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首页> 外文期刊>Ocean Dynamics >Low-frequency sea level variability and impact of recent sea ice decline on the sea level trend in the Arctic Ocean from a high-resolution simulation
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Low-frequency sea level variability and impact of recent sea ice decline on the sea level trend in the Arctic Ocean from a high-resolution simulation

机译：低频海平面变异性和近期海冰率对高分辨率模拟的北极海洋趋势的影响

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摘要

The Arctic Ocean is undergoing significant changes, with rapid sea ice decline, unprecedented freshwater accumulation, and pronounced regional sea level rise. In this paper, we analyzed the sea level variation in the Arctic Ocean based on a global simulation with 4.5-km resolution in the Arctic Ocean using the multi-resolution Finite Element Sea Ice-Ocean Model (FESOM). The simulation reasonably reproduces both the main spatial features of the sea surface height (SSH) and its temporal evolution in the Arctic Ocean in comparison with tide gauge and satellite data. Using the model results, we investigated the low-frequency variability of the Arctic SSH. Both the first two dominant modes of the annual-mean SSH evolution in the Arctic Ocean present decadal variability and can be mainly attributed to the variability of the halosteric height, thus the freshwater content. The first mode can be explained by the Arctic Oscillation (AO). The AO-related atmospheric circulation drives the accumulation and release of freshwater in the Arctic deep basin and the consequent ocean mass change over the continental shelf, leading to the antiphase changes in SSH between the shelf seas and the deep basin. The second mode shows an antiphase oscillation between the two Arctic deep basins, the Amerasian and Eurasian Basins, which is driven by the Arctic dipole anomaly (DA). The DA-related wind anomaly causes a spatial redistribution of freshwater between the two basins, leading to the antiphase SSH changes. By using a dedicated sensitivity simulation in which the recent sea ice decline is eliminated, we find that the sea ice decline contributed considerably to the observed sea level rise in the Amerasian Basin in the recent decades. Although the sea ice decline did not change the mean SSH averaged over the Arctic Ocean, it significantly changed the spatial pattern of the SSH trend. Our finding indicates that both the wind regime and ongoing sea ice decline should be considered to better understand and predict the changes in regional sea level in the Arctic Ocean.
机译：北冰洋正在进行重大变化，海冰快速下降，前所未有的淡水积累，并发明的区域海平面上升。在本文中，我们根据全球模拟，在北极海洋中，使用多分辨率有限元海冰海洋模型（FESOM），在全球模拟中分析了北冰洋的海平面变化。与潮汐计和卫星数据相比，模拟合理地再现了海面高度（SSH）的主要空间特征及其在北冰海洋中的时间演进。使用模型结果，我们研究了北极SSH的低频变异性。北极海洋的年平均SSH演变的前两种主导模式都存在二等变异性，并且可以归因于剩余高度的可变性，从而淡水含量。第一模式可以由北极振荡（AO）解释。与AO相关的大气循环驱动了北极深盆地的淡水的积累和释放，随后的大陆架上的海洋大规模变化，导致货物和深层盆地之间的SSH变化。第二种模式显示了两个北极深盆地，亚美腺和欧亚盆地之间的反相振荡，由北极偶极异常（DA）驱动。 DA相关的风异常导致两种盆地之间的淡水空间再分布，导致反相SSH变化。通过采用近期海冰衰落的专用敏感性模拟，我们发现海冰下降促使近几十年来观察到的阿尔萨斯盆地的海平面上升。虽然海冰衰退没有改变平均北冰洋的平均SSH，但它显着改变了SSH趋势的空间模式。我们的发现表明，风力制度和持续的海冰率应该被认为是更好地理解并预测北冰洋区域海平面的变化。

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  • 来源
    《Ocean Dynamics》 |2020年第6期|787-802|共16页
  • 作者

    Kai Xiao; Meixiang Chen; Qiang Wang; Xuezhu Wang; Wenhao Zhang;

  • 作者单位

    College of Oceanography Hohai University No. 1 Xikang Road Nanjing 210098 China;

    College of Oceanography Hohai University No. 1 Xikang Road Nanjing 210098 China;

    Alfred-Wegener-Institut Helmholtz-Zentrum fuer Polar- und Meeresforschung Bremerhaven Germany;

    College of Oceanography Hohai University No. 1 Xikang Road Nanjing 210098 China Alfred-Wegener-Institut Helmholtz-Zentrum fuer Polar- und Meeresforschung Bremerhaven Germany;

    College of Oceanography Hohai University No. 1 Xikang Road Nanjing 210098 China Alfred-Wegener-Institut Helmholtz-Zentrum fuer Polar- und Meeresforschung Bremerhaven Germany;

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  • 正文语种 eng
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  • 关键词

    Arctic Ocean; Sea level; FESOM; Decadal variability; Halosteric height; Sea ice decline; Freshwater content;

    机译：北冰洋;海平面;融合;二等变异性;哈氏高度;海冰衰退;淡水含量;

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