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首页> 外文期刊>Journal of Physical Oceanography >Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions
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Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions

机译：全球冰川雪球地球条件下的海洋环流：稳态解决方案

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摘要

Between ～750 and 635 million years ago, during the Neoproterozoic era, the earth experienced at least two significant, possibly global, glaciations, termed "Snowball Earth." While many studies have focused on the dynamics and the role of the atmosphere and ice flow over the ocean in these events, only a few have investigated the related associated ocean circulation, and no study has examined the ocean circulation under a thick (～1 km deep) sea ice cover, driven by geothermal heat flux. Here, a thick sea ice-flow model coupled to an ocean general circulation model is used to study the ocean circulation under Snowball Earth conditions. The ocean circulation is first investigated under a simplified zonal symmetry assumption, and (ⅰ) strong equatorial zonal jets and (ⅱ) a strong meridional overturning cell are found, limited to an area very close to the equator. The authors derive an analytic approximation for the latitude-depth ocean dynamics and find that the extent of the meridional overturning circulation cell only depends on the horizontal eddy viscosity and β (the change of the Coriolis parameter with latitude). The analytic approximation closely reproduces the numerical results. Three-dimensional ocean simulations, with reconstructed Neoproterozoic continental configuration, confirm the zonally symmetric dynamics and show additional boundary currents and strong upwelling and downwelling near the continents.
机译：在大约750至6.35亿年前的新元古代时期，地球经历了至少两次重要的，可能是全球性的冰川活动，称为“雪球地球”。尽管许多研究集中于这些事件中海洋上空大气和冰流的动力学及其作用，但只有少数研究了相关的海洋环流，而没有研究研究过厚（〜1 km）的海洋环流。深）海冰覆盖，由地热热通量驱动。在此，将厚海冰流模型与海洋总环流模型相结合，用于研究“雪球地球”条件下的海洋环流。首先在简化的纬向对称性假设下研究了海洋环流，并且发现了（ⅰ）强烈的赤道纬向射流和（ⅱ）强大的子午翻转单元，并将其限制在非常靠近赤道的区域。作者推导了纬向深度海洋动力学的解析近似值，发现子午翻转循环单元的范围仅取决于水平涡流粘度和β（科里奥利参数随纬度的变化）。解析近似值可以精确地再现数值结果。具有重新构造的新元古代大陆构造的三维海洋模拟，证实了区域对称的动力学，并显示了附加的边界流以及各大陆附近强烈的上涌和下涌。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第1期|24-43|共20页
  • 作者

    Yosef Ashkenazy; Hezi Gildor; Martin Losch; Eli Tziperman;

  • 作者单位

    Department of Solar Energy and Environmental Physics, BIDR, Ben-Gurion University, Midreshet Ben-Gurion, 84990, Israel;

    The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel;

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

    Department of Earth and Planetary Sciences and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts;

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