Multicentennial record of Labrador Sea primary productivity and sea-ice variability archived in coralline algal barium.
Multicentennial record of Labrador Sea primary productivity and sea-ice variability archived in coralline algal barium.
复制标题
DOI：
10.1038/ncomms15543
复制
发表时间：
2017-06-01
影响因子：
16.6
通讯作者：
Hou A
中科院分区：
文献类型：
--
作者：
Chan P;Halfar J;Adey W;Hetzinger S;Zack T;Moore GWK;Wortmann UG;Williams B;Hou A
近年来，北极海冰的加速变暖和融化与浮游植物生产力的显著增加有关。在这里，利用多代理的方法，我们重建一个每年解决拉布拉多海生产力的记录相关的海冰变化拉布拉多，加拿大，延伸到小冰期（LIA; 1646 AD）。在长寿珊瑚藻中测量的钡钙比（Ba/Ca）和碳同位素（δ 13 C）与海冰变化的观测记录和代理记录都表现出显着的相关性，并显示出与大西洋年代际振荡（AMO）的时间和相位大致一致的持续协变模式。结果表明，在亚北极西北大西洋与AMO冷却阶段在LIA生产力降低，其次是逐步增加，从1910年到目前的水平，前所未有的在过去的363年。随着预计在未来世纪变暖和淡化的加剧，浮游植物生产力的增加预计将从根本上改变海洋生态系统。近几十年来，北极海冰的持续变暖和融化导致拉布拉多海浮游植物生产力增加。在这里，作者利用一种新的每年解决palaeoproxy，并提出，最近观察到的增加表面海洋生产力是无与伦比的，因为小冰期。
Accelerated warming and melting of Arctic sea-ice has been associated with significant increases in phytoplankton productivity in recent years. Here, utilizing a multiproxy approach, we reconstruct an annually resolved record of Labrador Sea productivity related to sea-ice variability in Labrador, Canada that extends well into the Little Ice Age (LIA; 1646 AD). Barium-to-calcium ratios (Ba/Ca) and carbon isotopes (δ13C) measured in long-lived coralline algae demonstrate significant correlations to both observational and proxy records of sea-ice variability, and show persistent patterns of co-variability broadly consistent with the timing and phasing of the Atlantic Multidecadal Oscillation (AMO). Results indicate reduced productivity in the Subarctic Northwest Atlantic associated with AMO cool phases during the LIA, followed by a step-wise increase from 1910 to present levels—unprecedented in the last 363 years. Increasing phytoplankton productivity is expected to fundamentally alter marine ecosystems as warming and freshening is projected to intensify over the coming century. Continued warming and melting of Arctic sea-ice have led to increases in Labrador Sea phytoplankton productivity in recent decades. Here, the authors utilize a novel annually resolved palaeoproxy and propose that the recently observed increase in surface ocean productivity is unmatched since the Little Ice Age.