Meridional heat transport variability induced by mesoscale processes in the subpolar North Atlantic.

Meridional heat transport variability induced by mesoscale processes in the subpolar North Atlantic.
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DOI:
10.1038/s41467-018-03134-x
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发表时间:
2018-03-19
影响因子:
16.6
通讯作者:
Penny Holliday N
Penny Holliday N
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhao J;Bower A;Yang J;Lin X;Penny Holliday N

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海洋在全球气候变化中的作用很大程度上取决于其热量传输。因此,了解海洋经向热传输(MHT)的变化是一个基本问题。普遍的观测和建模证据表明,MHT 的变化主要是由大规模海洋环流决定的。在这里,利用北大西洋东部副极地的新现场观测和涡旋解析数值模型,我们表明水平尺度约为10-100公里的高能中尺度涡旋深刻地调节了从季节内到年际时间尺度上的MHT变化。我们的结果表明,中尺度过程引起的速度变化对 MHT 区域(子流域内)和整个副极地北大西洋产生了显着的变化。这些发现对于理解北大西洋副极地向极地热传输变化的机制具有重要意义,北大西洋是热量和碳封存、冰海相互作用和生物生产力的关键区域。传统上认为海洋热传输是由大范围的海洋环流决定的。新的发现表明,冰岛盆地的高能中尺度过程深刻地调节了从季节内到年际的时间尺度上的海洋热传输变化。
The ocean’s role in global climate change largely depends on its heat transport. Therefore, understanding the oceanic meridional heat transport (MHT) variability is a fundamental issue. Prevailing observational and modeling evidence suggests that MHT variability is primarily determined by the large-scale ocean circulation. Here, using new in situ observations in the eastern subpolar North Atlantic Ocean and an eddy-resolving numerical model, we show that energetic mesoscale eddies with horizontal scales of about 10–100 km profoundly modulate MHT variability on time scales from intra-seasonal to interannual. Our results reveal that the velocity changes due to mesoscale processes produce substantial variability for the MHT regionally (within sub-basins) and the subpolar North Atlantic as a whole. The findings have important implications for understanding the mechanisms for poleward heat transport variability in the subpolar North Atlantic Ocean, a key region for heat and carbon sequestration, ice–ocean interaction, and biological productivity. The oceanic heat transport is traditionally believed to be determined by the large-scale ocean circulation. New findings suggest that the energetic mesoscale processes in the Iceland Basin profoundly modulate the oceanic heat transport variability on time scales from intra-seasonal to interannual.
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