Data for Figure 2.9 from Chapter 2 of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).

Figure 2.9 shows aerosol evolution from ice-core measurements. 

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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:
Gulev, S.K., P.W. Thorne, J. Ahn, F.J. Dentener, C.M. Domingues, S. Gerland, D. Gong, D.S. Kaufman, H.C. Nnamchi, J. Quaas, J.A. Rivera, S. Sathyendranath, S.L. Smith, B. Trewin, K. von Schuckmann, and R.S. Vose, 2021: Changing State of 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. 287–422, doi:10.1017/9781009157896.004.

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Figure subpanels
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The figure has four panels with data provided for panels a and b in subdirectories named panel_a and panel_b

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List of data provided
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This dataset contains:
Panel a:
- Concentration of non-sea salt sulphate (ng g-1) (10-yr averaged time series) (1750-2019).

Panel b:
- Black carbon in glacier ice form the Artic, Russia, Europe, South America, Antarctica and Greenland (10-yr averaged time series) (1700-2019).

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Data provided in relation to figure
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Panel a:

- Data file: panel_a/fig_2_9a_ice-core_data_sulfate.csv column 2, dark orange line
- Data file: panel_a/fig_2_9a_ice-core_data_sulfate.csv column 3, cyan line
- Data file: panel_a/fig_2_9a_ice-core_data_sulfate.csv column 4, blue line
- Data file: panel_a/fig_2_9a_ice-core_data_sulfate.csv column 5, light orange line
- Data file: panel_a/fig_2_9a_ice-core_data_sulfate.csv column 6, green line

Panel b:
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 2, dark orange line
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 3, light blue line
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 4, cyan line
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 5, red line
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 6, blue line
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 7, light orange line
- Data file: panel_b/fig_2_9b_ice-core_data_BC.csv column 8, green line

Units ng g-1 stands for nanogram per gram.

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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 2)
- Link to the Supplementary Material for Chapter 2, which contains details on the input data used in Table 2.SM.1
- Link to the code for the figure, archived on Zenodo.