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

Abstract

Here, 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. In conclusion, 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States)
  2. Princeton Univ., NJ (United States); NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1477659
Report Number(s):
LA-UR-18-21356
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC52-06NA25396; SC0012457
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 2; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; meridional overturning circulation; Southern Ocean; Circumpolar Deep Water; upwelling eddy parameterization; ocean modeling

Citation Formats

Drake, Henri F., Morrison, Adele K., Griffies, Stephen M., Sarmiento, Jorge L., Weijer, Wilbert, and Gray, Alison R. Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions. United States: N. p., 2018. Web. doi:10.1002/2017GL076045.
Drake, Henri F., Morrison, Adele K., Griffies, Stephen M., Sarmiento, Jorge L., Weijer, Wilbert, & Gray, Alison R. Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions. United States. doi:10.1002/2017GL076045.
Drake, Henri F., Morrison, Adele K., Griffies, Stephen M., Sarmiento, Jorge L., Weijer, Wilbert, and Gray, Alison R. Mon . "Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions". United States. doi:10.1002/2017GL076045. https://www.osti.gov/servlets/purl/1477659.
@article{osti_1477659,
title = {Lagrangian Timescales of Southern Ocean Upwelling in a Hierarchy of Model Resolutions},
author = {Drake, Henri F. and Morrison, Adele K. and Griffies, Stephen M. and Sarmiento, Jorge L. and Weijer, Wilbert and Gray, Alison R.},
abstractNote = {Here, 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. In conclusion, 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 = {10.1002/2017GL076045},
journal = {Geophysical Research Letters},
number = 2,
volume = 45,
place = {United States},
year = {2018},
month = {1}
}

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