycles
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Comparison of glacial and interglacial conditions between the polar and subpolar North Atlantic region over the last five climatic cycles

机译：最近五个气候周期北大西洋极地和次极地区之间的冰河和冰间条件比较

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摘要

A multiparameter-based interpretation of sediment records from the northeast Atlantic and the western Nordic seas suggests that during the last 500,000 years only in marine isotopes stage (MIS) 11, 5e, and 1 were there somewhat comparable interglacial boundary conditions in both regions, i.e., strongly reduced occurrence of iceberg-rafted debris (IRD) and high carbonate bioproductivity. Although the northeast Atlantic experienced such conditions during all peak interglaciations, with the exception of MIS 7, planktic foraminiferal δ~(18)O from this region would still indicate that significantly colder sea surface temperatures (SST) prevailed during MIS 11 than during MIS 9, 5e, and 1. This assumption is corroborated by a continuous input of IRD into the western Nordic seas during MIS 11, implying a much steeper SST gradient between the polar and subpolar region and an overall reduced thermohaline activity in the polar latitudes. The iceberg proxy also reveals that maximum IRD discharge always happened during the final phase of glaciation and into early deglaciation (terminations). As these IRD records from the two regions are characterized by a high time coherency, it is concluded that short-term variability is a persistent feature of the glacial climate system.
机译：基于多参数的东北大西洋和北欧西部海域沉积物记录解释表明，在过去的500,000年中，仅在海洋同位素阶段（MIS）11、5e和1中，两个地区的冰川间边界条件相当，即，大大减少了冰山漂流碎片（IRD）的发生和高碳酸盐生物生产力。尽管东北大西洋在所有峰间冰期都经历了这种情况，但MIS 7除外，该地区的板状有孔虫δ〜（18）O仍表明MIS 11期间的海面温度（SST）比MIS 9期间明显低。 ，5e和1。这一假设得到了MIS 11期间IRD向北欧北部海域不断输入的支持，这意味着极地和亚极地区之间的SST梯度要陡得多，并且极地纬度的热盐碱活动总体上会降低。冰山代理人还显示，最大的IRD排放始终发生在冰川期的最后阶段和早期冰川期（终止）。由于这两个地区的IRD记录具有高度的时间一致性，因此可以得出结论，短期变化是冰川气候系统的一个持久特征。

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