Cited by 1,815Climate variability and modelsClimate Change Policy and EconomicsClimate Change and Environmental Impact

The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500

Open access
Meinshausen, Malte, Nicholls, Zebedee R. J., Lewis, Jared, Gidden, Matthew J., Vogel, Elisabeth, Freund, Mandy, Beyerle, Urs, Gessner, Claudia +16 more·2020·Geoscientific Model Development

Published version of a preprint

Abstract

Anthropogenic increases in atmospheric greenhouse gas concentrations are the main driver of current and future climate change. The integrated assessment community has quantified anthropogenic emissions for the shared socio-economic pathway (SSP) scenarios, each of which represents a different future socio-economic projection and political environment. Here, we provide the greenhouse gas concentrations for these SSP scenarios – using the reduced-complexity climate–carbon-cycle model MAGICC7.0. We extend historical, observationally based concentration data with SSP concentration projections from 2015 to 2500 for 43 greenhouse gases with monthly and latitudinal resolution. CO 2 concentrations by 2100 range from 393 to 1135 ppm for the lowest (SSP1-1.9) and highest (SSP5-8.5) emission scenarios, respectively. We also provide the concentration extensions beyond 2100 based on assumptions regarding the trajectories of fossil fuels and land use change emissions, net negative emissions, and the fraction of non-CO 2 emissions. By 2150, CO 2 concentrations in the lowest emission scenario are approximately 350 ppm and approximately plateau at that level until 2500, whereas the highest fossil-fuel-driven scenario projects CO 2 concentrations of 1737 ppm and reaches concentrations beyond 2000 ppm by 2250. We estimate that the share of CO 2 in the total radiative forcing contribution of all considered 43 long-lived greenhouse gases increases from 66 % for the present day to roughly 68 % to 85 % by the time of maximum forcing in the 21st century. For this estimation, we updated simple radiative forcing parameterizations that reflect the Oslo Line-By-Line model results. In comparison to the representative concentration pathways (RCPs), the five main SSPs (SSP1-1.9, SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5) are more evenly spaced and extend to lower 2100 radiative forcing and temperatures. Performing two pairs of six-member historical ensembles with CESM1.2.2, we estimate the effect on surface air temperatures of applying latitudinally and seasonally resolved GHG concentrations. We find that the ensemble differences in the March–April–May (MAM) season provide a regional warming in higher northern latitudes of up to 0.4 K over the historical period, latitudinally averaged of about 0.1 K, which we estimate to be comparable to the upper bound (∼5 % level) of natural variability. In comparison to the comparatively straight line of the last 2000 years, the greenhouse gas concentrations since the onset of the industrial period and this studies' projections over the next 100 to 500 years unequivocally depict a “hockey-stick” upwards shape. The SSP concentration time series derived in this study provide a harmonized set of input assumptions for long-term climate science analysis; they also provide an indication of the wide set of futures that societal developments and policy implementations can lead to – ranging from multiple degrees of future warming on the one side to approximately 1.5 ∘ C warming on the other.

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Crossref · 10.5194/gmd-13-3571-2020

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Authors
Meinshausen, M., Nicholls, Z. R. J., Lewis, J., Gidden, M. J., Vogel, E., Freund, M., Beyerle, U., Gessner, C., Nauels, A., Bauer, N., Canadell, J. G., Daniel, J. S., John, A., Krummel, P. B., Luderer, G., Meinshausen, N., Montzka, S. A., Rayner, P. J., Reimann, S., Smith, S. J., van den Berg, M., Velders, G. J. M., Vollmer, M. K., & Wang, R. H. J.
Affiliations
  • The University of Melbourne (AU)
  • International Institute for Applied Systems Analysis (AT)
  • Commonwealth Scientific and Industrial Research Organisation (AU)
  • ETH Zurich (CH)
  • Potsdam Institute for Climate Impact Research (DE)
  • CSIRO Oceans and Atmosphere (AU)
  • NOAA Chemical Sciences Laboratory (US)
  • National Oceanic and Atmospheric Administration (US)
  • Empa (CH)
  • Joint Global Change Research Institute (US)
  • Utrecht University (NL)
  • Georgia Institute of Technology (US)
Corresponding author
  • Meinshausen, Malte
  • Gidden, Matthew J.
  • Vogel, Elisabeth
  • Beyerle, Urs
  • Gessner, Claudia
  • Nauels, Alexander
  • Canadell, Josep G.
  • Krummel, Paul B.
  • Luderer, Gunnar
  • Montzka, Stephen A.
  • Rayner, Peter J.
  • Reimann, Stefan
  • Smith, Steven J.
  • Velders, Guus J. M.
  • Vollmer, Martin K.
  • Wang, Ray H. J.
Venue
Geoscientific Model Development
Published
2020-08-13
Volume
13
Issue
8
Pages
3571-3605
ISSN
  • 1991-959X (ISSN-L)
  • 1991-9603
OpenAlex
W3048501727
Cited by
1,815
References
78
Citations by year
2026: 288 · 2025: 412 · 2024: 396 · 2023: 336 · 2022: 241 · 2021: 107 · 2020: 33 · 2016: 2
FWCI
66.93
Type
journal article
Language
en
Open access
Locations
  • Geoscientific model development (publishedVersion, cc-by)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-sa)
  • IIASA PURE (International Institute of Applied Systems Analysis) (submittedVersion, cc-by-sa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • DORA Empa (Swiss Federal Laboratories for Materials Science and Technology (Empa)) (submittedVersion, cc-by)
  • Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
  • NOAA Institutional Repository (submittedVersion)
  • RENATE (submittedVersion, cc-by-nc-nd)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • Publication Database PIK (Potsdam Institute for Climate Impact Research (PIK)) (submittedVersion, other-oa)
  • Rivm (National Institute for Public Health and the Environment) (submittedVersion)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by)
  • Rivm (National Institute for Public Health and the Environment) (submittedVersion, other-oa)
  • RENATE (cc-by)
  • ETH Zürich Research Collection (cc-by)
Funders
Australian Research Council (FT130100809)
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 Environmental Impact
Keywords
Shared Socioeconomic Pathways, greenhouse gas concentrations, long-lived greenhouse gases, radiative forcing, fossil fuel emissions, land use change emissions, net-negative emissions, non-CO2 emissions, surface air temperature, RCP scenarios

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