Data for Figure 9.24 from Chapter 9 of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).

Figure 9.24 shows simulated CMIP6 and observed snow cover extent (SCE).

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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:
Fox-Kemper, B., H.T. Hewitt, C. Xiao, G. Aðalgeirsdóttir, S.S. Drijfhout, T.L. Edwards, N.R. Golledge, M. Hemer, R.E. Kopp, G. Krinner, A. Mix, D. Notz, S. Nowicki, I.S. Nurhati, L. Ruiz, J.-B. Sallée, A.B.A. Slangen, and Y. Yu, 2021: Ocean, Cryosphere and Sea Level Change. 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, Cambridge, United Kingdom and New York, NY, USA, pp. 1211–1362, doi:10.1017/9781009157896.011.

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Figure subpanels
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The figure has 2 subpanels, with data provided for both panels in one central directory in the GitHub repository linked in the documentation.

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List of data provided
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This dataset contains:

- (a) Simulated CMIP6 and observed (Mudryk et al., 2020) SCE (in millions of km2) for 1981–2014.
- (b) Spring (March to May) Northern Hemisphere SCE against global surface air temperature (GSAT) (relative to the 1995–2014 average) for the CMIP6 Tier 1 scenarios (SSP1-2.6, SSP2-4.5, SSP3-7.0 and SSP5-8.5), with linear regressions.

(a) Boxes and whiskers with outliers represent monthly mean values for the individual CMIP6 models averaged over 1981–2014, with the red bar indicating the median of the CMIP6 multi-model ensemble for that period. The observed interannual distribution over the period is represented in green, with the yellow bar indicating the median.

(b) Each data point is the mean for one CMIP6 simulation (first ensemble member for each available model) in the corresponding temperature bin.

Further details on data sources and processing are available in the chapter data table (Table 9.SM.9).

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Data provided in relation to figure
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Data provided in relation to Figure 9.24

- Data file: Mudryk_scf_1981-2014.txt
- Data file: snc_clim_CMIP6_historical_1981-2014.txt
- Data file: sncbin_BCC-CSM2-MR_historical_ssp126.nc
- Data file: sncbin_BCC-CSM2-MR_historical_ssp245.nc
- Data file: sncbin_BCC-CSM2-MR_historical_ssp370.nc
- Data file: sncbin_BCC-CSM2-MR_historical_ssp585.nc
- Data file: sncbin_CanESM5_historical_ssp119.nc
- Data file: sncbin_CanESM5_historical_ssp126.nc
- Data file: sncbin_CanESM5_historical_ssp245.nc
- Data file: sncbin_CanESM5_historical_ssp370.nc
- Data file: sncbin_CanESM5_historical_ssp585.nc
- Data file: sncbin_CESM2_historical_ssp126.nc
- Data file: sncbin_CESM2_historical_ssp245.nc
- Data file: sncbin_CESM2_historical_ssp370.nc
- Data file: sncbin_CESM2_historical_ssp585.nc
- Data file: sncbin_CESM2-WACCM_historical_ssp126.nc
- Data file: sncbin_CESM2-WACCM_historical_ssp245.nc
- Data file: sncbin_CESM2-WACCM_historical_ssp370.nc
- Data file: sncbin_CESM2-WACCM_historical_ssp585.nc
- Data file: sncbin_CIESM_historical_ssp126.nc
- Data file: sncbin_CIESM_historical_ssp245.nc
- Data file: sncbin_CIESM_historical_ssp585.nc
- Data file: sncbin_CMCC-CM2-SR5_historical_ssp126.nc
- Data file: sncbin_CNRM-CM6-1_historical_ssp126.nc
- Data file: sncbin_CNRM-CM6-1_historical_ssp245.nc
- Data file: sncbin_CNRM-CM6-1_historical_ssp370.nc
- Data file: sncbin_CNRM-CM6-1_historical_ssp585.nc
- Data file: sncbin_CNRM-CM6-1-HR_historical_ssp126.nc
- Data file: sncbin_CNRM-CM6-1-HR_historical_ssp245.nc
- Data file: sncbin_CNRM-CM6-1-HR_historical_ssp370.nc
- Data file: sncbin_CNRM-CM6-1-HR_historical_ssp585.nc
- Data file: sncbin_CNRM-ESM2-1_historical_ssp119.nc
- Data file: sncbin_CNRM-ESM2-1_historical_ssp126.nc
- Data file: sncbin_CNRM-ESM2-1_historical_ssp245.nc
- Data file: sncbin_CNRM-ESM2-1_historical_ssp370.nc
- Data file: sncbin_CNRM-ESM2-1_historical_ssp585.nc
- Data file: sncbin_EC-Earth3_historical_ssp126.nc
- Data file: sncbin_EC-Earth3_historical_ssp245.nc
- Data file: sncbin_EC-Earth3_historical_ssp370.nc
- Data file: sncbin_EC-Earth3_historical_ssp585.nc
- Data file: sncbin_EC-Earth3-Veg_historical_ssp126.nc
- Data file: sncbin_EC-Earth3-Veg_historical_ssp245.nc
- Data file: sncbin_EC-Earth3-Veg_historical_ssp370.nc
- Data file: sncbin_EC-Earth3-Veg_historical_ssp585.nc
- Data file: sncbin_FGOALS-f3-L_historical_ssp126.nc
- Data file: sncbin_FGOALS-f3-L_historical_ssp245.nc
- Data file: sncbin_FGOALS-f3-L_historical_ssp370.nc
- Data file: sncbin_FGOALS-f3-L_historical_ssp585.nc
- Data file: sncbin_GFDL-CM4_historical_ssp245.nc
- Data file: sncbin_GFDL-CM4_historical_ssp585.nc
- Data file: sncbin_GFDL-ESM4_historical_ssp126.nc
- Data file: sncbin_GFDL-ESM4_historical_ssp245.nc
- Data file: sncbin_GFDL-ESM4_historical_ssp370.nc
- Data file: sncbin_GFDL-ESM4_historical_ssp585.nc
- Data file: sncbin_GISS-E2-1-G_historical_ssp119.nc
- Data file: sncbin_GISS-E2-1-G_historical_ssp126.nc
- Data file: sncbin_GISS-E2-1-G_historical_ssp245.nc
- Data file: sncbin_GISS-E2-1-G_historical_ssp370.nc
- Data file: sncbin_GISS-E2-1-G_historical_ssp585.nc
- Data file: sncbin_HadGEM3-GC31-LL_historical_ssp126.nc
- Data file: sncbin_HadGEM3-GC31-LL_historical_ssp245.nc
- Data file: sncbin_HadGEM3-GC31-LL_historical_ssp585.nc
- Data file: sncbin_IPSL-CM6A-LR_historical_ssp119.nc
- Data file: sncbin_IPSL-CM6A-LR_historical_ssp126.nc
- Data file: sncbin_IPSL-CM6A-LR_historical_ssp245.nc
- Data file: sncbin_IPSL-CM6A-LR_historical_ssp370.nc
- Data file: sncbin_IPSL-CM6A-LR_historical_ssp585.nc
- Data file: sncbin_MIROC6_historical_ssp119.nc
- Data file: sncbin_MIROC6_historical_ssp126.nc
- Data file: sncbin_MIROC6_historical_ssp245.nc
- Data file: sncbin_MIROC6_historical_ssp370.nc
- Data file: sncbin_MIROC6_historical_ssp585.nc
- Data file: sncbin_MIROC-ES2L_historical_ssp119.nc
- Data file: sncbin_MIROC-ES2L_historical_ssp126.nc
- Data file: sncbin_MIROC-ES2L_historical_ssp245.nc
- Data file: sncbin_MIROC-ES2L_historical_ssp370.nc
- Data file: sncbin_MIROC-ES2L_historical_ssp585.nc
- Data file: sncbin_MPI-ESM1-2-HR_historical_ssp126.nc
- Data file: sncbin_MPI-ESM1-2-HR_historical_ssp245.nc
- Data file: sncbin_MPI-ESM1-2-HR_historical_ssp370.nc
- Data file: sncbin_MPI-ESM1-2-HR_historical_ssp585.nc
- Data file: sncbin_MRI-ESM2-0_historical_ssp119.nc
- Data file: sncbin_MRI-ESM2-0_historical_ssp126.nc
- Data file: sncbin_MRI-ESM2-0_historical_ssp245.nc
- Data file: sncbin_MRI-ESM2-0_historical_ssp370.nc
- Data file: sncbin_MRI-ESM2-0_historical_ssp585.nc
- Data file: sncbin_NorESM2-LM_historical_ssp126.nc
- Data file: sncbin_NorESM2-LM_historical_ssp245.nc
- Data file: sncbin_NorESM2-LM_historical_ssp370.nc
- Data file: sncbin_NorESM2-LM_historical_ssp585.nc
- Data file: sncbin_NorESM2-MM_historical_ssp126.nc
- Data file: sncbin_NorESM2-MM_historical_ssp245.nc
- Data file: sncbin_NorESM2-MM_historical_ssp370.nc
- Data file: sncbin_NorESM2-MM_historical_ssp585.nc
- Data file: sncbin_UKESM1-0-LL_historical_ssp119.nc
- Data file: sncbin_UKESM1-0-LL_historical_ssp126.nc
- Data file: sncbin_UKESM1-0-LL_historical_ssp245.nc
- Data file: sncbin_UKESM1-0-LL_historical_ssp370.nc
- Data file: sncbin_UKESM1-0-LL_historical_ssp585.nc

In the linked GitHub repository the filename convention differs slightly from the above, the final underscore is replaced with a '+'.
For example, 'sncbin_UKESM1-0-LL_historical_ssp585.nc' in the repository is called 'sncbin_UKESM1-0-LL_historical+ssp585.nc' in the GitHub repository.

CMIP6 is the sixth phase of the Coupled Model Intercomparison Project.
SSP stands for Shared Socioeconomic Pathway.
SSP126 is the Shared Socioeconomic Pathway which represents the lower boundary of radiative forcing and development scenarios, consistent with RCP2.6.
SSP245 is the Shared Socioeconomic Pathway which represents the median of radiative forcing and development scenarios, consistent with RCP4.5.
SSP370 is the Shared Socioeonomic Pathway which represents the upper-middle range of radiative forcing and development scenarios, consistent with RCP6.0.
SSP585 is the Shared Socioeconomic Pathway which represents the upper boundary of radiative forcing and development scenarios, consistent with RCP8.5.

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Notes on reproducing the figure from the provided data
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Panels (a) and (b) were plotted using standard Python software - code is available via the link in the documentation.

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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 figure on the IPCC AR6 website
- Link to the report component containing the figure (Chapter 9)
- Link to the Supplementary Material for Chapter 9, which contains details on the input data used in Table 9.SM.9
- Link to the data and code used to produce this figure and others in Chapter 9, archived on Zenodo.
- Link to the output data for this figure, contained in a dedicated GitHub repository. Note the difference in filenames mentioned above in the Data provided section.