Climate Dynamics

, Volume 36, Issue 9–10, pp 2015–2033

A model study of factors influencing projected changes in regional sea level over the twenty-first century

Article

Abstract

In addition to projected increases in global mean sea level over the 21st century, model simulations suggest there will also be changes in the regional distribution of sea level relative to the global mean. There is a considerable spread in the projected patterns of these changes by current models, as shown by the recent Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment (AR4). This spread has not reduced from that given by the Third Assessment models. Comparison with projections by ensembles of models based on a single structure supports an earlier suggestion that models of similar formulation give more similar patterns of sea level change. Analysing an AR4 ensemble of model projections under a business-as-usual scenario shows that steric changes (associated with subsurface ocean density changes) largely dominate the sea level pattern changes. The relative importance of subsurface temperature or salinity changes in contributing to this differs from region to region and, to an extent, from model-to-model. In general, thermosteric changes give the spatial variations in the Southern Ocean, halosteric changes dominate in the Arctic and strong compensation between thermosteric and halosteric changes characterises the Atlantic. The magnitude of sea level and component changes in the Atlantic appear to be linked to the amount of Atlantic meridional overturning circulation (MOC) weakening. When the MOC weakening is substantial, the Atlantic thermosteric patterns of change arise from a dominant role of ocean advective heat flux changes.

Keywords

Sea level Climate projections Regional pattern Steric components Meridional overturning circulation 

Supplementary material

382_2009_738_MOESM1_ESM.pdf (1.3 mb)
Supplementary material (1377 KB)

References

  1. Bindoff NL, Willebrand J, Artale V, Cazenave A, Gregory JM, Gulev S, Hanawa K, LeQuéré C, Levitus S, Nojiri Y, Shum CK, Talley LD, Unnikrishnan AS (2007) Observations: oceanic climate change and sea level. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) Climate change 2007: the physical science basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, LondonGoogle Scholar
  2. Bryan K (1996) The steric component of sea level rise associated with enhanced greenhouse warming: a model study. Clim Dyn 12:545–555CrossRefGoogle Scholar
  3. Church JA, Gregory JM, Huybrechts P, Kuhn M, Lambeck K, Nhuan MT, Qin D, Woodworth PL (2001) Changes in sea level. In: Houghton JT, Ding Y, Griggs DJ, Noguer M, vander Linden P, Dai X, Maskell K, Johnson CI (eds) Climate change 2001: the scientific basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, London, pp 639–693Google Scholar
  4. Gregory JM, Church JA, Boer GJ, Dixon KW, Flato GM, Jackett DR, Lowe JA, O’Farrell SP, Roeckner E, Russell GL, Stouffer RJ, Winton M (2001) Comparison of results from several AOGCMs for global and regional sea-level change 1900–2100. Clim Dyn 18:225–240CrossRefGoogle Scholar
  5. Hsieh WW, Bryan K (1996) Redistribution of sea level rise associated with enhanced greenhouse warming: a simple model study. Clim Dyn 12:535–544CrossRefGoogle Scholar
  6. Katsman CA, Hazeleger W, Drijfhout SS, van Oldenborgh GJ, Burgers G (2008) Climate scenarios of sea level rise for the northeast atlantic ocean: a study including the effects of ocean dynamics and gravity changes induced by ice melt. Clim Change 91:351–374CrossRefGoogle Scholar
  7. Köhl A, Stammer D (2008) Decadal sea level changes in the 50-year GECCO ocean synthesis. J Clim 21:1876–1890. doi:10.1175/2007JCLI2081.1 CrossRefGoogle Scholar
  8. Landerer FW, Jungclaus JH, Marotzke J (2007a) Ocean bottom pressure changes lead to a decreasing length-of-day in a warming climate. Geophys Res Lett 34(L06307). doi: 10.1029/2006GL029106
  9. Landerer FW, Jungclaus JH, Marotzke J (2007b) Regional dynamic and steric sea level change in response to the IPCC-A1B scenario. J Phys Oceanogr 37:296–312CrossRefGoogle Scholar
  10. Levermann A, Griesel A, Hofmann M, Montoya M, Rahmstorf S (2005) Dynamic sea level changes following changes in the thermohaline circulation. Clim Dyn 24:347–354. doi:10.1007/s00382-004-0505-y CrossRefGoogle Scholar
  11. Lowe JA, Gregory JM (2006) Understanding projections of sea level rise in a Hadley Centre coupled climate model. J Geophys Res p C11014. doi:10.1029/2005JC003421
  12. Meehl GA, Stocker TF, Collins WD, Friedlingstein P, Gaye AT, Gregory JM, Kitoh A, Knutti R, Murphy JM, Noda A, Raper SCB, Watterson IG, Weaver AJ, Zhao Z (2007) Global climate projections. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) Climate change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, LondonGoogle Scholar
  13. Mitrovica JX, Gomez N, Clark PU (2009) The sea-level fingerprint of West Antarctic collapse. Science 323:753CrossRefGoogle Scholar
  14. Murphy J, Booth B, Collins M, Harris G, Sexton D, Webb M (2007) A methodology for probabilistic predictions of regional climate change from perturbed physics ensembles. Philos Trans R Soc Lond 365:2133CrossRefGoogle Scholar
  15. Murphy JM, Sexton DMH, Barnett DN, Jones GS, Webb MJ, Collins M, Stainforth DA (2004) Quantification of modelling uncertainties in a large ensemble of climate change simulations. Nature 430:768–772CrossRefGoogle Scholar
  16. Nicholls RJ, Carter TR, Warrick RA, Lowe JA, Lu X, O’Neill BC, Hanson SE, Long AJ (2009) Guidelines on constructing sea level scenarios for impact and vulnerability assessment of coastal areas. supporting material, Intergovernmental Panel on Climate Change Task Group on data and scenario support for Impact and Climate Analysis (TGICA) (in review)Google Scholar
  17. Pardaens A, Vellinga M, Wu P, Ingleby B (2008) Large-scale Atlantic salinity changes over the last half-century: a model-observation comparison. J Clim 21:1698–1720. doi:10.1175/2007JCLI1988.1 CrossRefGoogle Scholar
  18. Russell GL, Gornitz V, Miller JR (2000) Regional sea-level changes projected by the NASA/GISS atmosphere-ocean model. Clim Dyn 16:789–797CrossRefGoogle Scholar
  19. Russell JL, Dixon KW, Gnanadesikan A, Stouffer RJ, Toggweiler JR (2006) The southern hemisphere westerlies in a warming world: propping open the door to the deep ocean. J Clim 19:6382–6390CrossRefGoogle Scholar
  20. Sato Y, Yukimoto S, Tsujino H, Ishizaki H, Noda A (2006) Response of North Pacific ocean circulation in a Kuroshio-resolving ocean model to an Arctic Oscillation (AO)-like change in northern hemisphere atmospheric circulation due to greenhouse-gas forcing. J Meteorol Soc Jpn 84(2):295–309CrossRefGoogle Scholar
  21. Suzuki T, Hasumi H, Sakamoto TT, Nishimura T, Abe-Ouchi A, Segawa T, Okada N, Oka A, Emori S (2005) Projection of future sea level and its variability in a high-resolution climate model: ocean processes and greenland and antarctic ice-melt contributions. Geophys Res Lett 32. doi:10.1029/2005GL023677
  22. Vellinga M, Wood RA (2007) Impacts of thermohaline circulation shutdown in the twenty-first century. Clim Change. doi:10.1007/s10584-006-9146-y
  23. Yin J, Schlesinger ME, Stouffer RJ (2009) Model projections of rapid sea-level rise on the northeast coast of the United States. Nat Geosci 2:262–266. doi:10.1038/ngeo462 CrossRefGoogle Scholar

Copyright information

© Her Majesty the Queen in Rights of the United Kingdom 2010 2010

Authors and Affiliations

  • Anne K. Pardaens
    • 1
  • J. M. Gregory
    • 1
    • 2
  • J. A. Lowe
    • 1
  1. 1.Met Office, Hadley CentreExeterUK
  2. 2.Department of Meteorology, Walker Institute for Climate System ResearchUniversity of ReadingReadingUK

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