Changes in the strength of the Nordic Seas Overflows over the past 3000 years
Changes in the strength of the Nordic Seas Overflows over the past 3000 years
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过去3000年来北欧海溢流强度的变化
DOI：
10.1016/j.quascirev.2015.06.007
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发表时间：
2015
影响因子：
4
通讯作者：
Moffa-Sanchez P
中科院分区：
文献类型：
--
作者：
Moffa-Sanchez P
北欧海溢流构成了大西洋经向翻转环流（AMOC）深层分支最密集的部分。溢流强度的变化在过去和将来都可能对气候产生重要影响。然而，AMOC深肢的多年代际至千年变化及其与全新世北大西洋气候变率的潜在关系的证据仍然薄弱。在这里，我们分别从冰岛东部和西部的两个北欧溢流，冰岛-苏格兰溢流（ISOW）和丹麦海峡溢流（DSOW）的直接路径上，从次年代际到年代际分解的沉积物岩心中，提供了粒度数据，作为近底流速度的代表。结果表明，重建的北欧溢流活力变化与北大西洋地区记录的众所周知的百年尺度气候变率之间没有明确的关系。然而，在过去3000年的溢流强度记录中，都发现了明确的千年尺度趋势，这可能与新冰川期北半球夏季日照减少导致的北欧海水文重组有关。ISOW和DSOW近底部流速重建的比较表明，在过去3000年里，冰岛东部和西部的北欧海溢流之间存在反相位关系。在气候模式中已经观察到这一特征，这可能是由于深海形成地点的变化对北欧海域大气模式变化的响应。
The Nordic Seas Overflows constitute the densest component of the deep limb of the Atlantic Meridional Overturning Circulation (AMOC). Changes in the vigour of the overflows may have had important climatic effects in the past and may also have in the future. Yet, evidence for multidecadal to millennial changes in the deep limb of the AMOC and their potential relationship to North Atlantic climate variability during the Holocene remains weakly constrained. Here we present grain size data, as a proxy for near-bottom current speed, from sub-decadal to decadally resolved sediment cores located in the direct pathway of the two Nordic Overflows east and west of Iceland, the Iceland-Scotland Overflow Water (ISOW) and the Denmark Strait Overflow Water (DSOW), respectively. The results show no clear relationship between reconstructed changes in the vigour of the Nordic Overflows and the well-known periods of centennial-scale climate variability recorded in the North Atlantic region. However, well-defined millennial-scale trends are found in both of the overflow strength records over the last 3000 years, which were possibly related to hydrographic reorganizations in the Nordic Seas, driven by the decrease in Northern Hemisphere summer insolation over the Neoglacial period. A comparison between the near-bottom flow speed reconstructions from ISOW and DSOW suggests an anti-phased relationship between the Nordic Seas Overflows east and west of Iceland over the last 3000 years. This feature has been observed in climate models potentially as a result of shifts in the deep water formation sites as a response to changes in atmospheric patterns over the Nordic Seas.
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