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The Representation of Ocean Circulation and Variability in Thermodynamic Coordinates

机译：热力学坐标系中海洋环流和变率的表示

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摘要

The ocean's circulation is analyzed in Absolute Salinity S_A and Conservative Temperature Θ coordinates. It is separated into 1) an advective component related to geographical displacements in the direction normal to S_A and Θ isosurfaces and 2) into a local component, related to local changes in S_A-Θ values, without a geographical displacement. In this decomposition, the sum of the advective and local components of the circulation is equivalent to the material derivative of S_A and Θ. The sum is directly related to sources and sinks of salt and heat. The advective component is represented by the advective thermohaline streamfunction ψ_(S_A Θ)~(adv) After removing a trend, the local component can be represented by the local thermohaline stream-function ψ_(S_A Θ)~(loc) Here, ψ_(S_A Θ)~(loc) can be diagnosed using a monthly averaged time series of S_A and Θ from an observational dataset. In addition, ψ_(S_A Θ)~(adv)andψ_(S_A Θ)~(loc) determined from a coupled climate model. The dia-thermohaline streamfunction ψ_(S_A Θ)~(dia) is the sum ofψ_(S_A Θ)~(adv) and ψ_(S_A Θ)~(loc) and represents the nondivergent dia-thermohaline circulation in S_A-Θ coordinates. The diathermohaline trend, resulting from the trend in the local changes of S_A and Θ, quantifies the redistribution of the ocean's volume in S_A-Θ coordinates over time. It is argued that the diathermohaline streamfunction provides a powerful tool for the analysis of and comparison among ocean models and observation-based gridded climatologies.
机译：使用绝对盐度S_A和保守温度Θ坐标分析海洋的环流。它分为1）与在垂直于S_A和Θ等值面的方向上的地理位移有关的对流分量，以及2）到与S_A-Θ值的局部变化有关的局部分量，而没有地理位移。在这种分解中，循环的对流分量和局部分量的总和等于S_A和Θ的物质导数。总和与盐和热的来源和汇直接相关。对流分量由对流热盐流函数ψ_（S_AΘ）〜（adv）表示。去除趋势后，局部分量可以由局部热盐流函数ψ_（S_AΘ）〜（loc）表示。可以使用来自观测数据集的S_A和Θ的每月平均时间序列来诊断S_AΘ（loc）。另外，从耦合气候模型确定ψ_（S_AΘ）〜（adv）和ψ_（S_AΘ）〜（loc）。 dia-thermohaline流函数ψ_（S_AΘ）〜（dia）是ψ_（S_AΘ）〜（adv）和ψ_（S_AΘ）〜（loc）的总和，并表示S_A-Θ坐标中的非散度dia-thermohaline循环。由S_A和Θ的局部变化趋势引起的透热盐碱化趋势量化了海洋体积随S_A-Θ坐标的重新分布。有人认为，透热卤素流函数为海洋模型和基于观测的网格气候的分析和比较提供了强大的工具。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第7期|1735-1750|共16页
  • 作者

    Sjoerd Groeskamp; Jan D. Zika; Trevor J. McDougall; Bernadette M. Sloyan; Frederic Laliberte;

  • 作者单位

    CSIRO Wealth from Oceans National Research Flagship, and Institute for Marine and Atmospheric Studies,University of Tasmania, Hobart, Tasmania, Australia CSIRO Wealth from Oceans National Research Flagship, Castray Esplanade,Hobart, TAS 7000, Australia;

    University of Southampton, National Oceanography Centre, Southampton, United Kingdom;

    School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales, Australia;

    CSIRO Wealth from Oceans National Research Flagship, and Centre for Australian Weather and Climate Research,CSIRO Marine and Atmospheric Research, Hobart, Tasmania, Australia;

    Department of Physics, University of Toronto, Toronto, Ontario, Canada;

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