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Figure 3.21 shows the seasonal evolution of observed and simulated Arctic and Antarctic sea ice area (SIA) over 1979-2017.


---------------------------------------------------
 How to cite this dataset
 ---------------------------------------------------
 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:
 Eyring, V., N.P. Gillett, K.M. Achuta Rao, R. Barimalala, M. Barreiro Parrillo, N. Bellouin, C. Cassou, P.J. Durack, Y. Kosaka, S. McGregor, S. Min, O. Morgenstern, and Y. Sun, 2021: Human Influence on the Climate System. 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. 423–552, doi:10.1017/9781009157896.005.


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 Figure subpanels
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 The figure has several subplots, but they are unidentified, so the data is stored in the parent directory.


---------------------------------------------------
 List of data provided
 ---------------------------------------------------
 This dataset contains Sea Ice Area anomalies over 1979-2017 relative to the 1979-2000 means from:
 
 - Observations (OSISAF, NASA Team, and Bootstrap)
 - Historical simulations from CMIP5 and CMIP6 multi-model means
 - Natural only simulations from CMIP5 and CMIP6 multi-model means


---------------------------------------------------
 Data provided in relation to figure
 ---------------------------------------------------
 - *_arctic_* files are used for the plots on the left side of the figure
 - *_antarctic_* files are used for the plots on the right side of the figure
 - *_OBS_NASATeam* files are used for the first row of the plot
 - *_OBS_Bootstrap* are used for the second row of the plot
 - *_OBS_OSISAF* are used for the third row of the plot
 - *_ALL_CMIP5* are used in the fourth row of the plot
 - *_ALL_CMIP6* are used in the fifth row of the plot
 - *_NAT_CMIP5* are used in the sixth row of the plot
 - *_NAT_CMIP6* are used in the seventh row of the plot

 ---------------------------------------------------
 Notes on reproducing the figure from the provided data
 ---------------------------------------------------
 The significance are for the grey dots, it's nan or 1 values. The data has to be overplotted to colored squares. Grey dots indicate multi-model mean anomalies stronger than inter-model spread (beyond ± 1 standard deviation).


The coordinates of the data are indices, but in global attributes 'comments' of each file there are relations of indices to months, since months are the y coordinate.


---------------------------------------------------
 Sources of additional information
 ---------------------------------------------------
 The following weblinks are provided in the Related Documents section of this catalogue record:
 - Link to the report component containing the figure (Chapter 3)
 - Link to the Supplementary Material for Chapter 3, which contains details on the input data used in Table 3.SM.1
 - Link to the code for the figure, archived on Zenodo.</gco:CharacterString>
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