Transient response of the southern ocean to idealized wind and thermal forcing across different model resolutions
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Li, Qian; England, Matthew Heathcote; Hogg, Andy
Description
The Southern Ocean has undergone significant climate-related changes over recent decades, including intensified westerly winds and increased radiative heating. The interplay between wind-driven cooling and radiative warming of the ocean is complex and remains unresolved. In this study, idealized wind and thermal perturbations are analyzed in a global ocean-sea ice model at two horizontal resolutions: nominally, 18 and 0.18. The sea surface temperature (SST) response shows a clear transition...[Show more]
dc.contributor.author | Li, Qian | |
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dc.contributor.author | England, Matthew Heathcote | |
dc.contributor.author | Hogg, Andy | |
dc.date.accessioned | 2023-06-29T01:56:06Z | |
dc.identifier.issn | 0894-8755 | |
dc.identifier.uri | http://hdl.handle.net/1885/293786 | |
dc.description.abstract | The Southern Ocean has undergone significant climate-related changes over recent decades, including intensified westerly winds and increased radiative heating. The interplay between wind-driven cooling and radiative warming of the ocean is complex and remains unresolved. In this study, idealized wind and thermal perturbations are analyzed in a global ocean-sea ice model at two horizontal resolutions: nominally, 18 and 0.18. The sea surface temperature (SST) response shows a clear transition from a wind-driven cooling phase to a warming phase. This warming transition is largely attributed to meridional and vertical Ekman heat advection, which are both sensitive to model resolution due to the model-dependent components of temperature gradients. At higher model resolution, due to a more accurate representation of near-surface vertical temperature inversion and upward Ekman heat advection around Antarctica, the anomalous SST warming is stronger and develops earlier. The mixed layer depth at midlatitudes initially increases due to a wind-driven increase in Ekman transport of cold dense surface water northward, but then decreases when the thermal forcing drives enhanced surface stratification; both responses are more sensitive at lower model resolution. With the wind intensification, the residual overturning circulation increases less in the 0.1° case because of the adequately resolved eddy compensation. Ocean heat subduction penetrates along more tilted isopycnals in the 18 case, but it orients to follow isopycnal layers in the 0.1° case. These findings have implications for understanding the ocean response to the combined effects of Southern Hemisphere westerly wind changes and anthropogenic warming. | |
dc.description.sponsorship | QL is supported by the Australian Research Council (ARC) Centre of Excellence for Climate System Science. MHE is supported by the ARC Centre of Excellence for Climate Extremes and the Centre for Southern Hemisphere Ocean Research (CSHOR), a joint research center between QNLM, CSIRO, UNSW, and UTAS. MHE is also supported by the Earth Science and Climate Change Hub of the Australian Government’s National Environmental Science Programme (NESP). The model simulations and analysis were conducted on the National Computational Infrastructure (NCI) facility in Canberra, Australia. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | American Meteorological Society | |
dc.rights | © 2021 American Meteorological Society. | |
dc.source | Journal of Climate | |
dc.title | Transient response of the southern ocean to idealized wind and thermal forcing across different model resolutions | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 34 | |
dc.date.issued | 2021 | |
local.identifier.absfor | 370803 - Physical oceanography | |
local.identifier.ariespublication | a383154xPUB19693 | |
local.publisher.url | https://journals.ametsoc.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Li, Qian, University of New South Wales | |
local.contributor.affiliation | England, Matthew Heathcote, University of New South Wales | |
local.contributor.affiliation | Hogg, Andy, College of Science, ANU | |
local.bibliographicCitation.issue | 13 | |
local.bibliographicCitation.startpage | 5477 | |
local.bibliographicCitation.lastpage | 5496 | |
local.identifier.doi | 10.1175/JCLI-D-20-0981.1 | |
local.identifier.absseo | 190501 - Climate change models | |
dc.date.updated | 2022-04-10T08:18:21Z | |
local.identifier.scopusID | 2-s2.0-85106930428 | |
dcterms.accessRights | Open Access | |
dc.provenance | https://v2.sherpa.ac.uk/id/publication/9932..."The Published Version can be archived in an Institutional Repository" from SHERPA/RoMEO site (as at 11/07/2023). | |
Collections | ANU Research Publications |
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1520-0442-JCLI-D-20-0981.1.pdf | 8.5 MB | Adobe PDF |
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