Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10° Ocean Model
Abstract
The relationship between the southern annular mode (SAM) and Southern Ocean mixed layer depth (MLD) is investigated herein using a global 0.1° resolution ocean model. The SAM index is defined as the principal component time series of the leading empirical orthogonal function of extratropical sea level pressure from September to December, when the zonally symmetric SAM feature is most prominent. Following positive phases of the SAM, anomalous deep mixed layers occur in the subsequent fall season, starting in May, particularly in the southeast Pacific. Composite analyses reveal that for positive SAM phases enhanced surface cooling caused by anomalously strong westerlies weakens the stratification of the water column, leading to deeper mixed layers during spring when the SAM signal is at its strongest. During the subsequent summer, the surface warms and the mixed layer shoals. However, beneath the warm surface layer, anomalously weak stratification persists throughout the summer and into fall. When the surface cools again during fall, the mixed layer readily deepens due to this weak interior stratification, a legacy from the previous springtime conditions. Therefore, the spring SAM–fall MLD relationship is interpreted here as a manifestation of reemergence of interior water mass anomalies. The opposite occurs after negative phasesmore »
- Authors:
-
[1];
- Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, State College, Pennsylvania, and Climate Change Research Centre and ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales, Australia
- Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, State College, Pennsylvania
- Climate Change Research Centre and ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, New South Wales, Australia
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); AustralianResearch Council (ARC)
- OSTI Identifier:
- 1558709
- Alternate Identifier(s):
- OSTI ID: 1612198
- Grant/Contract Number:
- SC0014440; AGS-1455577; TG-OCE110013; OCE-0850463
- Resource Type:
- Published Article
- Journal Name:
- Journal of Climate
- Additional Journal Information:
- Journal Name: Journal of Climate Journal Volume: 32 Journal Issue: 18; Journal ID: ISSN 0894-8755
- Publisher:
- American Meteorological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Meteorology & atmospheric sciences; Southern Ocean; Atmosphere-ocean interaction; Mixed layer; Climate variability; General circulation models; Interannual variability
Citation Formats
Li, Qian, Lee, Sukyoung, England, Matthew H., and McClean, Julie L. Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10° Ocean Model. United States: N. p., 2019.
Web. doi:10.1175/JCLI-D-19-0159.1.
Li, Qian, Lee, Sukyoung, England, Matthew H., & McClean, Julie L. Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10° Ocean Model. United States. https://doi.org/10.1175/JCLI-D-19-0159.1
Li, Qian, Lee, Sukyoung, England, Matthew H., and McClean, Julie L. Fri .
"Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10° Ocean Model". United States. https://doi.org/10.1175/JCLI-D-19-0159.1.
@article{osti_1558709,
title = {Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10° Ocean Model},
author = {Li, Qian and Lee, Sukyoung and England, Matthew H. and McClean, Julie L.},
abstractNote = {The relationship between the southern annular mode (SAM) and Southern Ocean mixed layer depth (MLD) is investigated herein using a global 0.1° resolution ocean model. The SAM index is defined as the principal component time series of the leading empirical orthogonal function of extratropical sea level pressure from September to December, when the zonally symmetric SAM feature is most prominent. Following positive phases of the SAM, anomalous deep mixed layers occur in the subsequent fall season, starting in May, particularly in the southeast Pacific. Composite analyses reveal that for positive SAM phases enhanced surface cooling caused by anomalously strong westerlies weakens the stratification of the water column, leading to deeper mixed layers during spring when the SAM signal is at its strongest. During the subsequent summer, the surface warms and the mixed layer shoals. However, beneath the warm surface layer, anomalously weak stratification persists throughout the summer and into fall. When the surface cools again during fall, the mixed layer readily deepens due to this weak interior stratification, a legacy from the previous springtime conditions. Therefore, the spring SAM–fall MLD relationship is interpreted here as a manifestation of reemergence of interior water mass anomalies. The opposite occurs after negative phases of the SAM, with anomalously shallow mixed layers resulting. Additional analyses reveal that for the MLD region in the southeast Pacific, the effects of salinity variations and Ekman heat advection are negligible, although Ekman heat transport may play an important role in other regions where mode water is formed, such as south of Australia and in the Indian Ocean.},
doi = {10.1175/JCLI-D-19-0159.1},
journal = {Journal of Climate},
number = 18,
volume = 32,
place = {United States},
year = {Fri Aug 23 00:00:00 EDT 2019},
month = {Fri Aug 23 00:00:00 EDT 2019}
}
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Works referenced in this record:
The role of air-sea fluxes in Subantarctic Mode Water formation: SAMW FORMATION
journal, March 2012
- Holte, James W.; Talley, Lynne D.; Chereskin, Teresa K.
- Journal of Geophysical Research: Oceans, Vol. 117, Issue C3
Observed Relationships between the El Niño–Southern Oscillation and the Extratropical Zonal-Mean Circulation
journal, January 2006
- L’Heureux, Michelle L.; Thompson, David W. J.
- Journal of Climate, Vol. 19, Issue 2
The Role of Eddies in the Southern Ocean Temperature Response to the Southern Annular Mode
journal, February 2009
- Screen, James A.; Gillett, Nathan P.; Stevens, David P.
- Journal of Climate, Vol. 22, Issue 3
The global climatology of an interannually varying air–sea flux data set
journal, August 2008
- Large, W. G.; Yeager, S. G.
- Climate Dynamics, Vol. 33, Issue 2-3
Zonally asymmetric response of the Southern Ocean mixed-layer depth to the Southern Annular Mode
journal, March 2010
- Sallée, J. B.; Speer, K. G.; Rintoul, S. R.
- Nature Geoscience, Vol. 3, Issue 4
Southern Ocean mixed-layer depth from Argo float profiles
journal, January 2008
- Dong, Shenfu; Sprintall, Janet; Gille, Sarah T.
- Journal of Geophysical Research, Vol. 113, Issue C6
Wave-Driven Zonal Flow Vacillation in the Southern Hemisphere
journal, April 1998
- Hartmann, Dennis L.; Lo, Fiona
- Journal of the Atmospheric Sciences, Vol. 55, Issue 8
Simulation of Recent Southern Hemisphere Climate Change
journal, October 2003
- Gillett, N. P.
- Science, Vol. 302, Issue 5643
Antarctic Intermediate Water and Subantarctic Mode Water Formation in the Southeast Pacific: The Role of Turbulent Mixing
journal, July 2010
- Sloyan, Bernadette M.; Talley, Lynne D.; Chereskin, Teresa K.
- Journal of Physical Oceanography, Vol. 40, Issue 7
How does Subantarctic Mode Water ventilate the Southern Hemisphere subtropics?: MODE WATER EXPORT
journal, September 2016
- Jones, Daniel C.; Meijers, Andrew J. S.; Shuckburgh, Emily
- Journal of Geophysical Research: Oceans, Vol. 121, Issue 9
Boundary impulse response functions in a century-long eddying global ocean simulation
journal, October 2009
- Maltrud, Mathew; Bryan, Frank; Peacock, Synte
- Environmental Fluid Mechanics, Vol. 10, Issue 1-2
Attribution of observed sea level pressure trends to greenhouse gas, aerosol, and ozone changes: ATTRIBUTION OF SEA LEVEL PRESSURE TRENDS
journal, May 2013
- Gillett, Nathan P.; Fyfe, John C.; Parker, David E.
- Geophysical Research Letters, Vol. 40, Issue 10
Southern Hemisphere Annular Mode Variability and the Role of Optimal Nonmodal Growth
journal, June 2005
- Rashid, Harun A.; Simmonds, Ian
- Journal of the Atmospheric Sciences, Vol. 62, Issue 6
Processes that influence sea surface temperature and ocean mixed layer depth variability in a coupled model
journal, July 2000
- Alexander, Michael A.; Scott, James D.; Deser, Clara
- Journal of Geophysical Research: Oceans, Vol. 105, Issue C7
Formation of subantarctic mode water in the southeastern Indian Ocean
journal, February 2006
- Sallée, Jean-Baptiste; Wienders, Nicolas; Speer, Kevin
- Ocean Dynamics, Vol. 56, Issue 5-6
Parallel ocean general circulation modeling
journal, November 1992
- Smith, R. D.; Dukowicz, J. K.; Malone, R. C.
- Physica D: Nonlinear Phenomena, Vol. 60, Issue 1-4
Coupled Ocean–Atmosphere–Ice Response to Variations in the Southern Annular Mode
journal, September 2006
- Sen Gupta, Alexander; England, Matthew H.
- Journal of Climate, Vol. 19, Issue 18
Isopycnal Eddy Diffusivities and Critical Layers in the Kuroshio Extension from an Eddying Ocean Model
journal, August 2014
- Chen, Ru; McClean, Julie L.; Gille, Sarah T.
- Journal of Physical Oceanography, Vol. 44, Issue 8
Observations of Large-Scale Ocean–Atmosphere Interaction in the Southern Hemisphere
journal, March 2008
- Ciasto, Laura M.; Thompson, David W. J.
- Journal of Climate, Vol. 21, Issue 6
Stratospheric variability and tropospheric annular-mode timescales: STRAT VARIABILITY AND TROP TIMESCALES
journal, October 2011
- Simpson, I. R.; Hitchcock, P.; Shepherd, T. G.
- Geophysical Research Letters, Vol. 38, Issue 20
Accurate and Computationally Efficient Algorithms for Potential Temperature and Density of Seawater
journal, May 2003
- McDougall, Trevor J.; Jackett, David R.; Wright, Daniel G.
- Journal of Atmospheric and Oceanic Technology, Vol. 20, Issue 5
High-latitude controls of thermocline nutrients and low latitude biological productivity
journal, January 2004
- Sarmiento, J. L.; Gruber, N.; Brzezinski, M. A.
- Nature, Vol. 427, Issue 6969
The Role of Poleward-Intensifying Winds on Southern Ocean Warming
journal, November 2007
- Fyfe, John C.; Saenko, Oleg A.; Zickfeld, Kirsten
- Journal of Climate, Vol. 20, Issue 21
Annular Modes in the Extratropical Circulation. Part I: Month-to-Month Variability*
journal, March 2000
- Thompson, David W. J.; Wallace, John M.
- Journal of Climate, Vol. 13, Issue 5
Southern Hemisphere Atmospheric Circulation Response to Global Warming
journal, May 2001
- Kushner, Paul J.; Held, Isaac M.; Delworth, Thomas L.
- Journal of Climate, Vol. 14, Issue 10
An Argo mixed layer climatology and database: ARGO MLD CLIMATOLOGY
journal, June 2017
- Holte, James; Talley, Lynne D.; Gilson, John
- Geophysical Research Letters, Vol. 44, Issue 11
Ocean and Atmosphere Storm Tracks: The Role of Eddy Vorticity Forcing
journal, September 2007
- Williams, Richard G.; Wilson, Chris; Hughes, Chris W.
- Journal of Physical Oceanography, Vol. 37, Issue 9
Seasonal Predictability of the Southern Annular Mode due to Its Association with ENSO
journal, October 2013
- Lim, Eun-Pa; Hendon, Harry H.; Rashid, Harun
- Journal of Climate, Vol. 26, Issue 20
Response of the Southern Ocean to the Southern Annular Mode: Interannual Variability and Multidecadal Trend
journal, July 2010
- Treguier, A. M.; Le Sommer, J.; Molines, J. M.
- Journal of Physical Oceanography, Vol. 40, Issue 7
Nutrient variability in Subantarctic Mode Waters forced by the Southern Annular Mode and ENSO: SUBANTARCTIC MODE WATER NUTRIENTS
journal, July 2013
- Ayers, Jennifer M.; Strutton, Peter G.
- Geophysical Research Letters, Vol. 40, Issue 13
Eddy–Zonal Flow Feedback in the Southern Hemisphere
journal, November 2001
- Lorenz, David J.; Hartmann, Dennis L.
- Journal of the Atmospheric Sciences, Vol. 58, Issue 21
Diathermal Heat Transport in a Global Ocean Model
journal, January 2019
- Holmes, Ryan M.; Zika, Jan D.; England, Matthew H.
- Journal of Physical Oceanography, Vol. 49, Issue 1
Sensitivity to Surface Forcing and Boundary Layer Mixing in a Global Ocean Model: Annual-Mean Climatology
journal, November 1997
- Large, William G.; Danabasoglu, Gokhan; Doney, Scott C.
- Journal of Physical Oceanography, Vol. 27, Issue 11
The Oceanic Sink for Anthropogenic CO2
journal, July 2004
- Sabine, C. L.
- Science, Vol. 305, Issue 5682
Dominance of the Southern Ocean in Anthropogenic Carbon and Heat Uptake in CMIP5 Models
journal, January 2015
- Frölicher, Thomas L.; Sarmiento, Jorge L.; Paynter, David J.
- Journal of Climate, Vol. 28, Issue 2
Compensation of Horizontal Temperature and Salinity Gradients in the Ocean Mixed Layer
journal, January 1999
- Rudnick, D. L.
- Science, Vol. 283, Issue 5401
Interpretation of Recent Southern Hemisphere Climate Change
journal, May 2002
- Thompson, D. W. J.
- Science, Vol. 296, Issue 5569
Seasonal mixed-layer dynamics in an eddy-resolving ocean circulation model: Mixed-Layer Dynamics
journal, July 2013
- Schiller, Andreas; Ridgway, Ken R.
- Journal of Geophysical Research: Oceans, Vol. 118, Issue 7
Mechanisms of Hemispherically Symmetric Climate Variability*
journal, September 2003
- Seager, Richard; Harnik, Nili; Kushnir, Yochanan
- Journal of Climate, Vol. 16, Issue 18
Eddies and the annular modes of climate variability
journal, October 1999
- Limpasuvan, Varavut; Hartmann, Dennis L.
- Geophysical Research Letters, Vol. 26, Issue 20
Subantarctic Mode Water Formation, Destruction, and Export in the Eddy-Permitting Southern Ocean State Estimate
journal, July 2013
- Cerovečki, Ivana; Talley, Lynne D.; Mazloff, Matthew R.
- Journal of Physical Oceanography, Vol. 43, Issue 7
The Impact of ENSO on Wave Breaking and Southern Annular Mode Events
journal, September 2010
- Gong, Tingting; Feldstein, Steven B.; Luo, Dehai
- Journal of the Atmospheric Sciences, Vol. 67, Issue 9
Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology
journal, January 2004
- de Boyer Montégut, Clément
- Journal of Geophysical Research, Vol. 109, Issue C12
The Southern Hemisphere Westerlies in a Warming World: Propping Open the Door to the Deep Ocean
journal, December 2006
- Russell, Joellen L.; Dixon, Keith W.; Gnanadesikan, Anand
- Journal of Climate, Vol. 19, Issue 24
Effects of Eddy Vorticity Forcing on the Mean State of the Kuroshio Extension
journal, May 2015
- Delman, Andrew S.; McClean, Julie L.; Sprintall, Janet
- Journal of Physical Oceanography, Vol. 45, Issue 5
Synchronous Variability in the Southern Hemisphere Atmosphere, Sea Ice, and Ocean Resulting from the Annular Mode*
journal, November 2002
- Hall, Alex; Visbeck, Martin
- Journal of Climate, Vol. 15, Issue 21
Trends in the Southern Annular Mode from Observations and Reanalyses
journal, December 2003
- Marshall, Gareth J.
- Journal of Climate, Vol. 16, Issue 24
Tropical Pacific SST Drivers of Recent Antarctic Sea Ice Trends
journal, December 2016
- Purich, Ariaan; England, Matthew H.; Cai, Wenju
- Journal of Climate, Vol. 29, Issue 24
A Mechanism of Mixed Layer Formation in the Indo–Western Pacific Southern Ocean: Preconditioning by an Eddy-Driven Jet-Scale Overturning Circulation
journal, November 2017
- Li, Qian; Lee, Sukyoung
- Journal of Physical Oceanography, Vol. 47, Issue 11
Annular modes and apparent eddy feedbacks in the Southern Hemisphere: ANNULAR MODES, EDDY FEEDBACKS
journal, April 2016
- Byrne, Nicholas J.; Shepherd, Theodore G.; Woollings, Tim
- Geophysical Research Letters, Vol. 43, Issue 8
Trends in Southern Hemisphere Circulation in IPCC AR4 Models over 1950–99: Ozone Depletion versus Greenhouse Forcing
journal, February 2007
- Cai, Wenju; Cowan, Tim
- Journal of Climate, Vol. 20, Issue 4
Observed ENSO teleconnections to Southern Ocean SST anomalies diagnosed from a surface mixed layer heat budget
journal, May 2011
- Ciasto, Laura M.; England, Matthew H.
- Geophysical Research Letters, Vol. 38, Issue 9
Unabated planetary warming and its ocean structure since 2006
journal, February 2015
- Roemmich, Dean; Church, John; Gilson, John
- Nature Climate Change, Vol. 5, Issue 3
Impacts of wind stress on the Antarctic Circumpolar Current fronts and associated subduction: ACC FRONTS AND SUBDUCTION
journal, June 2011
- Downes, S. M.; Budnick, A. S.; Sarmiento, J. L.
- Geophysical Research Letters, Vol. 38, Issue 11
Definition of Antarctic Oscillation index
journal, February 1999
- Gong, Daoyi; Wang, Shaowu
- Geophysical Research Letters, Vol. 26, Issue 4
Contributions of External Forcings to Southern Annular Mode Trends
journal, June 2006
- Arblaster, Julie M.; Meehl, Gerald A.
- Journal of Climate, Vol. 19, Issue 12
The Early 1990s Change in ENSO–PSA–SAM Relationships and Its Impact on Southern Hemisphere Climate
journal, December 2015
- Yu, Jin-Yi; Paek, Houk; Saltzman, Eric S.
- Journal of Climate, Vol. 28, Issue 23
Southern Ocean Seasonal Restratification Delayed by Submesoscale Wind–Front Interactions
journal, April 2019
- du Plessis, Marcel; Swart, Sebastiaan; Ansorge, Isabelle J.
- Journal of Physical Oceanography, Vol. 49, Issue 4
Principal Modes of Southern Hemisphere Low-Frequency Variability Obtained from NCEP–NCAR Reanalyses
journal, September 1999
- Kidson, John W.
- Journal of Climate, Vol. 12, Issue 9
Role of the Southern Annular Mode (SAM) in Southern Ocean CO 2 uptake : SAM AND SOUTHERN OCEAN CO
journal, May 2007
- Lenton, Andrew; Matear, Richard J.
- Global Biogeochemical Cycles, Vol. 21, Issue 2
Subduction over the Southern Indian Ocean in a High-Resolution Atmosphere–Ocean Coupled Model
journal, August 2011
- Lee, Mei-Man; Nurser, A. J. George; Stevens, I.
- Journal of Climate, Vol. 24, Issue 15
The Antarctic Circumpolar Wave: A Combination of Two Signals?
journal, August 2003
- Venegas, Silvia A.
- Journal of Climate, Vol. 16, Issue 15
Forcing of the Antarctic Circumpolar Wave by El Niño-Southern Oscillation teleconnections
journal, May 2001
- Cai, Wenju; Baines, Peter G.
- Journal of Geophysical Research: Oceans, Vol. 106, Issue C5
Ekman Transport Dominates Local Air–Sea Fluxes in Driving Variability of Subantarctic Mode Water
journal, May 2002
- Rintoul, Stephen R.; England, Matthew H.
- Journal of Physical Oceanography, Vol. 32, Issue 5
Dynamics of sea-surface temperature anomalies in the Southern Ocean diagnosed from a 2D mixed-layer model
journal, December 2009
- Vivier, Frédéric; Iudicone, Daniele; Busdraghi, Fabiano
- Climate Dynamics, Vol. 34, Issue 2-3
An Antarctic Circumpolar Current driven by surface buoyancy forcing: BUOYANCY FORCING OF THE ACC
journal, December 2010
- Hogg, Andrew McC.
- Geophysical Research Letters, Vol. 37, Issue 23
Localized subduction of anthropogenic carbon dioxide in the Southern Hemisphere oceans
journal, July 2012
- Sallée, Jean-Baptiste; Matear, Richard J.; Rintoul, Stephen R.
- Nature Geoscience, Vol. 5, Issue 8