Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions

Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions
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模型分辨率层次中南大洋上升流的拉格朗日时间尺度

DOI:
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发表时间:
2018
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影响因子:
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通讯作者:
A. Gray
A. Gray
中科院分区:
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文献类型:
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作者:
H. Drake;A. Morrison;S. Griffies;J. Sarmiento;W. Weijer;A. Gray

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本文利用拉格朗日粒子跟踪方法,在一系列模式中研究了绕极深水(CDW)的上升流路径和时间尺度。随着海洋分辨率从1°到0.25°再到0.1°,CDW上升流的拉格朗日时间尺度从87年减小到31年再到17年。我们将时间尺度上的一些差异归因于涡流场的强度,正如高分辨率模型速度场的时间退化所证明的那样。与时间尺度相关性一致,我们发现,在1°模型中,平均拉格朗日粒子完成3.2个环极循环,而在0.1°模型中,平均拉格朗日粒子完成0.9个环极循环。这些差异表明,平流时间尺度和上升流CDW的流域间合并可能被粗分辨率模式高估,可能影响百年尺度气候变化预测的技能。
In this paper we study upwelling pathways and timescales of Circumpolar Deep Water (CDW) in a hierarchy of models using a Lagrangian particle tracking method. Lagrangian timescales of CDW upwelling decrease from 87 years to 31 years to 17 years as the ocean resolution is refined from 1° to 0.25° to 0.1°. We attribute some of the differences in timescale to the strength of the eddy fields, as demonstrated by temporally degrading high‐resolution model velocity fields. Consistent with the timescale dependence, we find that an average Lagrangian particle completes 3.2 circumpolar loops in the 1° model in comparison to 0.9 loops in the 0.1° model. These differences suggest that advective timescales and thus interbasin merging of upwelling CDW may be overestimated by coarse‐resolution models, potentially affecting the skill of centennial scale climate change projections.
DOI: 10.1175/jpo-d-11-0135.1
发表时间: 2012-06
影响因子: 3.5
作者:
A. Thompson;J. Sallée
通讯作者: A. Thompson;J. Sallée