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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Arctic Ocean warming and its consequences for the Denmark Strait overflow
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Arctic Ocean warming and its consequences for the Denmark Strait overflow

机译：北冰洋变暖及其对丹麦海峡溢流的影响

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Two anomalously warm inflow pulses into the Atlantic Water Layer of the Arctic Ocean have occurred since the late 1980s. As a consequence temperatures of the Arctic basins at 200-800 m depth have increased considerably in comparison to earlier decades. The warm inflow pulses also had a low density. Owing to the decadal time scale of the circulation in the Atlantic Water Layer large pools of anomalously light water have thereby formed in the Arctic Ocean. These will slowly drain back south into the Nordic Seas. We submit that they will be able to influence the overflows into the Atlantic across the Greenland-Scotland ridges. The Atlantic meridional overturning is fed by these overflows. Our model experiments indicate that the low-density anomalies from the Arctic Ocean may be able to reduce the Denmark Strait overflow 15-25 years after the entrance of the original signal through Fram Strait into the Arctic Ocean. The actual size of the reduction depends on the exact path and speed of the anomalies inside the Arctic proper and on local processes in the Arctic Ocean and the Nordic Sea.
机译：自1980年代后期以来，发生了两次异常温暖的流入北冰洋大西洋水流的脉冲。结果，与前几十年相比，200-800 m深度的北极盆地的温度已大大提高。温暖的流入脉冲也具有低密度。由于大西洋水层循环的年代际尺度，因此在北冰洋形成了大量异常轻水。这些将缓慢地向南排入北欧海域。我们认为，它们将能够影响跨格陵兰-苏格兰山脊的大西洋溢流。这些溢流是大西洋经向倾覆的原因。我们的模型实验表明，北冰洋的低密度异常可能能够减少原始信号通过Fram海峡进入北冰洋后15-25年的丹麦海峡溢流。减少量的实际大小取决于北极内部的异常的确切路径和速度以及北冰洋和北欧海中的局部过程。

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