Attribution of Weather and Climate-Related Events

  • Peter A. StottEmail author
  • Myles Allen
  • Nikolaos Christidis
  • Randall M. Dole
  • Martin Hoerling
  • Chris Huntingford
  • Pardeep Pall
  • Judith Perlwitz
  • Dáithí Stone


Unusual or extreme weather and climate-related events are of great public concern and interest, yet there are often conflicting messages from scientists about whether such events can be linked to climate change. There is clear evidence that climate has changed as a result of human-induced greenhouse gas emissions, and that across the globe some aspects of extremes have changed as a result. But this does not imply that human influence has significantly altered the probability of occurrence or risk of every recently observed weather or climate-related event, or that such events are likely to become significantly more or less frequent in the future. Conversely, it is sometimes stated that it is impossible to attribute any individual weather or climate-related event to a particular cause. Such a statement can be interpreted to mean that human-induced climate change could never be shown to be at least partly responsible for any specific weather event, either the probability of its occurrence or its magnitude. There is clear evidence from recent case studies that individual event attribution is a feasible, if challenging, undertaking.

We propose a way forward, through the development of carefully calibrated physically-based assessments of observed weather and climate-related events, to identify changed risk of such events attributable to particular factors including estimating the contributions of factors to event magnitude. Although such event-specific assessments have so far only been attempted for a relatively small number of specific cases, we describe research under way, coordinated as part of the international Attribution of Climate-related Events (ACE) initiative, to develop the science needed to better respond to the demand for timely, objective, and authoritative explanations of extreme events. The paper considers the necessary components of a prospective event attribution system, reviews some specific case studies made to date (Autumn 2000 UK floods, summer 2003 European heatwave, annual 2008 cool US temperatures, July 2010 Western Russia heatwave) and discusses the challenges involved in developing systems to provide regularly updated and reliable attribution assessments of unusual or extreme weather and climate-related events.


Attribution Extreme weather Climate variability Climate change 



 The authors acknowledge the support of the UK FCO in funding meetings of the Attribution of Climate-related Events initiative. The authors acknowledge the support of the International Detection and Attribution Group by the US Department of Energy’s Office of Science, Office of Biological and Environmental Research and the US National Oceanic and Atmospheric Administration’s Climate Program Office. DAS received funding from Microsoft Research. PAS and NC were supported by the Joint DECC/Defra Met Office Hadley Centre Climate Programme (GA01101). CH acknowledges the Centre for Ecology and Hydrology Science Budget.


  1. Adam D (2011) Climate change in court. Nat Clim Chang 1:127–130CrossRefGoogle Scholar
  2. Alexander LV (2011) Climate science: extreme heat rooted in dry soils. Nat Geosci 4:12–13. doi: 10.1038/ngeo1045 CrossRefGoogle Scholar
  3. Allen MR (2003) Liability for climate change. Nature 421:891–892CrossRefGoogle Scholar
  4. Allen M, Pall P, Stone D, Stott P, Frame D, Min S-K, Nozawa T, Yukimoto S (2007) Scientific challenges in the attribution of harm to human influence on climate. Univ Pa Law Rev 155:1353–1400Google Scholar
  5. Arribas A, Glover M, Maidens A, Peterson K, Gordon M, MacLachlan C (2009) Towards a new generation of seasonal forecasting systems. Fisica de la Tierra 21:219–224Google Scholar
  6. Barriopedro D, Fischer EM, Luterbacher J, Trigo R, Ricardo M (2011) The hot summer of 2010: redrawing the temperature record map of Europe. Science 332:220–224CrossRefGoogle Scholar
  7. BBC (2011) Last December UK’s coldest for 100 years. Online piece available at
  8. Beniston M (2004) The 2003 heat wave in Europe: a shape of things to come? An analysis based on Swiss climatological data and model simulations. Geophys Res Lett 31:L02202. doi: 10.1029/2003GL018857 CrossRefGoogle Scholar
  9. Blunden J, Arndt DS (2012) State of the climate in 2011. Bull Am Meteor Soc 93(7):S1–S264CrossRefGoogle Scholar
  10. Bowler NE, Arribas A, Beare SE, Mylne KR, Shutts GJ (2009) The local ETKF and SKEB: upgrades to the MOGREPS short-range ensemble prediction system. Q J R Meteorol Soc 135:767–776CrossRefGoogle Scholar
  11. Büntgen U, Brázdil R, Heussner K-U, Hofmann J, Kontic R, Kyncl T, Pfister C, Chromá K, Tegel W (2011) Combined dendro-documentary evidence of central European hydroclimatic springtime extremes over the last millennium. Q Sci Rev 30:3947–3959CrossRefGoogle Scholar
  12. Cattiaux J, Vautard R, Cassou C, Yiou P, Masson-Delmotte V, Codron F (2010a) Winter 2010 in Europe: a cold extreme in a warming climate. Geophys Res Lett 37:L20704. doi: 10.10129/2010GL044613 CrossRefGoogle Scholar
  13. Cattiaux J, Vautard R, Yiou P (2010b) North-Atlantic SST amplified recent wintertime European land temperature extremes and trends. Clim Dyn 26:2113–2128. doi: 10.1007/s00382-010-0869-0 Google Scholar
  14. Christidis N, Stott PA (2012) Lengthened odds of the cold UK winter of 2010/11 attributable to human influence. In: Peterson TC, Stott PA, Herring S (eds) Explaining extreme events of 2011 from a climate perspective. Bull Am Meteor Soc 93:1041–1067. doi: 10.1175/BAMS-D-12-00021.1 Google Scholar
  15. Christidis N, Stott PA, Brown S, Hegerl GC, Caesar J (2010) Detection of changes in temperature extremes during the second half of the 20th century. Geophys Res Lett 32:L20716. doi: 10.1029/2005GL023885 CrossRefGoogle Scholar
  16. Christidis N, Stott PA, Jones GS, Shiogama H, Nozawa T, Luterbacher J (2010a) Human activity and anomalously warm seasons in Europe. Int J Climatol. doi: 10.1002/joc.2262 Google Scholar
  17. Christidis N, Stott PA, Zwiers FW, Shiogama H, Nozawa T (2010b) Probabilistic estimates of recent changes in temperature: a multi-scale attribution analysis. Clim Dyn 34:1139–1156. doi: 10.1007/s00382-009-0615-7 CrossRefGoogle Scholar
  18. Christidis N, Stott PA, Brown SJ (2011a) The role of human activity in the recent warming of extremely warm days. J Clim 24:1922–1930. doi: 10.1175/2011JCLI4150.1 CrossRefGoogle Scholar
  19. Christidis N, Stott PA, Zwiers FW, Shiogama H, Nozawa T (2011b) The contribution of anthropogenic forcings to regional changes in temperature during the last decade. Clim Dyn. doi: 10.1007/s00382-011-1184-0 Google Scholar
  20. Christidis N, Stott PA, Scaife AA, Arribas A, Jones GS, Copsey D, Knight JR, Tennant WJ (2012) A new HadGEM3-A based system for attribution of weather and climate-related extreme events. J Climate. doi: 10.1175/JCLI-D-12-00169.1 Google Scholar
  21. Collins M, Booth BBB, Harris GR, Murphy JM, Sexton DMH, Webb MJ (2006) Towards quantifying uncertainty in transient climate change. Clim Dyn 27:127–147CrossRefGoogle Scholar
  22. Coumou D, Rahmstorf S (2012) A decade of weather extremes. Nat Clim Chang. doi: 10.1038/NCLIMATE1452 Google Scholar
  23. David A Grossman (2003) Warming up to a not-so-radical idea: tort-based climate change litigation, 28 COLUM. J Envtl L 1:23Google Scholar
  24. Dole R et al (2011) Was there a basis for anticipating the 2010 Russian heat wave? Geophys Res Lett 38:L06702. doi: 10.1029/2010GL046582 CrossRefGoogle Scholar
  25. Haufler V (Lead Author), Maggie L. Walser (Topic Editor) (2009) Insurance and reinsurance in a changing climate. In: Cleveland CJ (ed) Encyclopedia of earth. Environmental Information Coalition, National Council for Science and the Environment. Washington, DC. First published in the encyclopedia of earth July 24, 2009; Last revised Date August 30, 2011. Retrieved 18 May 2012
  26. Hawkins E, Sutton R (2012) Time of emergence of climate signals. Geophys Res Lett 39:L01702. doi: 10.1029/2011GL050087 CrossRefGoogle Scholar
  27. Hegerl GC, Zwiers FW (2011) Use of models in detection and attribution of climate change. WIREs Clim Chang 2:570–591CrossRefGoogle Scholar
  28. Hegerl GC, Zwiers FW, Barconnot P, Gillett NP, Luo Y, Merengo Orsini JA, Nicholls N, Penner JE, Stott PA (2007) Understanding and attributing climate change. In: Climate change 2007: the physical science basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, CambridgeGoogle Scholar
  29. Hegerl GC, Hoegh-Guldberg O, Casassa G, Hoerling MP, Kovats RS, Parmesan C, Pierce DW, Stott PA (2010) Good practice guidance paper on detection and attribution related to anthropogenic climate change. In: Stocker TF, Field CB, Qin D, Barros V, Plattner G-K, Tignor M, Midgely PM, Ebi KL (eds). Meeting report of the intergovernmental panel on climate change expert meeting on detection and attribution of anthropogenic climate change. IPCC working group I Technical Support Unit, University of Bern, BernGoogle Scholar
  30. Hoegh-Guldberg O, Hegerl G, Root T, Zwiers F, Stott P, Pierce D, Allen M (2011) Difficult but not impossible. Nat Clim Change 1:72Google Scholar
  31. Hoerling MP et al (2012) Anatomy of an extreme event. J Climate (submitted)Google Scholar
  32. Hulme M, O’Neill SJ, Dessai S (2011) Is weather event attribution necessary for adaptation funding? Science 334:764Google Scholar
  33. IPCC (2007) Climate Change 2007: impacts, adaptation and vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Parry ML, Canziani OF, Palutikof JP, van der Linden PJ, Hanson CE (eds). Cambridge University Press, Cambridge, 976 ppGoogle Scholar
  34. Jones GS, Stott PA, Christidis N (2008) Human contribution to rapidly increasing frequency of very warm northern hemisphere summers. J Geophys Res 113:D02109. doi: 10.1029/2007JD008914 CrossRefGoogle Scholar
  35. Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Leetmaa A, Reynolds R, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo KC, Ropelewski C, Wang J, Jenne R, Joseph D (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–470CrossRefGoogle Scholar
  36. Kay AL, Crooks SM, Pall P, Stone DA (2011) Attribution of autumn/winter 2000 flood risk in England to anthropogenic climate change: a catchment-based study. J Hydrol 406:97–112CrossRefGoogle Scholar
  37. Kinter J, Folland C (2011) The international CLIVAR Climate of the 20th Century project: report of the Fifth Workshop. CLIVAR Exchanges 57:39–42Google Scholar
  38. Knutti R, Furrrer R, Tebaldi C, Cermak J, Meehl GA (2010) Challenges in combining projections from multiple climate models. J Clim 23:2739–2758CrossRefGoogle Scholar
  39. Leiserowitz A, Maibach E, Roser-Renouf C, Hmielowski JD (2012a) Climate change in the American mind: Americans’ global warming beliefs and attitudes in March 2012. Yale University and George Mason University. Yale Project on Climate Change Communication, New Haven, CT. Available at
  40. Leiserowitz A, Maibach E, Roser-Renouf C, Hmielowski JD (2012b) Extreme weather, climate & preparedness in the American mind. Yale University and George Mason University. Yale Project on Climate Change Communication, New Haven. Available at
  41. Massey N, Aina T, Rye, C, Otto FEL, Wilson S, Jones RG, Allen MR (2012) Have the odds of warm November temperatures and of cold December temperatures in Central England changed? In: Peterson TC, Stott PA, Herring S (eds) 2012. Explaining extreme events of 2011 from a climate perspective. Bull Am Meteor Soc 93:1041–1067. doi: 10.1175/BAMS-D-12-00021.1
  42. Min S-K, Zhang X, Zwiers FW, Hegerl GC (2011) Human contribution to more intense precipitation extremes. Nature 470:378–381CrossRefGoogle Scholar
  43. Morak S, Hegerl G, Kenyon J (2011) Detectable regional changes in the number of warm nights. Geophys Res Lett 38:L17703CrossRefGoogle Scholar
  44. Morak S, Hegerl GC, Christidis N (2012) Detectable changes in the frequency of temperature extremes. J Climate 26:1561–1574Google Scholar
  45. 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
  46. Nature editorial (2011) Heavy weather. Nature 477:131–132Google Scholar
  47. Nozawa T, Nagashima T, Shiogama H, Crooks S (2005) Detecting natural influence on surface air temperature in the early twentieth century. Geophys Res Lett 32:L20719. doi: 10.1029/2005GL023540 CrossRefGoogle Scholar
  48. Otto FEL, Massey N, van Oldenborgh GJ, Jones RG, Allen MR (2012) Reconciling two approaches to attribution of the 2010 Russian heatwave. Geophys Res Lett 39:L04702. doi: 10.1029/2011GL050422 CrossRefGoogle Scholar
  49. Pall P, Aina T, Stone DA, Stott PA, Nozawa T, Hilberts AGJ, Lohmann D, Allen MR (2011) Anthropogenic greenhouse gas contribution to flood risk in England and Wales in autumn 2000. Nature 470:382–385CrossRefGoogle Scholar
  50. Perlwitz J, Hoerling M, Eischeid J, Xu T, Kumar A (2009) A strong bout of natural cooling in 2008. Geophys Res Lett 36Google Scholar
  51. Peterson TC, Stott PA, Herring S (eds) (2012) Explaining extreme events of 2011 from a climate perspective. Bull Am Meteor Soc 93:1041–1067. doi: 10.1073/pnas.1101766108 Google Scholar
  52. Rahmstorf S, Coumou D (2011) Increase of extreme events in a warming world. Proc Natl Acad Sci. doi: 10.1073/pnas.1101766108 Google Scholar
  53. Räisänen J, Ruokolainen L (2008) Estimating present climate in a warming world: a model-based approach. Clim Dyn 31:573–585CrossRefGoogle Scholar
  54. Rayner NA, Parker DE, Horton EB, Folland CK, Alexander LV, Rowell DP, Kent EC, Kaplan A (2003) Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. J Geophys Res 108(D14):4407. doi: 10.1029/2002JD002670 CrossRefGoogle Scholar
  55. Royal Society (2009) Geoengineering the climate: science, governance and uncertainty (Report), London, UK. p 1. ISBN 978-0-85403-773-5Google Scholar
  56. Sampei Y, Aoyagi-Usoi M (2009) Mass-media coverage, its influence on public awareness of climate-change issue, and implications for Japan’s national campaign to reduce greenhouse gas emissions. Glob Environ Chang 19:203–212CrossRefGoogle Scholar
  57. Scaife AA et al (2008) The CLIVAR C20C project: selected twentieth century climate events. Clim Dyn. doi: 10.1007/s00382-008-0451-1 Google Scholar
  58. Scaife AA, Woolings T, Knight J, Martin G, Hinton T (2010) Atmospheric blocking and mean biases in models. J Clim 23:6143–6152CrossRefGoogle Scholar
  59. Schar C, Jendritzky G (2004) Hot news from summer 2003. Nature 432:559–560CrossRefGoogle Scholar
  60. Schiermeier Q (2011) Extreme measures. Nature 477:148–149CrossRefGoogle Scholar
  61. Seneviratne SI, Nicholls N, Easterling D, Goodess CM, Kanae S, Kossin J, Luo Y, Marengo J, McInnes K, Rahimi M, Reichstein M, Sorteberg A, Vera C, Zhang X (2012) Changes in climate extremes and their impacts on the natural physical environment. In: Field CB, Barros V, Stocker TF, Qin D, Dokken DJ, Ebi KL, Mastrandrea MD, MachKJ, Plattner G-K, Allen SK, Tignor M, Midgley PM (eds) Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation. A special report of working groups I and II of the Intergovernmental Panel on Climate Change (IPCC). Cambridge University Press, Cambridge/New York, pp 109–230Google Scholar
  62. Smith RL (2003) Statistics of extremes, with applications in environment, insurance and finance. In: Finkenstadt B, Rootzen H (eds) Extreme values in finance, telecommunications and the environment. Chapman and Hall/CRC Press, LondonGoogle Scholar
  63. Smith DM, Scaife AA, Kirtman BP (2012) What is the current state of scientific knowledge with regard to seasonal and decadal forecasting ? Environ Res Lett 7:015602. doi: 10.1088/1748-9326/7/1/015602 CrossRefGoogle Scholar
  64. Stone DA, Allen MR (2005) Tne end-to-end attribution problem: from emissions to impacts. Clim Change 71:303–318CrossRefGoogle Scholar
  65. Stott PA, Thorne PW (2010) How best to log local temperatures? Nature 465:158–159CrossRefGoogle Scholar
  66. Stott PA, Stone DA, Allen MR (2004) Human contribution to the European heatwave of 2003. Nature 432:610–614CrossRefGoogle Scholar
  67. Stott PA, Jones GS, Lowe JA, Thorne P, Durman CF, Johns TC, Thelen J-C (2006) Transient climate simulations with the HadGEM1 climate model: causes of past warming and future climate change. J Clim 19:2763–2782CrossRefGoogle Scholar
  68. Stott PA, Gillett NP, Hegerl GC, Karoly D, Stone D, Zhang X, Zwiers F (2010) Detection and attribution of climate change: a regional perspective. WIREs Clim Chang 1:192–211Google Scholar
  69. Stott PA, Christidis N, Betts RA (2011) Changing return periods of weather-related impacts: the attribution challenge. Clim Chang 109:263–268CrossRefGoogle Scholar
  70. Stott PA, Peterson TC, Herring S (2012a) Introduction. In: Peterson T, Stott PA, Herring S (eds) Explaining extreme events of 2011 from a climate perspective. BAMS, 93, 1041-1047, 10.1175/BAMS-D-12-00021.1Google Scholar
  71. Stott PA, Peterson TC, Herring S (2012b) Conclusions. In: Peterson T, Stott PA, Herring S (eds) Explaining extreme events of 2011 from a climate perspective. BAMS, 93, 1041-1047, 10.1175/BAMS-D-12-00021.1Google Scholar
  72. Thorne PW et al (2011) Guiding the creation of a comprehensive temperature resource for twenty-first century climate science. Bull Am Meteorol Soc 92(11):ES40–ES47CrossRefGoogle Scholar
  73. Trenberth KE (2012) Framing the way to relate climate extremes to climate change. Clim Change 115(2):283–290. doi: 10.1007/s10584-012-0441-5 CrossRefGoogle Scholar
  74. Trenberth KE (2008) Observational needs for climate prediction and adaptation. WMO Bull 57:17–21Google Scholar
  75. Trenberth KE (2011) Attribution of climate variations and trends to human influences and natural variability. WIREs Clim Change 2(6):925–930. doi: 10.1002/wcc.142, Wiley-BlackwellCrossRefGoogle Scholar
  76. Vautard R, Yiou P (2009) Control of recent European surface climate change by atmospheric flow. Geophys Res Lett 36, L22702. doi: 10.1029/2009GL040480 CrossRefGoogle Scholar
  77. Wilks DS (1995) Statistical methods in the atmospheric sciences: an introduction. Academic, San Diego, 467ppGoogle Scholar
  78. Zwiers FW, Zhang X, Feng Y (2011) Anthropogenic influence on long return period daily temperature extremes at regional scales. J Clim 24:881–892CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Peter A. Stott
    • 1
    Email author
  • Myles Allen
    • 2
  • Nikolaos Christidis
    • 1
  • Randall M. Dole
    • 3
  • Martin Hoerling
    • 3
  • Chris Huntingford
    • 4
  • Pardeep Pall
    • 5
    • 6
  • Judith Perlwitz
    • 7
    • 8
  • Dáithí Stone
    • 6
    • 9
  1. 1.Met Office/Hadley CentreExeterUK
  2. 2.School of Geography and the EnvironmentUniversity of OxfordOxfordUK
  3. 3.NOAA Earth System Research LaboratoryBoulderUSA
  4. 4.Centre for Ecology and HydrologyWallingford, OxonUK
  5. 5.ETH Zurich, Institute for Atmospheric and Climate ScienceZurichSwitzerland
  6. 6.Lawrence Livermore National LaboratoryBerkeley LabBerkeleyUSA
  7. 7.Physical Sciences DivisionNOAA Earth System Research LaboratoryBoulderUSA
  8. 8.University of ColoradoBoulderUSA
  9. 9.University of Cape TownRondeboschSouth Africa

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