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Late Eemian warming in the Nordic Seas as seen in proxy data and climate models

机译：从代用资料和气候模型可以看出，北欧海中的晚艾米亚变暖

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摘要

We analyze a transient simulation of the last glacial inception in a climate model of intermediate complexity, focusing on sea ice-ocean circulation dynamics in the North Atlantic and Nordic Seas. As northern high-latitude summer insolation decreases toward the end of the Eemian interglacial, Arctic sea ice export to the North Atlantic increases. This surface fresh water transport weakens deep water formation in the North Atlantic and the near-surface circulation of the subpolar gyre. As a consequence, the relative contribution of subpolar gyre waters to the Atlantic inflow into the Nordic Seas is reduced, giving way to more warm and saline subtropical waters from the North Atlantic Current. We thus find an episode of relatively high heat and salt transport into the Nordic Seas during the last glacial inception between 119,000 and 115,000 years before present. This stabilizes deep ocean convection in the region and warms Scandinavia during a phase of low insolation. These findings are in good agreement with proxy data from the Nordic Seas and North Atlantic. At the end of the warm interval, sea surface temperature drops by about 3C, marking the onset of large-scale glacier growth over Scandinavia.
机译：我们在中等复杂度的气候模型中分析了最后一次冰期开始的瞬态模拟，重点是北大西洋和北欧海中的海冰海洋循环动力学。随着北部高纬度夏季日射量在艾米期间冰期末期减少，北极向北大西洋的海冰出口增加。这种表层淡水运输减弱了北大西洋的深水形成和亚极回旋的近地表环流。结果，减少了极地回旋水对大西洋流入北欧海域的相对贡献，而让位于北大西洋洋流的更多温暖和咸的亚热带水。因此，我们发现在距今119,000至115,000年之间的最后一次冰河期，相对较高的热量和盐分运入北欧海。这使该地区的深海对流稳定，并在日照低的阶段使斯堪的纳维亚半岛变暖。这些发现与北欧海和北大西洋的代理数据非常吻合。在温暖的时间间隔结束时，海面温度下降了约3°C，标志着斯堪的纳维亚半岛开始大规模的冰川生长。

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