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Carbon budgets for 1.5 and 2 °C targets lowered by natural wetland and permafrost feedbacks

An Author Correction to this article was published on 15 October 2018

This article has been updated

Abstract

Global methane emissions from natural wetlands and carbon release from permafrost thaw have a positive feedback on climate, yet are not represented in most state-of-the-art climate models. Furthermore, a fraction of the thawed permafrost carbon is released as methane, enhancing the combined feedback strength. We present simulations with an inverted intermediate complexity climate model, which follows prescribed global warming pathways to stabilization at 1.5 or 2.0 °C above pre-industrial levels by the year 2100, and which incorporates a state-of-the-art global land surface model with updated descriptions of wetland and permafrost carbon release. We demonstrate that the climate feedbacks from those two processes are substantial. Specifically, permissible anthropogenic fossil fuel CO2 emission budgets are reduced by 9–15% (25–38 GtC) for stabilization at 1.5 °C, and 6–10% (33–52 GtC) for 2.0 °C stabilization. In our simulations these feedback processes respond more quickly at temperatures below 1.5 °C, and the differences between the 1.5 and 2 °C targets are disproportionately small. This key finding holds for transient emission pathways to 2100 and does not account for longer-term implications of these feedback processes. We conclude that natural feedback processes from wetlands and permafrost must be considered in assessments of transient emission pathways to limit global warming.

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Fig. 1: Time series for the control model ensemble.
Fig. 2: Response of the permafrost soil column to warming through the twenty-first century.
Fig. 3: Summary results for the natural methane feedback experiment.

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Change history

  • 15 October 2018

    In the version of this Article originally published, a parallelization coding problem, which meant that a subset of model grid cells were subjected to erroneous updating of atmospheric gas concentrations, resulted in incorrect calculation of atmospheric CO2 for these grid cells, and therefore underestimation of the carbon uptake by land through vegetation growth and eventual increases to soil carbon stocks. Having re-run the simulations using the corrected code, the authors found that the original estimates of the impact of the natural wetland methane feedback were overestimated. The permafrost and natural wetland methane feedback requires lower permissible emissions of 9–15% to achieve climate stabilization at 1.5 °C, compared with the original published estimate of 17–23%. The Article text, Table 1 and Fig. 3 have been updated online to reflect the revised numerical estimates. The Supplementary Information file has also been amended, with Supplementary Figs 6, 7, 8 and 9 replaced with revised versions produced using the corrected model output. As the strength of feedbacks remain significant, still require inclusion in climate policy and are nonlinear with global warming, the overall conclusions of the Article remain unchanged.

References

  1. Copenhagen Accord FCCC/CP/2015/L.9/Rev.1 (UNFCCC, 2009).

  2. Adoption of the Paris Agreement FCCC/CP/2015/L.9/Rev.1 (UNFCCC, 2015).

  3. Huntingford, C. et al. The link between a global 2 °C warming threshold and emissions in years 2020, 2050 and beyond. Environ. Res. Lett. 7, 014039 (2012).

    Article  Google Scholar 

  4. Rogelj, J., McCollum, D. L., Reisinger, A., Meinshausen, M. & Riahi, K. Probabilistic cost estimates for climate change mitigation. Nature 493, 79–83 (2013).

    Article  Google Scholar 

  5. Huntingford, C. & Mercado, L. M. High chance that current atmospheric greenhouse concentrations commit to warmings greater than 1.5°C over land. Sci. Rep. 6, 30294 (2016).

    Article  Google Scholar 

  6. IPCC Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) (Cambridge Univ. Press, 2013).

  7. Cox, P. M., Betts, R. A., Jones, C. D., Spall, S. A. & Totterdell, I. J. Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model. Nature 408, 184–187 (2000).

    Article  Google Scholar 

  8. Gedney, N., Cox, P. M. & Huntingford, C. Climate feedback from wetland methane emissions. Geophys. Res. Lett. 31, L20503 (2004).

    Article  Google Scholar 

  9. Shindell, D. T., Walter, B. P. & Faluvegi, G. Impacts of climate change on methane emissions from wetlands. Geophys. Res. Lett. 31, L21202 (2004).

    Google Scholar 

  10. Burke, E. J. et al. Quantifying uncertainties of permafrost carbon–climate feedbacks. Biogeosciences 14, 3051 (2017).

    Article  Google Scholar 

  11. McGuire, A. D. et al. Variability in the sensitivity among model simulations of permafrost and carbon dynamics in the permafrost region between 1960 and 2009. Glob. Biogeochem. Cycles 30, 1015–1037 (2016).

    Article  Google Scholar 

  12. Burke, E. J., Chadburn, S. E., Huntingford, C. & Jones, C. D. CO2 loss by permafrost thawing implies additional emissions reductions to limit warming to 1.5 or 2 °C. Environ. Res. Lett. 13, 024024 (2018).

    Article  Google Scholar 

  13. Millar, R. J. et al. Emission budgets and pathways consistent with limiting warming to 1.5 °C. Nat. Geosci. 10, 741–747 (2017).

    Article  Google Scholar 

  14. Tokarska, K. B. & Gillett, N. P. Cumulative carbon emissions budgets consistent with 1.5 °C global warming. Nat. Clim. Change 8, 296–299 (2018).

    Article  Google Scholar 

  15. Taylor, K. E., Stouffer, R. J. & Meehl, G. A. An overview of CMIP5 and the experiment design. Bull. Am. Meteorol. Soc. 93, 485–498 (2012).

    Article  Google Scholar 

  16. Schädel, C. et al. Potential carbon emissions dominated by carbon dioxide from thawed permafrost soils. Nat. Clim. Change 6, 950 (2016).

    Article  Google Scholar 

  17. Schuur, E. A. G. et al. Climate change and the permafrost carbon feedback. Nature 520, 171–179 (2015).

    Article  Google Scholar 

  18. Crill, P. M. & Thornton, B. F. Whither methane in the IPCC process? Nat. Clim. Change 7, 678 (2017).

    Article  Google Scholar 

  19. Huntingford, C. et al. Flexible parameter-sparse global temperature time profiles that stabilise at 1.5 and 2.0 °C. Earth Syst. Dynam. 8, 617–626 (2017).

    Article  Google Scholar 

  20. Best, M. et al. The Joint UK Land Environment Simulator (JULES), model description–Part 1: energy and water fluxes. Geosci. Model Dev. 4, 677–699 (2011).

    Article  Google Scholar 

  21. Clark, D. et al. The Joint UK Land Environment Simulator (JULES), model description–Part 2: carbon fluxes and vegetation dynamics. Geosci. Model Dev. 4, 701–722 (2011).

    Article  Google Scholar 

  22. Huntingford, C. & Cox, P. M. An analogue model to derive additional climate change scenarios from existing GCM simulations. Clim. Dynam. 16, 575–586 (2000).

    Article  Google Scholar 

  23. Huntingford, C. et al. IMOGEN: an intermediate complexity model to evaluate terrestrial impacts of a changing climate. Geosci. Model Dev. 3, 679–687 (2010).

    Article  Google Scholar 

  24. Chadburn, S. et al. An improved representation of physical permafrost dynamics in the JULES land-surface model. Geosci. Model Dev. 8, 1493–1508 (2015).

    Article  Google Scholar 

  25. Burke, E. J., Chadburn, S. E. & Ekici, A. A vertical representation of soil carbon in the JULES land surface scheme (vn4. 3_permafrost) with a focus on permafrost regions. Geosci. Model Dev. 10, 959–975 (2017).

    Article  Google Scholar 

  26. Morice, C. P., Kennedy, J. J., Rayner, N. A. & Jones, P. D. Quantifying uncertainties in global and regional temperature change using an ensemble of observational estimates: the HadCRUT4 data set. J. Geophys. Res. 117, D08101 (2012).

    Article  Google Scholar 

  27. Meinshausen, M. et al. The RCP greenhouse gas concentrations and their extensions from 1765 to 2300. Clim. Change 109, 213 (2011).

    Article  Google Scholar 

  28. van Vuuren, D. P. et al. Energy, land-use and greenhouse gas emissions trajectories under a green growth paradigm. Glob. Environ. Change 42, 237–250 (2017).

    Article  Google Scholar 

  29. Brown, J., Ferrians, O. Jr, Heginbottom, J. & Melnikov, E. Circum-Arctic Map of Permafrost and Ground-Ice Conditions (National Snow and Ice Data Center, 1998).

  30. Chadburn, S. E. et al. An observation-based constraint on permafrost loss as a function of global warming. Nat. Clim. Change 7, 340–344 (2017).

    Article  Google Scholar 

  31. Zhang, B. et al. Methane emissions from global wetlands: an assessment of the uncertainty associated with various wetland extent data sets. Atmos. Environ. 165, 310–321 (2017).

    Article  Google Scholar 

  32. Poulter, B. et al. Global wetland contribution to 2000–2012 atmospheric methane growth rate dynamics. Environ. Res. Lett. 12, 094013 (2017).

    Article  Google Scholar 

  33. Turetsky, M. R. et al. A synthesis of methane emissions from 71 northern, temperate, and subtropical wetlands. Glob. Change Biol. 20, 2183–2197 (2014).

    Article  Google Scholar 

  34. Saunois, M. et al. The global methane budget 2000–2012. Earth Syst. Sci. Data 8, 697–751 (2016).

    Article  Google Scholar 

  35. Jones, C. et al. The HadGEM2-ES implementation of CMIP5 centennial simulations. Geosci. Model Dev. 4, 543 (2011).

    Article  Google Scholar 

  36. Zona, D. et al. Cold season emissions dominate the Arctic tundra methane budget. Proc. Natl Acad. Sci. USA 113, 40–45 (2016).

    Article  Google Scholar 

  37. McNorton, J. et al. Role of regional wetland emissions in atmospheric methane variability. Geophys. Res. Lett. 43, 433–444 (2016).

    Article  Google Scholar 

  38. Clark, D. et al. The Joint UK Land Environment Simulator (JULES), model description–Part 2: carbon fluxes and vegetation dynamics. Geosci. Model Dev. 4, 701–722 (2011).

    Article  Google Scholar 

  39. Gedney, N. & Cox, P. M. The sensitivity of global climate model simulations to the representation of soil moisture heterogeneity. J. Hydrometeorol. 4, 1265–1275 (2003).

    Article  Google Scholar 

  40. Marthews, T., Dadson, S., Lehner, B., Abele, S. & Gedney, N. High-resolution global topographic index values for use in large-scale hydrological modelling. Hydrol. Earth Syst. Sci. 19, 91–104 (2015).

    Article  Google Scholar 

  41. Klein Goldewijk, K., Beusen, A., Van Drecht, G. & De Vos, M. The HYDE 3.1 spatially explicit database of human‐induced global land‐use change over the past 12,000 years. Glob. Ecol. Biogeogr. 20, 73–86 (2011).

    Article  Google Scholar 

  42. Sitch, S., Cox, P. M., Collins, W. J. & Huntingford, C. Indirect radiative forcing of climate change through ozone effects on the land-carbon sink. Nature 448, 791–794 (2007).

    Article  Google Scholar 

  43. Stohl, A. et al. Evaluating the climate and air quality impacts of short-lived pollutants. Atmos. Chem. Phys. 15, 10529–10566 (2015).

    Article  Google Scholar 

  44. Etminan, M., Myhre, G., Highwood, E. J. & Shine, K. P. Radiative forcing of carbon dioxide, methane, and nitrous oxide: a significant revision of the methane radiative forcing. Geophys. Res. Lett. 43, 614–623 (2016).

    Article  Google Scholar 

  45. IPCC Climate Change 2001: The Scientific Basis (eds Houghton, J. T. et al.) (Cambridge Univ. Press, 2001).

Download references

Acknowledgements

This work was undertaken as part of the UK Natural Environment Research Council’s programme ‘Understanding the Pathways to and Impacts of a 1.5 °C Rise in Global Temperature’ through grants NE/P015050/1 CLIFFTOP (to E.C.-P., G.H. and S.E.C.), NE/P014909/1, MOC1.5 (to W.J.C., C.P.W., C.H., P.M.C. and S.S.) and NE/P014941/1 CLUES (to A.B.H., P.M.C. and T.P.). The authors also acknowledge support for E.J.B. and N.G. through the Joint UK BEIS/Defra Met Office Hadley Centre Climate Programme (GA01101), E.J.B. through CRESCENDO (EU project 641816), A.B.H. through an EPSRC Fellowship ‘Negative Emissions and the Food–Energy–Water Nexus’ (EP/N030141/1), and C.H. through CEH National Capability Funding. The authors also acknowledge the wetland extent data products provided by B. Zhang of Auburn University and B. Poulter of the NASA Goddard Space Flight Center.

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G.H., E.J.B., S.E.C. and E.C.-P. conceived and developed the project. E.C.-P. and C.H. led the development of the inverse IMOGEN model system. E.J.B. and S.E.C. contributed code and expertise on permafrost and soil carbon modelling. N.G., S.E.C. and E.C.-P. contributed code and expertise on the JULES wetlands methane scheme. A.B.H. and T.P. contributed land-use change data, W.J.C. and C.P.W. ozone ancillary data and S.S. contributed expertise on the ozone damage effects, respectively. E.C.-P., C.H., G.H., E.J.B., S.E.C., W.J.C., C.P.W., P.M.C., A.B.H. and T.P. contributed to the design of the IMOGEN model runs. All authors contributed to the interpretation of the results and to the writing of the paper.

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Correspondence to Edward Comyn-Platt.

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Comyn-Platt, E., Hayman, G., Huntingford, C. et al. Carbon budgets for 1.5 and 2 °C targets lowered by natural wetland and permafrost feedbacks. Nature Geosci 11, 568–573 (2018). https://doi.org/10.1038/s41561-018-0174-9

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