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Diathermal Heat Transport in a Global Ocean Model

机译：全球海洋模型中的绝热传热

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摘要

The rate at which the ocean moves heat from the tropics toward the poles, and from the surface into the interior, depends on diabatic surface forcing and diffusive mixing. These diabatic processes can be isolated by analyzing heat transport in a temperature coordinate (the diathermal heat transport). This framework is applied to a global ocean sea ice model at two horizontal resolutions (1/4 degrees and 1/10 degrees) to evaluate the partioning of the diathermal heat transport between different mixing processes and their spatial and seasonal structure. The diathermal heat transport peaks around 22 degrees C at 1.6 PW, similar to the peak meridional heat transport. Diffusive mixing transfers this heat from waters above 22 degrees C, where surface forcing warms the tropical ocean, to temperatures below 22 degrees C where midlatitude waters are cooled. In the control 1/4 degrees simulation, half of the parameterized vertical mixing is achieved by background diffusion, to which sensitivity is explored. The remainder is associated with parameterizations for surface boundary layer, shear instability, and tidal mixing. Nearly half of the seasonal cycle in the peak vertical mixing heat flux is associated with shear instability in the tropical Pacific cold tongue, highlighting this region's global importance. The framework presented also allows for quantification of numerical mixing associated with the model's advection scheme. Numerical mixing has a substantial seasonal cycle and increases to compensate for reduced explicit vertical mixing. Finally, applied to Argo observations the diathermal framework reveals a heat content seasonal cycle consistent with the simulations. These results highlight the utility of the diathermal framework for understanding the role of diabatic processes in ocean circulation and climate.
机译：海洋将热量从热带转移到两极，再从表面转移到内部的速度，取决于非绝热表面强迫和扩散混合。这些非绝热过程可以通过分析温度坐标中的热传递（透热热传递）来隔离。该框架应用于两个水平分辨率（1/4度和1/10度）的全球海洋海冰模型，以评估不同混合过程之间的地热传热分配及其空间和季节结构。高温热传递在1.6 PW时在22摄氏度左右达到峰值，类似于子午热传递的峰值。扩散混合将热量从表面强迫迫使热带海洋加热到22摄氏度以上的水转移到中纬度水被冷却的22摄氏度以下的温度。在1/4度控制模拟中，参数化垂直混合的一半是通过背景扩散实现的，对此进行了探索。其余与表面边界层，剪切不稳定性和潮汐混合的参数化相关。垂直混合热通量峰值中近一半的季节性周期与热带太平洋冷舌的剪切不稳定性有关，这突出了该地区的全球重要性。提出的框架还允许量化与模型对流方案相关的数值混合。数值混合具有很大的季节性周期，并且会增加以补偿显式垂直混合的减少。最后，将其应用于Argo观测，透热框架揭示了与模拟一致的热含量季节周期。这些结果突出了透热框架在了解非绝热过程在海洋环流和气候中的作用方面的实用性。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第1期|141-161|共21页
  • 作者

    Holmes Ryan M.; Zika Jan D.; England Matthew H.;

  • 作者单位

    Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia|Univ New South Wales, Australian Res Council Ctr Excellence Climate Ext, Sydney, NSW, Australia|Univ New South Wales, Sch Math & Stat, Sydney, NSW, Australia;

    Univ New South Wales, Sch Math & Stat, Sydney, NSW, Australia;

    Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia|Univ New South Wales, Australian Res Council Ctr Excellence Climate Ext, Sydney, NSW, Australia;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Mixing; Diabatic heating; Heat budgets; fluxes; Ocean models; Subgrid-scale processes; Seasonal cycle;

    机译：混合;非绝热加热;热量预算;通量;海洋模型;亚网格规模过程;季节周期;

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