Dataset
Summary for Policymakers of the Working Group I Contribution to the IPCC Sixth Assessment Report - data for Figure SPM.1 (v20210809)
Abstract
Data for Figure SPM.1 from the Summary for Policymakers (SPM) of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).
Figure SPM.1 shows global temperature history and causes of recent warming.
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How to cite this dataset
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When citing this dataset, please include both the data citation below (under 'Citable as') and the following citation for the report component from which the figure originates:
IPCC, 2021: Summary for Policymakers. In: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S. L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu and B. Zhou (eds.)]. Cambridge University Press. In Press.
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Figure subpanels
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The figure has two panels, with data provided for all panels in subdirectories named panel_a and panel_b.
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List of data provided
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Panel a
The dataset contains:
- Estimated temperature during the warmest multi-century period in at least the last 100,000 years, which occurred around 6500 years ago (4500 BCE), multi-centennial average, from AR6 WGI Chapter 2
- Global surface temperature change time series relative to 1850-1900 for 1-2020 from:
• 1-2000 CE reconstruction from paleoclimate archives, decadal smoothed, from PAGES2k Consortium (2019, DOI: 10.1038/s41561-019-0400-0)
• 1850-2020 CE, observations, decadal smoothed, from AR6 WGI Chapter 2 assessed mean
Panel b:
The dataset contains global surface temperature change time series relative to 1850-1900 for 1850-2020 from simulations from the sixth phase of the Coupled Model Intercomparison Project (CMIP6) and observations:
- CMIP6 historical+ssp245 simulations (simulations with human and natural forcing, 1850-2019)
- CMIP6 hist-nat simulations (simulations with natural forcing, 1850-2019)
- Global Surface Temperature Anomalies (GSTA) relative to 1850-1900 from observations assessed in IPCC AR6 WG1 Chapter 2 (1850-2020)
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Data provided in relation to figure
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Panel a:
- panel_a/SPM1_1-2000_recon.txt, 1-2000 time series, decadal smoothed, for years centered on 5-1996 CE [column 1 grey line, columns 2 and 3 grey shading]
- panel_a/SPM1_1850-2020_obs.txt, 1850-2020 time series, decadal smoothed, for years centered on 1855-2016 CE [black line]
- panel_a/SPM1_6500_recon.txt, bar for the warmest multi-century period in more than 100,000 years (around 6500 years ago: 4500 BCE) [grey bar]
Panel b:
- panel_b/gmst_changes_model_and_obs.csv. Global surface temperature change time series relative to 1850-1900 for 1850-2020 from:
• CMIP6 historical+ssp245 simulations (1850-2019) [mean, brown line]
• CMIP6 historical+ssp245 simulations (1850-2019) [5% range, brown shading, bottom]
• CMIP6 historical+ssp245 simulations (1850-2019) [95% range, brown shading, top]
• CMIP6 hist-nat simulations (1850-2019) [mean, green line]
• CMIP6 hist-nat simulations (1850-2019) [5% range, green shading, bottom]
• CMIP6 hist-nat simulations (1850-2019) [95% range, green shading, top]
• Global Surface Temperature Anomalies (GSTA) relative to 1850-1900 from observations assessed in IPCC AR6 WG1 Chapter 2 (1850-2020) [black line]
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Sources of additional information
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The following weblinks are provided in the Related Documents section of this catalogue record:
- Link to the report webpage, which includes the report component containing the figure (Summary for Policymakers), the Technical Summary (Cross-Section Box TS.1, Figure 1a) and the Supplementary Material for Chapters 2 and 3, which contains details on the input data used in Tables 2.SM.1 (Figure 2.11a) and 3.SM.1 (Figure 3.2c; FAQ 3.1, Figure 1).
- Link to related publication for input data
Details
| Previous Info: |
No news update for this record
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| Previously used record identifiers: |
No related previous identifiers.
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| Access rules: |
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: http://creativecommons.org/licenses/by/4.0/. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
| Data lineage: |
Data produced by Intergovernmental Panel on Climate Change (IPCC) authors and supplied for archiving at the Centre for Environmental Data Analysis (CEDA) by the Technical Support Unit (TSU) for IPCC Working Group I (WGI). |
| File Format: |
Data are CSV formatted.
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Related Documents
Citations: 2
The following citations have been automatically harvested from external sources associated with this resource where DOI tracking is possible. As such some citations may be missing from this list whilst others may not be accurate. Please contact the helpdesk to raise any issues to help refine these citation trackings.
| Kaufman, D. S., & McKay, N. P. (2022). Technical Note: Past and future warming â direct comparison on multi-century timescales. Climate of the Past, 18(4), 911â917. https://doi.org/10.5194/cp-18-911-2022 |
| Wang, J., & Wang, A. (2023). Statistical and Thermal Processes. Synthesis Lectures on Computation and Analytics, 175â201. https://doi.org/10.1007/978-3-031-17646-3_8 |
Process overview
| Title | Caption for Figure SPM.1 from the Summary for Policymakers of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6) |
| Abstract | History of global temperature change and causes of recent warming Panel a): Changes in global surface temperature reconstructed from paleoclimate archives (solid grey line, 1–2000) and from direct observations (solid black line, 1850–2020), both relative to 1850–1900 and decadally averaged. The vertical bar on the left shows the estimated temperature (very likely range) during the warmest multi-century period in at least the last 100,000 years, which occurred around 6500 years ago during the current interglacial period (Holocene). The Last Interglacial, around 125,000 years ago, is the next most recent candidate for a period of higher temperature. These past warm periods were caused by slow (multi-millennial) orbital variations. The grey shading with white diagonal lines shows the very likely ranges for the temperature reconstructions. Panel b): Changes in global surface temperature over the past 170 years (black line) relative to 1850–1900 and annually averaged, compared to CMIP6 climate model simulations (see Box SPM.1) of the temperature response to both human and natural drivers (brown), and to only natural drivers (solar and volcanic activity, green). Solid coloured lines show the multi-model average, and coloured shades show the very likely range of simulations. (see Figure SPM.2 for the assessed contributions to warming). {2.3.1, 3.3, Cross-Chapter Box 2.3, Cross-Section Box TS.1, Figure 1a, TS.2.2} |
| Input Description | None |
| Output Description | None |
| Software Reference | None |
- long_name: Year
- units: Year
- names: Year
- units: Degrees C
- long_name: gsta_black_obs
- names: gsta_black_obs
- units: Degrees C
- long_name: gsta_brown_line_hist_ssp245
- names: gsta_brown_line_hist_ssp245
- units: Degrees C
- long_name: gsta_brown_shading_bottom_hist_ssp245
- names: gsta_brown_shading_bottom_hist_ssp245
- units: Degrees C
- long_name: gsta_brown_shading_top_hist_ssp245
- names: gsta_brown_shading_top_hist_ssp245
- units: Degrees C
- long_name: gsta_green_line_hist_nat
- names: gsta_green_line_hist_nat
- units: Degrees C
- long_name: gsta_green_shading_bottom_hist_nat
- names: gsta_green_shading_bottom_hist_nat
- units: Degrees C
- long_name: gsta_green_shading_top_hist_nat
- names: gsta_green_shading_top_hist_nat
Co-ordinate Variables
Temporal Range
0001-01-01T00:00:00
2019-12-31T23:59:59
Geographic Extent
90.0000° |
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-180.0000° |
180.0000° |
|
-90.0000° |