Can we reconstruct mean and eddy fluxes from Argo floats
Can we reconstruct mean and eddy fluxes from Argo floats
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我们可以重建 Argo 浮标的平均通量和涡通量吗
DOI：
10.1016/j.ocemod.2017.10.004
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发表时间：
2017
期刊：
影响因子：
3.2
通讯作者：
Jean
中科院分区：
文献类型：
--
作者：
C. Chapman;Jean
Argo 浮子阵列提供的深部速度估计能力可重建平均量和涡流量（例如热通量），并使用理想化的涡流解析数值模型来解决，该模型旨在代表南大洋。该模型植入了 450 个“虚拟”Argo 浮标，然后在模型场中平流运行 10 年。然后，通过将虚拟 Argo 浮标的重建速度、涡流动能和热通量与模型输出的“真实”值进行比较，系统地研究浮标实验的时间采样、阵列密度和长度的作用。我们发现，尽管所有三个量的误差随着时间采样率、浮点数和实验持续时间的增加而减少，但误差接近渐近极限。因此，当这些参数超过此限制时，仅观察到误差的边际减小。真实 Argo 阵列的参数在缩放以匹配虚拟 Argo 阵列的参数时，通常落在渐近区域附近或之内。使用数值模型，演示了一种计算横流热通量的方法。然后使用 Ollitrault 和 Rannou (2013) 的 ANDRO 数据集将该方法应用于 5 年的 Argo 导出速度，以估计南大洋极锋 1000m 深度处的涡流热通量。热通量集中在大型测深特征的下游区域，这与之前的研究结果一致。在此深度发现了 2±0.5 TW 的极锋热传输，其中 90% 以上集中在极锋所跨越的总经度的不到 20% 处。最后，讨论了这项工作对监测海洋气候的影响。
The capacity of deep velocity estimates provided by the Argo float array to reconstruct both mean and eddying quantities, such as the heat flux, is addressed using an idealized eddy resolving numerical model, designed to be representative of the Southern Ocean. The model is seeded with 450 “virtual” Argo floats, which are then advected by the model fields for 10 years. The role of temporal sampling, array density and length of the float experiment are then systematically investigated by comparing the reconstructed velocity, eddy kinetic energy and heat-flux from the virtual Argo floats with the “true” values from the model output. We find that although errors in all three quantities decrease with increasing temporal sampling rate, number of floats and experiment duration, the error approaches an asymptotic limit. Thus, as these parameters exceed this limit, only marginal reductions in the error are observed. The parameters of the real Argo array, when scaled to match those of the virtual Argo array, generally fall near to, or within, the asymptotic region. Using the numerical model, a method for the calculation of cross-stream heat-fluxes is demonstrated. This methodology is then applied to 5 years of Argo derived velocities using the ANDRO dataset of Ollitrault & Rannou (2013) in order to estimate the eddy heat flux at 1000m depth across the Polar Front in the Southern Ocean. The heat-flux is concentrated in regions downstream of large bathymetric features, consistent with the results of previous studies. 2 ± 0.5 TW of heat transport across the Polar Front at this depth is found, with more than 90% of that total concentrated in less than 20% of the total longitudes spanned by the front. Finally, the implications of this work for monitoring the ocean climate are discussed.
影响因子：
3.5
作者：
A. Thompson;J. Sallée
通讯作者：
A. Thompson;J. Sallée
Argo 浮标轨迹显示南大洋的水平混合
DOI：
10.1002/2015jc011440
发表时间：
2016
期刊：
Journal of Geophysical Research: Oceans
影响因子：
--
作者：
Roach, Christopher J.;Balwada, Dhruv;Speer, Kevin
通讯作者：
Speer, Kevin