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Improved estimates of upper-ocean warming and multi-decadal sea-level rise

Nature volume 453, pages 10901093 (19 June 2008) | Download Citation

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Abstract

Changes in the climate system’s energy budget are predominantly revealed in ocean temperatures1,2 and the associated thermal expansion contribution to sea-level rise2. Climate models, however, do not reproduce the large decadal variability in globally averaged ocean heat content inferred from the sparse observational database3,4, even when volcanic and other variable climate forcings are included. The sum of the observed contributions has also not adequately explained the overall multi-decadal rise2. Here we report improved estimates of near-global ocean heat content and thermal expansion for the upper 300 m and 700 m of the ocean for 1950–2003, using statistical techniques that allow for sparse data coverage5,6,7 and applying recent corrections8 to reduce systematic biases in the most common ocean temperature observations9. Our ocean warming and thermal expansion trends for 1961–2003 are about 50 per cent larger than earlier estimates but about 40 per cent smaller for 1993–2003, which is consistent with the recognition that previously estimated rates for the 1990s had a positive bias as a result of instrumental errors8,9,10. On average, the decadal variability of the climate models with volcanic forcing now agrees approximately with the observations, but the modelled multi-decadal trends are smaller than observed. We add our observational estimate of upper-ocean thermal expansion to other contributions to sea-level rise and find that the sum of contributions from 1961 to 2003 is about 1.5 ± 0.4 mm yr-1, in good agreement with our updated estimate of near-global mean sea-level rise (using techniques established in earlier studies6,7) of 1.6 ± 0.2 mm yr-1.

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References

  1. 1.

    , & Warming of the world ocean, 1955–2003. Geophys. Res. Lett. 32 L02604 10.1029/2004GL021592 (2005)

  2. 2.

    et al. in Climate Change 2007: The Physical Science Basis. Contribution of Working Group 1 to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (eds Solomon, S. et al.) 385–432 (Intergovernmental Panel on Climate Change, Cambridge, 2007)

  3. 3.

    , , , & Simulated and observed decadal variability in ocean heat content. Geophys. Res. Lett. 31 L15312 10.1029/2004GL02058 (2004)

  4. 4.

    et al. Simulated and observed variability in ocean temperature and heat content. Proc. Natl Acad. Sci. USA 204, 10768–10773 (2007)

  5. 5.

    , & Reduced space optimal interpolation of historical marine sea level pressure. J. Clim. 13, 2987–3002 (2000)

  6. 6.

    , , , & Estimates of the regional distribution of sea-level rise over the 1950 to 2000 period. J. Clim. 17, 2609–2625 (2004)

  7. 7.

    & A 20th century acceleration in global sea-level rise. Geophys. Res. Lett. 33 L01602 10.1029/2005GL024826 (2006)

  8. 8.

    et al. Changing eXpendable BathyThermograph fall-rates and their impact on estimates of thermosteric sea level rise. J. Clim. 10.1175/2008JCLI2290.1 (in the press)

  9. 9.

    & How much is the ocean really warming? Geophys. Res. Lett. 34 L01610 10.1029/2006GL027834 (2007)

  10. 10.

    , , & Correction to ‘Recent cooling of the upper ocean’. Geophys. Res. Lett. 34 L16601 10.1029/2007GL030323 (2007)

  11. 11.

    & Quality control of ocean temperature and salinity profiles—historical and real time data. J. Mar. Syst. 65, 158–175 (2007)

  12. 12.

    , , & Steric sea level changes estimated from historical ocean subsurface temperature and salinity analyses. J. Oceanogr. 62, 155–170 (2006)

  13. 13.

    , & Thermosteric sea level rise, 1955–2003. Geophys. Res. Lett. 32 L12602 10.1029/2005GL023112 (2005)

  14. 14.

    Decadal-scale temperature trends in the Southern Hemisphere ocean. J. Clim. 10.1175/2008JCLI2131.1 (in the press)

  15. 15.

    , & Interannual variability in upper-ocean heat content, temperature and thermosteric expansion on global scales. J. Geophys. Res. 109 C12037 10.10292003JC002260 (2004)

  16. 16.

    , & Significant decadal-scale impact of volcanic eruptions on sea level and ocean heat content. Nature 438, 74–77 (2005)

  17. 17.

    et al. Krakatoa lives: The effect of volcanic eruptions on ocean heat content and thermal expansion. Geophys. Res. Lett. 33 L17702 10.1029/2006GL026771 (2006)

  18. 18.

    , & The impact of aerosols on simulated ocean temperature, heat content, and sea level in the 20th century. Geophys. Res. Lett. 32 L24709 10.1029/2005GL024457 (2005)

  19. 19.

    et al. in Climate Change 2001: The Scientific Basis. Contribution of Working Group 1 to the Third Assessment Report of the Intergovernmental Panel on Climate Change (eds Houghton, J. T. et al.) 639–693 (Cambridge Univ. Press, Cambridge, 2001)

  20. 20.

    & Recent western South Atlantic bottom water warming. Geophys. Res. Lett. 33 L14614 10.1029/2006GL026769 (2006)

  21. 21.

    , , & Recent bottom water warming in the Pacific Ocean. J. Clim. 13, 2987–3002 (2007)

  22. 22.

    , & Interannual to decadal changes in the ECCO Global Synthesis. J. Phys. Oceanogr. 37, 313–337 (2007)

  23. 23.

    & Glaciers and the Changing Earth System: A 2004 Snapshot (Occasional Paper 58, Institute of Arctic and Alpine Research, Univ. of Colorado, 2005)

  24. 24.

    et al. in Climate Change 2007: The Physical Science Basis. Contribution of Working Group 1 to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (eds Solomon, S. et al.) 337–383 (Intergovernmental Panel on Climate Change, Cambridge, 2007)

  25. 25.

    , , , & Effects of land water storage on global mean sea level over the past half century. Geophys. Res. Lett. 32, 9704–9707 (2005)

  26. 26.

    , & Impact of artificial reservoir water impoundment on global sea level. Science 320, 212–214 (2008)

  27. 27.

    & A new globally complete monthly historical mean sea level pressure dataset (HadSLP2): 1850–2004. J. Clim. 19, 5816–5842 (2006)

  28. 28.

    , , & Nonlinear trends and multiyear cycles in sea level records. J. Geophys. Res. 111 C09012 10.1029/2005JC003229 (2006)

  29. 29.

    et al. Recent climate observations compared to projections. Science 316 709 10.1126/science.1136843 (2006)

  30. 30.

    et al. Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. J. Geophys. Res. 108 4407 10.1029/2002JD002670 (2003)

  31. 31.

    , & A monthly and latitudinally varying volcanic forcing dataset in simulations of the 20th century climate. Geophys. Res. Lett. 30 16257 10.1029/2003GL016875 (2003)

  32. 32.

    , & Observed temperature trends in the Indian Ocean over 1960–1999 and associated mechanisms. Geophys. Res. Lett. 34, L02606 10.1029/2006GL028044 (2007)

  33. 33.

    et al. World Ocean Atlas 2001: Objective Analyses, Data Statistics, and Figures, CD-ROM Documentation (National Oceanographic Data Center, Silver Spring, MD, 2002)

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Acknowledgements

This paper is a contribution to the Commonwealth Scientific Industrial Research Organization (CSIRO) Climate Change Research Program and Wealth from Oceans Flagship and was supported by the Australian Government’s Cooperative Research Centres Programme through the Antarctic Climate and Ecosystems Cooperative Research Centre. C.M.D., J.A.C., N.J.W. and S.E.W. were partly funded by the Australian Climate Change Science Program. We acknowledge the modelling groups, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) and the WCRP’s Working Group on Coupled Modelling (WGCM) for their roles in making available the WCRP CMIP-3 multi-model data set. Support for P.J.G. and this data set at the Lawrence Livermore National Laboratory was provided by the Office of Science, US Department of Energy. The Centre for Australian Weather and Climate Research is a partnership between CSIRO and the Australian Bureau of Meteorology.

Author Contributions C.M.D. completed the analysis to determine the changes in ocean heat content and thermosteric sea-level rise and shared responsibility for writing the manuscript. J.A.C. conceived the study, directed the analysis and shared responsibility for writing the manuscript. N.J.W. completed the analysis of the sea-level data and provided the software for the sea-level and thermosteric sea-level reconstructions. P.J.G. analysed the model results. S.E.W. provided the corrections for the XBT data and the climatology, and made valuable comments. P.M.B. provided the pressure corrections to the Argo data. J.R.D. quality-controlled the Argo data. All authors contributed to the final version of the manuscript.

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  1. Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart, Tasmania 7001, Australia

    • Catia M. Domingues
    • , John A. Church
    • , Neil J. White
    • , Susan E. Wijffels
    • , Paul M. Barker
    •  & Jeff R. Dunn
  2. Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Private Bag 80, Tasmania 7001, Australia

    • John A. Church
    •  & Neil J. White
  3. Program for Climate Model Diagnosis and Intercomparison, Lawrence Livermore National Laboratory, Mail Code L-103, 7000 East Avenue, Livermore, California 94550, USA

    • Peter J. Gleckler

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Correspondence to Catia M. Domingues.

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    The file contains Supplementary Notes and Supplementary Table S1 with detail of and a table summarizing the climate models results used in the manuscript.

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https://doi.org/10.1038/nature07080

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