Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions
Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions
复制标题
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
期刊:
影响因子:
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通讯作者:
A. Gray
中科院分区:
文献类型:
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作者:
H. Drake;A. Morrison;S. Griffies;J. Sarmiento;W. Weijer;A. Gray
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.
影响因子:
3.5
作者:
A. Thompson;J. Sallée
通讯作者:
A. Thompson;J. Sallée