Sensitivity of the Southern Ocean overturning circulation to surface buoyancy forcing
Open accessAbstract
The sensitivity of the Southern Ocean overturning to altered surface buoyancy forcing is investigated in a series of eddy-permitting, idealised simulations. The modelled response indicates that heat and freshwater fluxes in the Southern Hemisphere mid-latitudes may play a significant role in setting the strength of the overturning circulation. Enhanced buoyancy fluxes act to increase the meridional overturning up to a limit approaching the wind-driven Ekman transport. The sensitivity of the overturning to surface buoyancy forcing is strongly dependent on the relative locations of the wind stress profile, buoyancy forcing and upwelling region. The numerical simulations provide support for the hypothesis that changes in upwelling during deglaciations may have been driven by changes in heat and freshwater fluxes, instead of, or in addition to, changes in wind stress.
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Eddy effects generally oppose the Ekman circulation, resulting in eddy cancellation, a process well studied in the Southern Ocean.
“Eddy effects generally oppose the Ekman circulation, resulting in so-called ''eddy cancellation,'' a process well studied in the Southern Ocean.”
From Competition between Baroclinic Instability and Ekman Transport under Varying Buoyancy Forcings in Upwelling Systems: An Idealized Analog to the Southern Ocean (2021) · cites this paper as Morrison et al. 2011
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References 18 · Cited by 55
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- Authors
- Morrison, A. K., Hogg, A. M., & Ward, M. L.
- Affiliations
- Australian National University (AU)
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2011-07
- Volume
- 38
- Issue
- 14
- Pages
- n/a-n/a
- ISSN
- 0094-8276 (ISSN-L)
- OpenAlex
- W1601714826
- Cited by
- 55
- References
- 18
- Citations by year
- 2025: 4 · 2024: 1 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 5 · 2019: 5 · 2018: 2 · 2016: 8 · 2015: 7 · 2014: 4 · 2013: 2 · 2012: 5
- FWCI
- 2.72
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- Geophysical Research Letters (publishedVersion)
- ANU Open Research (Australian National University) (submittedVersion)
- Funders
- National Computational Infrastructure
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
- Keywords
- Southern Ocean overturning circulation, surface buoyancy forcing, heat flux, freshwater flux, meridional overturning circulation, upwelling, deglaciation
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