Journal of Oceanography

, Volume 64, Issue 4, pp 631–637 | Cite as

Ocean-atmosphere momentum coupling in the Kuroshio Extension observed from space

Original Articles


Using a combination of Quick Scatterometer (QuikSCAT), Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E), and Lagrangian drifter measurements, we demonstrate that wind data alone are not sufficient to derive ocean surface stress (momentum flux) over mid-latitude ocean fronts, specifically the Kuroshio Extension. There was no continuous and large-scale stress measurement over ocean until the launch of the scatterometers. Stress had been derived from winds through a drag coefficient, and our concept of stress distribution may be largely influenced by our knowledge of wind distribution. QuikSCAT reveals that the variability of stress could be very different from wind. The spatial coherence between the magnitude of stress and sea surface temperature (SST), between the divergence of surface stress and the downwind SST gradient, and between the vorticity of stress and crosswind SST gradient, are the inherent characteristics of stress (turbulence production by buoyancy) that would exist even under a uniform wind field. The coherence between stress vorticity and SST gradient is masked by the rotation of ocean currents over the Kuroshio meanders. Surface stress rotates in the opposite direction to surface currents because stress is the vector difference between wind and current. The results are in agreement with a previous study of the Agulhas Extension and confirm the unique stress measuring capability of the scatterometer.


Wind-stress ocean-front buoyancy current-shear scatterometer ocean-atmosphere-coupling divergence vorticity 


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  1. Brown, R. A. and W. T. Liu (1982): An operational large-scale marine planetary boundary layer model. J. Appl. Meteor., 2, 261–269.CrossRefGoogle Scholar
  2. Chelton, D. B., S. K. Esbensen, M. G. Schlax, N. Thum, M. H. Freilich, F. J. Wentz, C. L. Gentemann, M. J. McPhaden and P. S. Schoff (2001): Observations of coupling between surface wind stress and sea surface temperature in the eastern tropical Pacific. J. Climate, 14, 1479–1498.CrossRefGoogle Scholar
  3. Donelan, M. A., W. M. Drennan and K. B. Katsaros (1997): The air-sea momentum flux in conditions of wind sea and swell. J. Phys. Oceanogr., 27, 2087–2099.CrossRefGoogle Scholar
  4. Ducet, N., P.-Y. Le Traon and G. Reverdin (2000): Global high resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and-2. J. Geophys. Res., 105, 19477–19498.CrossRefGoogle Scholar
  5. Fairall, C. W., E. F. Bradley, D. P. Rogers, J. B. Edson and G. S. Young (1996): Bulk parameterization of air-sea fluxes for Tropical Ocean-Global Atmosphere/Coupled Ocean-Atmosphere Response Experiment (TOGA/COARE). J. Geophys. Res., 101, 3747–3764.CrossRefGoogle Scholar
  6. Lin, I.-I., W. T. Liu, C.-C. Wu, J. C. Chiang and C.-H. Sui (2003): Satellite observations of modulation of surface winds by typhoon-induced upper ocean cooling. Geophys. Res. Lett., 30(3), 1131, doi: 10.1029/2002GL015674.CrossRefGoogle Scholar
  7. Liu, W. T. (2002): Progress in scatterometer application. J. Oceanogr., 58, 121–136.CrossRefGoogle Scholar
  8. Liu, W. T. and W. G. Large (1981): Determination of surface stress by Seasat-SASS: A case study with JASIN Data. J. Phys. Oceanogr., 11, 1603–1611.CrossRefGoogle Scholar
  9. Liu, W. T. and W. Tang (1996): Equivalent Neutral Wind. JPL Pub., 96-17, Jet Propulsion Lab., Pasadena, 8 pp.Google Scholar
  10. Liu, W. T., K. B. Katsaros and J. A. Businger (1979): Bulk parameterization of air-sea exchanges in heat and water vapor including the molecular constraints at the interface. J. Atmos. Sci., 36, 1722–1735.CrossRefGoogle Scholar
  11. Liu, W. T., X. Xie, P. S. Polito, S. Xie and H. Hashizume (2000): Atmosphere manifestation of tropical instability waves observed by QuikSCAT and Tropical Rain Measuring Missions. Geophys. Res. Lett., 27, 2545–2548.CrossRefGoogle Scholar
  12. Liu, W. T., X. Xie and P. P. Niiler (2007): Ocean-atmosphere interaction over Agulhas Extension Meanders. J. Climate, 20(23), 5784–5797.CrossRefGoogle Scholar
  13. Liu, W. T., W. Tang and X. Xie (2008): Wind power distribution over global oceans. Geophys. Res. Lett. (submitted).Google Scholar
  14. Niiler, P. P. (2001): The world ocean surface circulation. p. 193–204. In Ocean Circulation and Climate—Observing and Modeling the Global Ocean, ed. by G. Siedler, J. Church and J. Gould, Academic Press, Volume 77 of International Geophysics Series.Google Scholar
  15. Niiler, P. P., N. A. Maximenko, G. G. Panteleev, Y. Yamagata and D. B. Olson (2003): Near-surface dynamical structure of the Kuroshio Extension. J. Geophys. Res., 108(C6), 3193, doi:10.1029/2002JC001461.CrossRefGoogle Scholar
  16. O’Neill, L. W., D. B. Chelton, S. K. Esbensen and F. J. Wentz (2005): High-resolution satellite measurements of the atmospheric boundary layer response to SST variation along the Agulhas Return Current. J. Climate, 18, 2706–2723.CrossRefGoogle Scholar
  17. Park, K.-A., P. Cornillon and D. L. Codiga (2006): Modification of surface winds near ocean fronts: effects of the Gulf Stream rings on scatterometer (QuikSCAT, NSCAT) wind observations. J. Geophys. Res., 111, C03021, doi:10.1029/2005JC003016.CrossRefGoogle Scholar
  18. Qiu, B. (2002): The Kuroshio Extension System: its large-scale variability and role in the midlatitude ocean-atmosphere interaction. J. Oceanogr., 58, 57–75.CrossRefGoogle Scholar
  19. Sampe, T. and S.-P. Xie (2007): Mapping high sea winds from space. Bull. Amer. Meteor. Soc., 88, 1965–1978.CrossRefGoogle Scholar
  20. Smith, S. D. (1980): Wind stress and heat flux over the ocean in gale force winds. J. Phys. Oceanogr., 10, 709–726.CrossRefGoogle Scholar
  21. Wentz, F. J. and T. Meissner (1999): AMSR Ocean Algorithm, Version 2. RSS Tech. Report 121599A, Remote Sensing Systems.Google Scholar
  22. Wentz, F. J., C. L. Gentemann, D. Smith and D. Chelton (2000): Satellite measurements of sea surface temperature through clouds. Science, 288, 847–850.CrossRefGoogle Scholar
  23. Xie, S.-P., M. Ishiwatari, H. Hashizume and K. Takeuchi (1998): Coupled ocean-atmosphere waves on the equatorial front. Geophys. Res. Lett., 25, 3863–3866.CrossRefGoogle Scholar
  24. Xie, S.-P., J. Hafner, Y. Tanimoto, W. T. Liu, H. Tokinaga and H. Xu (2002): Bathymetric effect on the winter climate through the sea surface temperature in the Yellow and East China Seas. Geophys. Res. Lett., 29(24), 2228, doi:10.1029/2002GL015884.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA

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