Lagrangian timescales of Southern Ocean upwelling in a hierarchy of model resolutions
Drake, Henri F.
Morrison, Adele K.
Griffies, Stephen M.
Sarmiento, Jorge L.
Gray, Alison R.
MetadataShow full item record
KeywordMeridional overturning circulation; Southern Ocean; Circumpolar Deep Water; Upwelling; Eddy parameterization; Ocean modeling
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.
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 45 (2018): 891–898, doi:10.1002/2017GL076045.
Suggested CitationArticle: 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", Geophysical Research Letters 45 (2018): 891–898, DOI:10.1002/2017GL076045, https://hdl.handle.net/1912/9630
Showing items related by title, author, creator and subject.
Variability in the mechanisms controlling Southern Ocean phytoplankton bloom phenology in an ocean model and satellite observations Rohr, Tyler; Long, Matthew C.; Kavanaugh, Maria T.; Lindsay, Keith; Doney, Scott C. (John Wiley & Sons, 2017-05-30)A coupled global numerical simulation (conducted with the Community Earth System Model) is used in conjunction with satellite remote sensing observations to examine the role of top-down (grazing pressure) and bottom-up ...
Evaluating Southern Ocean biological production in two ocean biogeochemical models on daily to seasonal timescales using satellite chlorophyll and O2 / Ar observations Jonsson, Bror F.; Doney, Scott C.; Dunne, John P.; Bender, Michael L. (Copernicus Publications on behalf of the European Geosciences Union, 2015-02-04)We assess the ability of ocean biogeochemical models to represent seasonal structures in biomass and net community production (NCP) in the Southern Ocean. Two models are compared to observations on daily to seasonal ...
Jonsson, Bror F.; Doney, Scott C.; Dunne, John P.; Bender, Michael L. (John Wiley & Sons, 2013-04-02)The sea-air biological O2 flux assessed from measurements of surface O2 supersaturation in excess of Ar supersaturation (“O2 bioflux”) is increasingly being used to constrain net community production (NCP) in the upper ...