Rapid coastal deoxygenation due to ocean circulation shift in the NW Atlantic.
Rapid coastal deoxygenation due to ocean circulation shift in the NW Atlantic.
复制标题
DOI：
10.1038/s41558-018-0263-1
复制
发表时间：
2018-10
影响因子：
30.7
通讯作者：
Dunne JP
中科院分区：
文献类型：
--
作者：
Claret M;Galbraith ED;Palter JB;Bianchi D;Fennel K;Gilbert D;Dunne JP
全球观测表明，在过去 50 年中，海洋损失了大约 2% 的氧气库存，这对海洋生态系统产生了重要影响。西北大西洋沿岸水域的变化率各不相同，显示出长期下降速度，大大超过了全球和北大西洋盆地的平均脱氧率。然而，过去的工作无法解决当地过程大规模气候强迫的机制。在这里，我们利用水文证据表明拉布拉多洋流的退却在西北大西洋陆架的脱氧中发挥着关键作用。高分辨率全球气候-生物地球化学耦合模型再现了观察到的该地区饱和氧浓度的下降，这是由于向赤道流动的拉布拉多洋流退缩以及相关的大陆架向缺氧的亚热带水域的转变所驱动的。陆架水性质变化背后的动力变化与模拟大西洋经向翻转环流的放缓相关。我们的研究结果提供了强有力的证据，表明拉布拉多洋流正在发生百年规模的重大变化，并强调了海洋动力学在下个世纪影响沿海脱氧的潜力。
Global observations show that the ocean lost approximately 2% of its oxygen inventory over the last five decades, with important implications for marine ecosystems. The rate of change varies with northwest Atlantic coastal waters showing a long-term drop that vastly outpaces the global and North Atlantic basin mean deoxygenation rates. However, past work has been unable to resolve mechanisms of large-scale climate forcing from local processes. Here, we use hydrographic evidence to show a Labrador Current retreat is playing a key role in the deoxygenation on the northwest Atlantic shelf. A high-resolution global coupled climate-biogeochemistry model reproduces the observed decline of saturation oxygen concentrations in the region, driven by a retreat of the equatorward-flowing Labrador Current and an associated shift toward more oxygen-poor subtropical waters on the shelf. The dynamical changes underlying the shift in shelf water properties are correlated with a slowdown in the simulated Atlantic Meridional Overturning Circulation. Our results provide strong evidence that a major, centennial-scale change of the Labrador Current is underway, and highlight the potential for ocean dynamics to impact coastal deoxygenation over the coming century.
登录
查看更多内容
影响因子：
5.2
作者：
Long, Matthew C.;Deutsch, Curtis;Ito, Taka
通讯作者：
Ito, Taka
影响因子：
4.5
作者：
Gilbert, D;Sundby, B;Tremblay, GH
通讯作者：
Tremblay, GH
DOI：
10.1139/f76-270
发表时间：
1976-01-01
期刊：
JOURNAL OF THE FISHERIES RESEARCH BOARD OF CANADA
影响因子：
--
作者：
GATIEN, MG
通讯作者：
GATIEN, MG
影响因子：
1.2
作者：
Lavoie, Diane;Lambert, Nicolas;Gilbert, Denis
通讯作者：
Gilbert, Denis
影响因子：
3.7
作者：
Brennan CE;Blanchard H;Fennel K
通讯作者：
Fennel K