Data for Figure 9.14 from Chapter 9 of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).

Figure 9.14 shows monthly mean March and September sea ice area as a function of global surface air temperature (GSAT) anomaly; cumulative anthropogenic CO2 emissions; year in CMIP6 model simulations and in observations.

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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 8 subpanels, with data provided for all panels.

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List of data provided
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This dataset contains:

- (a) Monthly mean March sea ice area as a function of global surface air temperature (GSAT) anomaly.
- (b) Monthly mean March sea ice area as a function of cumulative anthropogenic CO2 emissions.
- (c) Monthly mean March sea ice area as a function of year in CMIP6 model simulations and observations.
- (d) Sensitivity of March sea ice loss to anthropogenic CO2 emissions as a function of modelled sensitivity of GSAT to anthropogenic CO2 emissions.
- (e) Monthly mean September sea ice area as a function of global surface air temperature (GSAT) anomaly.
- (f) Monthly mean September sea ice area as a function of cumulative anthropogenic CO2 emissions.
- (g) Monthly mean September sea ice area as a function of year in CMIP6 model simulations and observations
- (h) Sensitivity of September sea ice loss to anthropogenic CO2 emissions as a function of modelled sensitivity of GSAT to anthropogenic CO2 emissions.

CO2 emissions are shown as CMIP6 model simulations (shading, ensemble mean as bold line) and observations (black dots).

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Data provided in relation to figure
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Data provided in relation to Figure 9.14

- Data file: CMIP3_sensitivity_nh.nc
- Data file: CMIP5_sensitivity_nh.nc
- Data file: CMIP6_historical_nh.nc
- Data file: CMIP6_sensitivity_nh.nc
- Data file: CMIP6_ssp119_nh.nc
- Data file: CMIP6_ssp126_nh.nc
- Data file: CMIP6_ssp245_nh.nc
- Data file: CMIP6_ssp585_nh.nc
- Data file: CO2_CMIP6.nc
- Data file: IPCC_GSAT.csv: Provisional time series for use in GSAT calculations.
- Data file: SeaIceArea__NorthernHemisphere__monthly__UHH__v2019_fv0.01.nc
- Data file: SeaIceArea__SouthernHemisphere__monthly__UHH__v2019_fv0.01.nc
- Data file: obs_sensitivity_nh.nc

CMIP3 is the third phase of the Coupled Model Intercomparison Project.
CMIP5 is the fifth phase of Coupled Model Intercomparison Project.
CMIP6 is the sixth phase of the Coupled Model Intercomparison Project.
GSAT stands for Global Surface Air Temperature.
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.
SSP585 is the Shared Socioeconomic Pathway which represents the upper boundary of radiative forcing and development scenarios, consistent with RCP8.5.
UHH is the University of Hamburg (Universität Hamburg).

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Notes on reproducing the figure from the provided data
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Sections of the figure in the report were plotted using standard matplotlib software - code is available via the link in the documentation. Some data has been converted to net-CDF format for archival, original .mat files used in the plotting script are archived on Zenodo at the link provided in the Related Document section of this catalogue record.

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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.