Cited by 5,246Climate variability and modelsClimate Change Policy and EconomicsClimate Change and Geoengineering

The DOI matches its Crossref record; 82 of the 82 references it cites were found in a registry or an index; 12 of the 29 sources its claims cite were checked for support.

The Scenario Model Intercomparison Project (ScenarioMIP) for CMIP6

Open access
O'Neill, Brian C., Tebaldi, Claudia, van Vuuren, Detlef P., Eyring, Veronika, Friedlingstein, Pierre, Hurtt, George, Knutti, Reto, Kriegler, Elmar, Lamarque, Jean-Francois, Lowe, Jason, Meehl, Gerald A., Moss, Richard, Riahi, Keywan, Sanderson, Benjamin M.·2016·Geoscientific Model Development

Published version of a preprint

Abstract

Abstract. Projections of future climate change play a fundamental role in improving understanding of the climate system as well as characterizing societal risks and response options. The Scenario Model Intercomparison Project (ScenarioMIP) is the primary activity within Phase 6 of the Coupled Model Intercomparison Project (CMIP6) that will provide multi-model climate projections based on alternative scenarios of future emissions and land use changes produced with integrated assessment models. In this paper, we describe ScenarioMIP's objectives, experimental design, and its relation to other activities within CMIP6. The ScenarioMIP design is one component of a larger scenario process that aims to facilitate a wide range of integrated studies across the climate science, integrated assessment modeling, and impacts, adaptation, and vulnerability communities, and will form an important part of the evidence base in the forthcoming Intergovernmental Panel on Climate Change (IPCC) assessments. At the same time, it will provide the basis for investigating a number of targeted science and policy questions that are especially relevant to scenario-based analysis, including the role of specific forcings such as land use and aerosols, the effect of a peak and decline in forcing, the consequences of scenarios that limit warming to below 2 °C, the relative contributions to uncertainty from scenarios, climate models, and internal variability, and long-term climate system outcomes beyond the 21st century. To serve this wide range of scientific communities and address these questions, a design has been identified consisting of eight alternative 21st century scenarios plus one large initial condition ensemble and a set of long-term extensions, divided into two tiers defined by relative priority. Some of these scenarios will also provide a basis for variants planned to be run in other CMIP6-Endorsed MIPs to investigate questions related to specific forcings. Harmonized, spatially explicit emissions and land use scenarios generated with integrated assessment models will be provided to participating climate modeling groups by late 2016, with the climate model simulations run within the 2017–2018 time frame, and output from the climate model projections made available and analyses performed over the 2018–2020 period.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

ScenarioMIP is CMIP6’s primary scenario activity, providing multi-model climate projections driven by SSP-based emissions and land-use scenarios from integrated assessment models. It defines eight 21st-century scenarios plus a large initial-condition ensemble and long-term extensions, organized into two priority tiers.

Key findings

  • The design comprises eight alternative 21st-century scenarios plus one large initial-condition ensemble and long-term extensions, split into Tier 1 (required) and Tier 2; Tier 1 includes SSP5-8.5, SSP3-7.0, SSP2-4.5, and SSP1-2.6, while Tier 2 adds SSP4-6.0, SSP4-3.4, SSP5-3.4-OS, and SSPa-b (around or below 2.0 W m⁻²).
  • Forcing levels span updated RCPs (2.6, 4.5, 6.0, 8.5 W m⁻²) and gap scenarios (7.0, 3.4, below 2.6 W m⁻², overshoot); SSP1-2.6 is expected to produce 1.7 °C warming by 2100, and SSPa-b is designed to likely stay below 1.5 °C by 2100.
  • Statistically significant local temperature differences over more than half the land surface require at least 0.3 °C global mean temperature separation, roughly equivalent to about 0.75 W m⁻² in an idealized 1 % yr⁻¹ CO₂ increase experiment; regional precipitation requires a much wider separation.
  • Long-term extensions to 2300 include SSP5-8.5 extension equilibrating just above 12 W m⁻², SSP1-2.6 extension stabilizing around 2.0 W m⁻² and ~1.25 °C, and the overshoot extension peaking at ~2.4 °C and equilibrating at ~1.25 °C.

Methods

  • Design/protocol paper: describes ScenarioMIP objectives, experimental design, and relation to other CMIP6 activities; scenarios are selected from SSP-based IAM marker scenarios, with harmonized spatially explicit emissions and land use to be provided to climate modeling groups by late 2016 and simulations run in 2017–2018.
  • Experiments are concentration-driven for long-lived greenhouse gases, while aerosols and ozone use either ScenarioMIP emissions or CMIP-provided concentrations; output is distributed through the Earth System Grid Federation (ESGF).
  • Figures use the simple climate model MAGICC version 6.8.01 BETA to calculate concentration, forcing, and temperature outcomes; no new climate model simulations are analyzed in this paper.

Limitations

  • The paper states that IAM feasibility is not the same as real-world feasibility; not all scenarios may be equally attainable, and under limited technology availability or delayed mitigation some models find the 2.6 W m⁻² target unattainable.
  • The paper states an open question is whether different SSPs reaching the same global forcing produce different climate outcomes; if sensitivity is larger than assumed, ESM simulations specific to each SSP–forcing combination would be required. It also notes concentration-driven scenarios cannot assess amplification effects of biogeochemical feedbacks beyond the provided GHG concentrations.
  • Evident from the text: this is a design paper without a comprehensive analysis plan or results; it also notes pattern scaling and other emulators are not yet demonstrated to reliably replace climate model projections.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.5194/gmd-9-3461-2016

Cites

82 of 82 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

12 of 29 cited sources checked · 7 supported · 0 flagged · accuracy not yet measured

Show all 37 claims

  • Probably not a substantial claim. 29
  • It may state two separate claims as one. 25
43 of 43
  • The authors state this as an assumption.

    Differences in climate change projections between RCP-based and SSPx-y simulations following a similar global forcing pathway would be small enough to still warrant integration of the two sets of information into mitigation, impacts and adaptation analysis.

    “An enabling hypothesis of the parallel process is that differences in climate change projections would be small enough to still warrant integration of the two sets of information into mitigation, impacts and adaptation analysis.”
  • The authors state this as an assumption.

    Differences in climate outcomes between land use and emissions pathways that achieve the same global average radiative forcing level in 2100 but have different patterns of regional forcing are likely to be small relative to the overall uncertainty in applications of these simulations to integrated analyses (including impact assessments).

    “An assumption underlying the parallel process (Moss et al., 2010) and the SSP scenario framework is that these differences in climate outcomes are likely to be small relative to the overall uncertainty in applications of these simulations to integrated analyses (including impact assessments).”
  • The authors state this as an assumption.

    Variability estimated for one scenario can be applied to outcomes for others.

    “based on the assumption that variability estimated for one scenario can be applied to outcomes for others.”
  • The authors state this as an assumption.

    The level of negative CO2 emissions from fossil fuels reached in 2100 remains constant until 2140, and then increases linearly to reach zero by 2190.

    “The extension assumes that the level of negative CO 2 emissions from fossil fuels reached in 2100 remains constant until 2140, and then increase linearly to reach zero by 2190.”
  • The paper relies on this without support.

    Differences in climate outcomes produced by different scenarios for the same global forcing pathway are likely small relative to regional climate variability, uncertainty across climate models, and uncertainty in impact models used to investigate outcomes of interest to the IAV community.

    “The prevailing hypothesis is that differences in climate outcomes produced by different scenarios for the same global forcing pathway are likely small relative to regional climate variability, uncertainty across climate models, and uncertainty in impact models used to investigate outcomes of interest to the IAV community (see Sect. 2.4.2).”
  • The authors state this as an assumption.

    The temperature projections in Figure 3 assume zero volcanic forcing and maintain 11-year solar forcing cycles, consistent with the CMIP5 approach.

    “projections assume zero volcanic forcing and maintain 11-year solar forcing cycles, consistent with the CMIP5 approach(Meinshausen et al., 2011c).”
6 of 6

Citations

Cites

Flagged first, then by citations

Show all 72 references

Research works printed but not linked: 4

  1. IPCC: Climate Change 2001: Mitigation of Climate Change, Contribution of Working Group III to the Third Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Davidson, O. R. and Mertz, B., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2001.
  2. IPCC: Climate Change 2013: The Physical Science Basis, Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1535 pp., 2013.
  3. IPCC: Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part A: Global and Sectoral Aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Field, C. B., Barros, V. R., Dokken, D. J., Mach, K. J., Mastrandrea, M. D., Bilir, T. E., Chatterjee, M., Ebi, K. L., Estrada, Y. O., Genova, R. C., Girma, B., Kissel, E. S., Levy, A. N., MacCracken, S., Mastrandrea, P. R., and White, L. L., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1132 pp., 2014a.
  4. IPCC: Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part B: Regional Aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Barros, V. R., Field, C. B., Dokken, D. J., Mastrandrea, M. D., Mach, K. J., Bilir, T. E., Chatterjee, M., Ebi, K. L., Estrada, Y. O., Genova, R. C., Girma, B., Kissel, E. S., Levy, A. N., MacCracken, S., Mastrandrea, P. R., and White, L. L., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 688 pp., 2014b.

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Metadata

Authors
O'Neill, B. C., Tebaldi, C., van Vuuren, D. P., Eyring, V., Friedlingstein, P., Hurtt, G., Knutti, R., Kriegler, E., Lamarque, J.-F., Lowe, J., Meehl, G. A., Moss, R., Riahi, K., & Sanderson, B. M.
Affiliations
  • NSF National Center for Atmospheric Research (US)
  • Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) (DE)
  • University of Exeter (GB)
  • University of Maryland, College Park (US)
  • ETH Zurich (CH)
  • Potsdam Institute for Climate Impact Research (DE)
  • Met Office (GB)
  • Joint Global Change Research Institute (US)
  • International Institute for Applied Systems Analysis (AT)
Corresponding author
  • Tebaldi, Claudia
  • Eyring, Veronika
  • Friedlingstein, Pierre
  • Hurtt, George
  • Knutti, Reto
  • Kriegler, Elmar
  • Lowe, Jason
  • Meehl, Gerald A.
  • Moss, Richard
  • Riahi, Keywan
  • Sanderson, Benjamin M.
Venue
Geoscientific Model Development
Published
2016-09-28
Volume
9
Issue
9
Pages
3461-3482
ISSN
  • 1991-959X (ISSN-L)
  • 1991-9603
OpenAlex
W2337225114
Cited by
5,241
References
72
Citations by year
2026: 835 · 2025: 1024 · 2024: 974 · 2023: 897 · 2022: 727 · 2021: 480 · 2020: 206 · 2019: 48 · 2018: 18 · 2017: 13 · 2016: 15
FWCI
23.13
Type
journal article
Language
en
Open access
Locations
  • Geoscientific model development (publishedVersion, cc-by)
  • IIASA PURE (International Institute of Applied Systems Analysis) (acceptedVersion)
  • elib (German Aerospace Center) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
  • Figshare (submittedVersion)
  • RENATE (submittedVersion, cc-by-nc-nd)
  • Open Research Exeter (University of Exeter) (submittedVersion, cc-by)
  • Publication Database PIK (Potsdam Institute for Climate Impact Research (PIK)) (submittedVersion, other-oa)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by)
  • RENATE (cc-by)
  • ETH Zürich Research Collection (cc-by)
Funders
  • U.S. Department of Energy (DEFC0297ER62402, FC02-97ER62402)
  • European Commission (641816, HORIZON2020)
  • Office of Science (FC02-97ER62402, Cooperative Agreement DE-FC02-97ER62402, DEFC0297ER62402)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Climate Change Policy and Economics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Geoengineering
Keywords
ScenarioMIP, CMIP6, climate change projections, emission scenarios, land use change, integrated assessment models, multi-model intercomparison, scenario-based assessment, 2 °C warming limit, long-term climate projections, natural climate variability, IPCC assessment

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