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

Author(s): Drake, Henri F; Morrison, Adele K; Griffies, Stephen M; Sarmiento, Jorge L; Weijer, Wlbert; et al

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Abstract: 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.
Publication Date: 22-Jan-2018
Citation: Drake, Henri F., Adele K. Morrison, Stephen M. Griffies, Jorge L. Sarmiento, Wilbert Weijer, and Alison R. Gray. "Lagrangian timescales of Southern Ocean upwelling in a hierarchy of model resolutions." Geophysical Research Letters 45, no. 2 (2018): 891-898. doi:10.1002/2017GL076045.
DOI: doi:10.1002/2017GL076045
ISSN: 0094-8276
EISSN: 1944-8007
Pages: 891 - 898
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Research Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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