Input data for Figure 2.23 from Chapter 2 of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).

Figure 2.23(a) shows number of a finite selection of surveyed glaciers that advanced during the past 2000 years. Figure 2.23(b) shows the annual and decadal global glacier mass change from 1961 until 2018.

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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 two panels, with input data provided for panel b (green lines and shadow).

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List of data provided
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This dataset contains:
Global mean glacier mass balance between 2000 and 2010 and between 2010 and 2020 from Hugonnet et al. (2021).
All values are in Gt yr-1.
All uncertainties are 90% CI.

Note: two thirds of the data (the rows 2000-2010, 2010-2020) are directly available online at https://doi.org/10.6096/13 under a CC-BY-4.0 license. The last row of 2006-2019 can be derived from the data in that same DOI using provided scripts, but is not directly available in a table.

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Data provided in relation to figure
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Figure 2.23 Panel b:

- green line. table_hugonnet_regions_10yr_ar6period.xlsx. Decadal (2000-2010 and 2010-2020) global mass balance (Gt yr-1)  from Hugonnet et al. (2021). The mean values are computed in the matlab script from the value of each region.
- green area. table_hugonnet_regions_10yr_ar6period.xlsx. Decadal (2000-2010 and 2010-2020) global mass balance (Gt yr-1)  uncertainty from Hugonnet et al. (2021). The mean values are computed in the matlab script from the value of each region.

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Notes on reproducing the figure from the provided data
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Input datasets are provided and matlab scripts linked in the related Documents section to reproduce the figure.

Input dataset: table_hugonnet_regions_10yr_ar6period.xlsx and 2.23b_Zemp_etal_results_global.csv (a table already available as supplementary material by Zemp et al. (2019)). The rest of the files are provided in the corresponding code on GitHub (matlab script). The link to the code archive on Zenodo is provided in the Related Documents section of this catalogue record.

Code please be aware that you will need:
- MB_figure_FGD_chapter2_jun_28_2021.m script
- shadedplot.m matlab function
- colorscheme.mat created by the TSU of WGI

* black line. Zemp_etal_results_global.csv. Global mass change (Gt yr-1) based on spatial interpolation from 1961 to 2016; supplementary materials from Zemp et al. (2019) it is complemented with the mass change for years 2017 and 2018 from Table 1 of Zemp et al. (2020). Decadal means are computed by the matlab script.

* grey area. Zemp_etal_results_global.csv. Total uncertainty of regional mass change (Gt yr-1) from 1961 to 2016; supplementary materials from Zemp et al. (2019) it is complemented with the uncertainty of mass change for years 2017 and 2018 from Table 1 of Zemp et al. (2020). Decadal uncertainties are computed by the matlab script.

* blue line. Global mean glacier mass balance (Gt yr-1) between 2002 and 2016 from Wouters et al. (2019). Values are taken from Table 1 of Wouters et al. (2019) Global total of glacier mass budget. Values are declared in the matlab script.

* light blue area. Global mean glacier mass balance uncertainty (Gt yr-1) between 2002 and 2016 from Wouters et al. (2019). Values are taken from Table 1 of Wouters et al. (2019) Global total of glacier mass budget uncertainty. Values are declared in the matlab script.

* desert yellow line. Global mean glacier mass balance (Gt yr-1) between 2006 and 2015 from Hock et al. (2019) Values are taken from Table 2A.1 of Chapter 2 of SROCC Global values. Values are declared in the matlab script.

* desert yellow area. Global mean glacier mass balance uncertainty (Gt yr-1) between 2006 and 2015 from Hock et al. (2019) Values are taken from Table 2A.1 of Chapter 2 of SROCC Global values. Values are declared in the matlab script.

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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.