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Wind work on the geostrophic ocean circulation: An observational study of the effect of small scales in the wind stress

By C. W. Hughes and C Wilson

Abstract

We use QuikSCAT scatterometer data, together with geostrophic surface currents calculated from a combination of satellite altimetry, gravity and drifter data, to investigate the rate of work done on the geostrophic circulation by wind stress. In particular, we test the suggestion that accounting for ocean currents in the calculation of stress from 10 m winds can result in a reduction of 20–35% in the wind work, compared with an\ud approximate calculation in which currents are not accounted for. We calculate the predicted effect of accounting for ocean currents to be a reduction in power of about 0.19 TW, and find a total power input from observations which include this effect to be 0.76 TW, smaller than earlier estimates by about the right amount. By recalculating the power input using smoothed wind stresses or currents, we demonstrate that the effect of\ud ocean currents is visible in the midlatitude data, and close to the predicted value. Proof that the data are adequate to resolve the effect in the tropics, however, is lacking, suggesting that additional processes may also be important in this region

Topics: Marine Sciences
Year: 2008
DOI identifier: 10.1029/2007JC004371
OAI identifier: oai:nora.nerc.ac.uk:5013

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Citations

  1. (2003). A Comparison of two 85 GHz SSM/I ice concentration algorithms with AVHRR and ERS-SAR, doi
  2. (2003). A predator’s perspective on causal links between climate change, physical forcing and ecosystem response,
  3. (2000). A search for ENSO teleconnections in the west Antarctic Peninsula climate in austral winter,
  4. (2008). An analysis of the atmospheric processes driving the large-scale winter sea ice variability in the Southern Ocean, doi
  5. (2006). Atmospheric circulation impacts on winter maximum sea ice extent in the west Antarctic Peninsula region (1979–2001),
  6. (1997). Atmospheric meridional circulation impacts on contrasting winter sea ice extent in two years in the Pacific sector of the Southern Ocean,
  7. (2005). Bootstrap sea ice concentrations for
  8. (1998). Climate change in the western Antarctic Peninsula since 1945: Observations and possible causes,
  9. Comiso (2002a), Spatial patterns of variability in Antarctic surface temperature: Connections to the Southern Hemisphere Annular Mode and the Southern Oscillation, doi
  10. Comiso (2002b), Southern Ocean climate and sea ice anomalies associated with the Southern Oscillation, doi
  11. Connolley (2006), The role of atmospheric circulation in the record minimum extent of open water in the Ross Sea in the 2003 austral summer,
  12. (2006). Decadal variability of the ENSO teleconnection to the high latitude South Pacific governed by coupling with the Southern Annular Mode,
  13. (1997). Effects of sea-ice extent and salp or krill dominance on the Antarctic food web,
  14. (1995). Effects of the snow cover on Antarctic sea ice and potential modulation of its response to climate change,
  15. (2006). Extreme anomalous atmospheric circulation in the West Antarctic Peninsula region in austral spring and summer 2001/2, and its profound impact on sea ice and biota,
  16. Harangozo (2000), An appraisal of NCEP/NCAR reanalysis MSLP data viability for climate studies in the South Pacific,
  17. (1986). Ice edges and seabird occurrence in
  18. (1999). Importance of ice-ocean interactions for the global ocean circulation: a model study,
  19. (2004). Influence of the Southern Annular Mode on the sea ice-ocean system, doi
  20. (1998). Interannual and intraseasonal variability in the Southern Hemisphere,
  21. (1998). Interannual variability in summer sea ice minimum, coastal polynyas and bottom water formation in the Weddell Sea,
  22. (2004). Interpretation of recent Antarctic sea ice variability,
  23. (2003). Large-scale characteristics and variability of the global sea ice cover, in Sea Ice—An Introduction to its Physics, Biology, Chemistry and Geology,
  24. (2006). Observed relationships between the El Nin˜o/Southern Oscillation and the extra-tropical zonalmean circulation,
  25. (1999). ocean general circulation model reference manual,
  26. (2005). Opposite phases of the Antarctic Oscillation and relationships with intraseasonal to interannual activity in the Tropics during austral summer,
  27. (2003). Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors,
  28. Remote Sens., doi
  29. (1995). Satellite remote sensing of ice motion, in Oceanographic Applications of Remote Sensing,
  30. (2003). Sea ice: A critical habitat for polar marine mammals and birds, in Sea Ice—An Introduction to its Physics, Biology, Chemistry and Geology,
  31. (1981). Seabird affinities for ocean and ice boundaries in the Antarctic,
  32. (1997). Sensitivity of a global sea ice model to the treatment of ice thermodynamics and dynamics,
  33. (1989). Southern Hemisphere circulation features associated with El Nin˜o–Southern Oscillation events, doi
  34. (1995). SSM/I concentrations using the Bootstrap algorithm,
  35. (2002). Synchronous variability in the Southern Hemisphere atmosphere, sea ice, and ocean resulting from the Annular Mode,
  36. (2006). Teleconnections between the tropical Pacific and the Amundsen-Bellingshausen Sea: doi
  37. (2004). The distribution of seabirds and pinnepeds in Marguerite Bay and their relationship to physical features during austral winter
  38. (2004). The impact of winter ice retreat on Antarctic winter sea ice extent and links to atmospheric meridional circulation,
  39. (1998). The percolation phase transition in sea ice,
  40. (2004). The relationship of Pacific deep tropical convection to the winter and springtime extratropical atmospheric circulation of the South Pacific in El Nin˜o events,
  41. (1999). The storm tracks and energy cycle of the Southern Hemisphere: Sensitivity to sea-ice boundary conditions,
  42. (1986). The surface heat and mass balance, in The Geophysics of Sea Ice,
  43. (2003). Trends in the Southern Annular Mode from observations and reanalyses,
  44. (1992). Trivelpiece

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