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Chapter 3 of the Working Group I Contribution to the IPCC Sixth Assessment Report - Input data for Figure 3.27 (v20220621)

Update Frequency: Not Planned
Latest Data Update: 2022-07-05
Status: Ongoing
Online Status: ONLINE
Publication State: Citable
Publication Date: 2022-12-14
DOI Publication Date: 2023-02-08
Download Stats: last 12 months
Dataset Size: 3 Files | 38MB


Input data for figure 3.27 from Chapter 3 of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6).

Figure 3.27 shows maps of multi-decadal salinity trends for the near-surface ocean.

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.

Figure subpanels
The figure has two subpanels, with input data provided for the upper panel.

List of data provided
This dataset contains the global ocean salinity estimates from Durack & Wijffels (2010) based on observations from 01-01-1950 to 12-31-2019:

- Mean salinity (for the Jan/1950 to Dec/2019 period, units in PSS).
- Salinity change (for the same period, PSS/70-years).
- Salinity change error (same period, PSS/70-years).

Notes on reproducing the figure from the provided data
The observational data from here (top panel) is taken from the file: The fields of interest are salinity_mean (shown as black contours) and salinity_change (shown in colourscale). is an updated file from Durack & Wijffels (2010).

The data file is an intermediate file used in 3.27, please refer to the code to generate the figure using the corresponding tools (see the link to the code in the 'Related document' section at main ESMValGroup/ESMValTool-AR6-OriginalCode-FinalFigures).

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 code for the figure, archived on Zenodo.
- Link to input data figure 2.27.
- Link to the figure on the IPCC AR6 website.

Citable as:  Durack, P.J. (2023): Chapter 3 of the Working Group I Contribution to the IPCC Sixth Assessment Report - Input data for Figure 3.27 (v20220621). NERC EDS Centre for Environmental Data Analysis, 08 February 2023. doi:10.5285/38bac9051d064d4da183fff2361f5de8.
Abbreviation: Not defined
Keywords: IPCC-DDC, IPCC, AR6, WG1, WGI, Sixth Assessment Report, Working Group I, Physical Science Basis, Chapter 3, Human influence, large-scale indicators, Natural variability, anthropogenically-forced change, observed changes


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data produced by Intergovernmental Panel on Climate Change (IPCC) authors and supplied for archiving at the Centre for Environmental Data Analysis (CEDA) by the Technical Support Unit (TSU) for IPCC Working Group I (WGI).
Data curated on behalf of the IPCC Data Distribution Centre (IPCC-DDC).

Data Quality:
Data as provided by the IPCC
File Format:

Process overview

This dataset was generated by the computation detailed below.

Caption for Figure 3.27 from Chapter 3 of the Working Group I (WGI) Contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (AR6)


Maps of multi-decadal salinity trends for the near-surface ocean. Units are Practical Salinity Scale 1978 [PSS-78] decade-1. (top) The best estimate (Section observed trend (Durack and Wijffels, 2010–. (bottom) Simulated trend from the CMIP6 historical experiment multi-model mean (1950-–2014). Black contours show the climatological mean salinity in increments of 0.5 PSS-78 (thick lines 1 PSS-78). Further details on data sources and processing are available in the chapter data table (Table 3.SM.1).

Input Description


Output Description


Software Reference


  • long_name: Potential Temperature change 19500101-20191231
  • standard_name: change_over_time_in_sea_water_potential_temperature
  • var_id: thetao_change
  • names: Potential Temperature change 19500101-20191231, change_over_time_in_sea_water_potential_temperature
  • long_name: Potential Temperature change error 19500101-20191231
  • var_id: thetao_change_error
  • names: Potential Temperature change error 19500101-20191231
  • standard_name: sea_water_potential_temperature
  • units: degree_C
  • long_name: Potential Temperature mean 19500101-20191231
  • var_id: thetao_mean
  • names: sea_water_potential_temperature, Potential Temperature mean 19500101-20191231
  • long_name: Salinity change 19500101-20191231
  • standard_name: change_over_time_in_sea_water_salinity
  • var_id: salinity_change
  • names: Salinity change 19500101-20191231, change_over_time_in_sea_water_salinity
  • long_name: Salinity change error 19500101-20191231
  • var_id: salinity_change_error
  • names: Salinity change error 19500101-20191231
  • standard_name: sea_water_salinity
  • units: 1e-3
  • long_name: Salinity mean 19500101-20191231
  • var_id: salinity_mean
  • names: sea_water_salinity, Salinity mean 19500101-20191231
  • var_id: depth_bnds
  • var_id: latitude_bnds
  • var_id: longitude_bnds
  • var_id: depth
  • long_name: sea_water_pressure
  • standard_name: sea_water_pressure
  • units: decibar
  • names: sea_water_pressure, sea water pressure
  • var_id: time_climatology

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: latitude
  • long_name: latitude
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • var_id: longitude
  • long_name: longitude
  • names: longitude
  • long_name: time
  • standard_name: time
  • var_id: time
  • names: time
Temporal Range
Start time:
End time:
Geographic Extent

Related parties
Authors (1)