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Meridional heat transport variability induced by mesoscale processes in the subpolar North Atlantic.
Nature Communications ( IF 16.6 ) Pub Date : 2018-03-19 , DOI: 10.1038/s41467-018-03134-x
Jian Zhao , Amy Bower , Jiayan Yang , Xiaopei Lin , N. Penny Holliday

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.

中文翻译:

在北极亚极中尺度过程引起的子午线热传输变异性。

海洋在全球气候变化中的作用在很大程度上取决于其热传递。因此,了解海洋子午热传输(MHT)的变异性是一个基本问题。现有的观测和建模证据表明,MHT的变化主要由大规模的海洋环流决定。在这里,使用东亚极地北大西洋的新原位观测数据和涡旋分解数值模型,我们显示了水平尺度约为10-100 km的高能中尺度涡旋深刻地调节了从季节内到年际的时间尺度上的MHT变异性。 。我们的研究结果表明,由于中尺度过程而引起的速度变化对于MHT区域(在亚流域内)和整个北极亚极产生了很大的变化。
更新日期:2018-03-19
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