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首页> 外文期刊>Paleoceanography >Surface changes in the eastern Labrador Sea around the onset of the Little Ice Age
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Surface changes in the eastern Labrador Sea around the onset of the Little Ice Age

机译：小冰河时代到来之初，拉布拉多海东部的表面变化

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摘要

Despite the relative climate stability of the present interglacial, it has been punctuated by several centennial-scale climatic oscillations; the latest of which are often colloquially referred to as the Medieval Climatic Anomaly (MCA) and the Little Ice Age (LIA). The most favored explanation for the cause of these anomalies is that they were triggered by variability in solar irradiance and/or volcanic activity and amplified by ocean-atmosphere-sea ice feedbacks. As such, changes in the strength of the Atlantic Meridional Overturning Circulation (AMOC) are widely believed to have been involved in the amplification of such climatic oscillations. The Labrador Sea is a key area of deep water formation. The waters produced here contribute approximately one third of the volume transport of the deep limb of the AMOC and drive changes in the North Atlantic surface hydrography and subpolar gyre circulation. In this study, we present multiproxy reconstructions from a high-resolution marine sediment core located south of Greenland that suggest an increase in the influence of polar waters reaching the Labrador Sea close to MCA-LIA transition. Changes in freshwater forcing may have reduced the formation of Labrador Sea Water and contributed toward the onset of the LIA cooling.
机译：尽管目前的冰间期具有相对稳定的气候，但它仍被数个百年尺度的气候振荡所打断。最新的通俗地称为中世纪气候异常（MCA）和小冰河时期（LIA）。对于这些异常原因的最有利的解释是，它们是由太阳辐照度和/或火山活动的变化触发的，并由海洋-大气-海冰反馈放大。因此，人们普遍认为大西洋子午向翻转环流（AMOC）强度的变化与这种气候振荡的放大有关。拉布拉多海是深水形成的关键区域。这里产生的水约占AMOC深肢体积运输量的三分之一，并推动北大西洋地表水文学和亚极回旋环流的变化。在这项研究中，我们提出了位于格陵兰南部的高分辨率海洋沉积物核心的多代理重建方法，这表明极性水域影响接近MCA-LIA过渡的拉布拉多海的影响有所增加。淡水强迫的变化可能减少了拉布拉多海水的形成，并促进了LIA冷却的开始。

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