North Atlantic ecosystem sensitivity to Holocene shifts in Meridional Overturning Circulation
North Atlantic ecosystem sensitivity to Holocene shifts in Meridional Overturning Circulation
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DOI：
10.1002/2015gl065999
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发表时间：
2016-01-16
影响因子：
5.2
通讯作者：
Roberts, J. Murray
中科院分区：
文献类型：
--
作者：
Douarin, Melanie;Elliot, Mary;Roberts, J. Murray
北大西洋气候在过去几千年中的快速变化是由海面/大气过程和深水形成速度共同驱动的。然而，由于缺乏高分辨率的古气候记录，全新世气候变化的记录仍然很少，它们对海洋生态系统的影响仍然未知。我们提出了一个4500年的绝对定年的海面放射性碳记录从东北大西洋冷水珊瑚。与目前认为海洋表面的变化发生在千年尺度周期的观点相反，我们的记录显示了表面环流的突然变化。变化集中在3.4、2.7、1.7和1.2kyrB.P.，并与大气重组有关。太阳辐照度可能影响了这些异常，但北大西洋深水对流的变化可能放大了这些信号。重要的是，我们提供了第一个证据，这些扰动在大西洋经向翻转环流导致冷水珊瑚生态系统的下降，从1.2到类似0.1 kyr B. P.。
Rapid changes in North Atlantic climate over the last millennia were driven by coupled sea surface/atmospheric processes and rates of deep water formation. Holocene climate changes, however, remain poorly documented due to a lack of high-resolution paleoclimate records, and their impacts on marine ecosystems remain unknown. We present a 4500year absolute-dated sea surface radiocarbon record from northeast Atlantic cold-water corals. In contrast to the current view that surface ocean changes occurred on millennial-scale cycles, our record shows more abrupt changes in surface circulation. Changes were centered at 3.4, 2.7, 1.7, and 1.2kyrB.P. and associated with atmospheric reorganization. Solar irradiance may have influenced these anomalies but changes in North Atlantic deep water convection are likely to have amplified these signals. Critically, we provide the first evidence that these perturbations in Atlantic Meridional Overturning Circulation led to the decline of cold-water coral ecosystems from 1.2 to similar to 0.1 kyr B.P.