Monitoring and understanding Southern Ocean variability and its impact on climate: a strategy for sustained observations

The Southern Ocean profoundly influences regional and global climate. Several unique features of the Southern Ocean contribute to this climate influence: the zonally unbounded nature of the circumpolar ocean; the fact that deep and intermediate layers in the ocean interior are exposed to direct atmospheric forcing there; and the presence of a vast extent of seasonally-varying sea ice. The Southern Ocean is also remote, and the environment is hostile. As a consequence, historical data is scarce and hypotheses regarding the climate impact of Southern Ocean processes have been difficult to formulate and test. For these reasons, design and implementation of an observing system for the Southern Ocean is a formidable challenge. However, recent advances in understanding and instrumentation mean that it is now feasible to obtain the sustained observations needed to describe and understand the Southern Ocean processes responsible for climate variability.

[1]  Y. Kerr,et al.  Observing the Ocean from Space: Emerging Capabilities in Europe , 2001 .

[2]  S. Jacobs,et al.  Cooling and ventilating the Abyssal Ocean , 2001 .

[3]  Eberhard Fahrbach,et al.  Sea ice transports in the Weddell Sea , 2001 .

[4]  S. Rintoul,et al.  Circulation, Renewal, and Modification of Antarctic Mode and Intermediate Water , 2001 .

[5]  S. Sokolov,et al.  Baroclinic transport variability of the Antarctic Circumpolar Current south of Australia (WOCE repeat section SR3) , 2001 .

[6]  E. Fahrbach,et al.  Flow of bottom water in the northwestern Weddell Sea , 2001 .

[7]  Frank O. Bryan,et al.  What sets the mean transport through Drake Passage , 2001 .

[8]  D. Watts,et al.  A circumpolar gravest empirical mode for the Southern Ocean hydrography , 2001 .

[9]  K. Speer,et al.  The Diabatic Deacon Cell , 2000 .

[10]  I. Smith,et al.  Southwest Western Australian winter rainfall and its association with Indian Ocean climate variability , 2000 .

[11]  K. Mo,et al.  Relationships between Low-Frequency Variability in the Southern Hemisphere and Sea Surface Temperature Anomalies , 2000 .

[12]  J. Gregory,et al.  Are observed decadal changes in intermediate water masses a signature of anthropogenic climate change? , 2000 .

[13]  I. Smith,et al.  Evidence for decadal variability in southern Australian rainfall and relationships with regional pressure and sea surface temperature , 2000 .

[14]  W. White.  Influence of the Antarctic Circumpolar Wave on Australian Precipitation from 1958 to 1997 , 2000 .

[15]  N. Bindoff,et al.  Decadal Changes along an Indian Ocean Section at 32°S and Their Interpretation , 2000 .

[16]  G. Vallis.  Large-Scale Circulation and Production of Stratification: Effects of Wind, Geometry, and Diffusion , 2000 .

[17]  M. Mcphaden,et al.  Interior pycnocline flow from the subtropical to the Equatorial Pacific Ocean , 1999 .

[18]  R. Samelson.  Geostrophic Circulation in a Rectangular Basin with a Circumpolar Connection , 1999 .

[19]  T. Peng,et al.  A possible 20th-century slowdown of southern ocean deep water formation , 1999, Science.

[20]  N. Bindoff,et al.  Large-scale freshening of intermediate waters in the Pacific and Indian oceans , 1999, Nature.

[21]  D. Battisti,et al.  Interannual (ENSO) and Interdecadal (ENSO-like) Variability in the Southern Hemisphere Tropospheric Circulation* , 1999 .

[22]  A. Hirst,et al.  Climate change feedback on the future oceanic CO2 uptake , 1999 .

[23]  A. Sterl,et al.  Interannual variability in the Southern Ocean from an ocean model forced by European Centre for Medium‐Range Weather Forecasts reanalysis fluxes , 1999 .

[24]  A. Sterl,et al.  Stochastically forced variability in the Antarctic Circumpolar Current , 1999 .

[25]  B. Huang,et al.  Pacific subtropical‐tropical thermocline water exchange in the National Centers for Environmental Prediction ocean model , 1999 .

[26]  T. Barnett,et al.  Pacific thermocline bridge revisited , 1999 .

[27]  A. Gnanadesikan,et al.  A simple predictive model for the structure of the oceanic pycnocline , 1999, Science.

[28]  A. Weaver.  Extratropical subduction and decadal modulation of El Niño , 1999 .

[29]  A. Gnanadesikan.  A global model of silicon cycling: Sensitivity to eddy parameterization and dissolution , 1999 .

[30]  J. Marshall,et al.  A Model of Decadal Middle-Latitude Atmosphere–Ocean Coupled Modes , 1999 .

[31]  P. Mayewski,et al.  Bi-polar ocean linkages: evidence from late-Holocene Antarctic marine and Greenland ice-core records , 1999 .

[32]  W. White,et al.  The Antarctic Circumpolar Wave: A Beta Effect in Ocean-Atmosphere Coupling over the Southern Ocean , 1998 .

[33]  P. Tréguer,et al.  KERFIX, a time series station in the Southern Ocean: a presentation , 1998 .

[34]  J. Fischer,et al.  Transports and Pathways of the Upper-Layer Circulation in the Western Tropical Atlantic , 1998 .

[35]  W. White,et al.  Quasi‐periodicity and global symmetries in interdecadal upper ocean temperature variability , 1998 .

[36]  J. Toggweiler,et al.  On the Ocean’s Large-Scale Circulation near the Limit of No Vertical Mixing , 1998 .

[37]  G. Meehl,et al.  A modulation of the mechanism of the semiannual oscillation in the Southern Hemisphere , 1998 .

[38]  T. Barnett,et al.  The Antarctic Circumpolar Wave in a Coupled Ocean-Atmosphere GCM , 1998 .

[39]  Kevin E. Trenberth,et al.  Progress during TOGA in understanding and modeling global teleconnections associated with tropical sea surface temperatures , 1998 .

[40]  Syukuro Manabe,et al.  Simulated response of the ocean carbon cycle to anthropogenic climate warming , 1998, Nature.

[41]  J. Moisan,et al.  The Seasonal Heat Budget of the North Pacific: Net Heat Flux and Heat Storage Rates (1950–1990) , 1998 .

[42]  R. Curry,et al.  Oceanic transport of subpolar climate signals to mid-depth subtropical waters , 1998, Nature.

[43]  I. Simmonds,et al.  Decadal and centennial variability of the southern semiannual oscillation simulated in the GFDL coupled GCM , 1997 .

[44]  T. Osborn.  Thermohaline Oscillations in the LSG OGCM: Propagating Anomalies and Sensitivity to Parameterizations , 1997 .

[45]  E. Cook,et al.  Sea-level pressure variability around Antarctica since A.D. 1750 inferred from subantarctic tree-ring records , 1997 .

[46]  W. Zenk,et al.  Long‐period changes in the bottom water flowing through Vema Channel , 1997 .

[47]  Anthony C. Hirst,et al.  Chlorofluorocarbon uptake in a world ocean model 2 , 1997 .

[48]  Bruno Blanke,et al.  Kinematics of the Pacific Equatorial Undercurrent: An Eulerian and Lagrangian Approach from GCM Results , 1997 .

[49]  Paul E. Robbins,et al.  The dissolved silica budget as a constraint on the meridional overturning circulation of the Indian Ocean , 1997 .

[50]  H. Hurlburt,et al.  The contribution of the global thermohaline circulation to the Pacific to Indian Ocean Throughflow via Indonesia , 1997 .

[51]  S. Philander,et al.  Interdecadal Climate Fluctuations That Depend on Exchanges Between the Tropics and Extratropics , 1997, Science.

[52]  G. Johnson,et al.  Southwest Pacific Ocean Water-Mass Changes between 1968/69 and 1990/91*† , 1997 .

[53]  A. Leventer,et al.  Productivity cycles of 200–300 years in the Antarctic Peninsula region: Understanding linkages among the sun, atmosphere, oceans, sea ice, and biota , 1996 .

[54]  William J. Schmitz,et al.  On the world ocean circulation. Volume II, the Pacific and Indian Oceans/a global update , 1996 .

[55]  Mojib Latif,et al.  Decadal climate variability over the North Pacific and North America: Dynamics and predictability , 1996 .

[56]  P. Jones,et al.  DECADAL VARIATIONS OF THE SOUTHERN HEMISPHERE CIRCULATION , 1996 .

[57]  D. Olson,et al.  Changes in Antarctic Bottom Water properties in the western , 1996 .

[58]  W. White,et al.  An Antarctic circumpolar wave in surface pressure, wind, temperature and sea-ice extent , 1996, Nature.

[59]  E. Maier‐Reimer,et al.  Mean Circulation and Internal Variability in an Ocean Primitive Equation Model , 1996 .

[60]  P. Lu,et al.  Influence of the ITCZ on the flow of thermocline water from the subtropical to the equatorial Pacific Ocean , 1995 .

[61]  Matthew H. England,et al.  Using chlorofluorocarbons to assess ocean climate models , 1995 .

[62]  David W. Pierce,et al.  Competing Roles of Heat and Freshwater Flux in Forcing Thermohaline Oscillations , 1995 .

[63]  C. Reason,et al.  Multidecadal Variability in the Climate System over the Indian Ocean Region during the Austral Summer. , 1995 .

[64]  W. Schmitz.  On the interbasin‐scale thermohaline circulation , 1995 .

[65]  David Rind,et al.  The role of sea ice in 2 x CO2 climate model sensitivity. Part 1: The total influence of sea ice thickness and extent , 1995 .

[66]  T. P. Barnett,et al.  Causes of Decadal Climate Variability over the North Pacific and North America , 1994, Science.

[67]  E. Fahrbach,et al.  Transport and structure of the Weddell Gyre , 1994 .

[68]  James W. Hurrell,et al.  A modulation of the atmospheric annual cycle in the Southern Hemisphere , 1994 .

[69]  J. Toggweiler,et al.  Instability of the thermohaline circulation with respect to mixed boundary conditions: is it really a problem for realistic models? , 1994 .

[70]  E. Fahrbach,et al.  Suppression of bottom water formation in the southeastern Weddell sea , 1994 .

[71]  Andrew J. Watson,et al.  Evidence for slow mixing across the pycnocline from an open-ocean tracer-release experiment , 1993, Nature.

[72]  M. Haylock,et al.  Circulation Features Associated with the Winter Rainfall Decrease in Southwestern Australia. , 1993 .

[73]  N. Bindoff,et al.  Warming of the water column in the southwest Pacific Ocean , 1992, Nature.

[74]  Neville Nicholls,et al.  Australian rainfall trends during the twentieth century , 1992 .

[75]  W. Broecker,et al.  The Peru Upwelling and the Ventilation of the South Pacific Thermocline , 1991 .

[76]  G. Meehl.  A Reexamination of the Mechanism of the Semiannual Oscillation in the Southern Hemisphere , 1991 .

[77]  S. Rintoul.  South Atlantic interbasin exchange , 1991 .

[78]  Uwe Mikolajewicz,et al.  Internal secular variability in an ocean general circulation model , 1990 .

[79]  A. Gordon,et al.  Southern ocean winter mixed layer , 1990 .

[80]  D. Martinson.  Evolution of the southern ocean winter mixed layer and sea ice: Open ocean deepwater formation and ventilation , 1990 .

[81]  M. Cox.  An Idealized Model of the World Ocean. Part I: The Global-Scale Water Masses , 1989 .

[82]  M. Tsuchiya.  Circulation of the Antarctic Intermediate Water in the North Atlantic Ocean , 1989 .

[83]  A. Carleton.  Antarctic sea-ice relationships with indices of the atmospheric circulation of the Southern Hemisphere , 1989 .

[84]  R. Peterson,et al.  Volume Transport of the Antarctic Circumpolar Current from Bottom Pressure Measurements , 1985 .

[85]  T. Whitworth.  Monitoring the Transport of the Antarctic Circumpolar Current at Drake Passage , 1983 .

[86]  Jeffery C. Rogers,et al.  Spatial Variability of Sea Level Pressure and 500 mb Height Anomalies over the Southern Hemisphere , 1982 .

[87]  A. E. Gill,et al.  Effects of geometry on the circulation of a three-dimensional southern-hemisphere ocean model , 1971 .

[88]  S. Rintoul,et al.  The Southern Ocean Limb of the Global Deep Overturning Circulation , 2001 .

[89]  Michele M. Rienecker,et al.  Operational oceanography and prediction – a GODAE perspective , 2001 .

[90]  E. F. Bradley,et al.  Surface fluxes and surface reference sites , 2001 .

[91]  Anthony C. Hirst,et al.  The Southern Ocean response to global warming in the CSIRO coupled ocean-atmosphere model , 1999, Environ. Model. Softw..

[92]  Dirk Olbers,et al.  The Antarctic Circumpolar Current System , 1999 .

[93]  Gregory C. Johnson,et al.  Circulation, mixing, and production of Antarctic Bottom Water , 1999 .

[94]  B. King.  ARGO: The Global Array of Profiling Floats , 1999 .

[95]  W. Large,et al.  GLOBAL OCEAN SURFACE VECTOR WIND OBSERVATIONS FROM SPACE ( , 1999 .

[96]  Ray F. Weiss,et al.  Ocean, Ice, and Atmosphere: Interactions at the Antarctic Continental Margin , 1998 .

[97]  P. Lu,et al.  Meridional Circulation Cells and the Source Waters of the Pacific Equatorial Undercurrent , 1998 .

[98]  R. Glowienka-Hense.  GCM response to an Antarctic polynya , 1995 .

[99]  Syukuro Manabe,et al.  Multiple-Century Response of a Coupled Ocean-Atmosphere Model to an Increase of Atmospheric Carbon Dioxide , 1994 .

[100]  E. Fahrbach,et al.  Circulation and water masses in the Weddell Sea , 1994 .

[101]  D. Martinson.  OCEAN HEAT AND SEASONAL SEA ICE THICKNESS IN THE SOUTHERN OCEAN , 1993 .

[102]  A. Gordon.  Two Stable Modes of Southern Ocean Winter Stratification , 1991 .

[103]  H. Loon.  Wind in the Southern Hemisphere , 1972 .

[104]  H. Stommel,et al.  On the abyssal circulation of the world ocean—I. Stationary planetary flow patterns on a sphere , 1959 .