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This document provides a description of the CDR dataset provided by the C3S Glacier Change Service to the Climate Data Store (CDS). The Glacier Change Service addresses the essential climate variable (ECV) Glacier and provides a globally gridded product of annual mass changes with a spatial resolution of 0.5° x 0.5° covering the hydrological years from 1975/76 to 2021/22. The product was computed by combining the temporal variability from glaciological in-situ observations with multiannual to decadal trends from air- and spaceborne geodetic observation. As input data, our product builds on both glaciological and geodetic time series from individual glaciers as available from the latest version of the Fluctuations of Glaciers (FoG, WGMS, 2023) database of the World Glacier Monitoring Service (WGMS; https://wgms.ch). As auxiliary data, glacier area is used from the Randolph Glacier Inventory (RGI, version 6.0; RGI 2017) which is available from the CDS as brokered product (RD1, https://cds.climate.copernicus.eu/cdsapp#!datasets/dataset/insitu-glaciers-extent?tab=overview).
In the present document, we provide a brief summary on the background of our data product in Section 1.1, followed by target requirements, product description and data usage information in Section 1.2. Information on data access is provided in Section 2.
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Glacier data will be made available through the Copernicus Climate Data Store (CDS) web-based service, which is the sole data distributor (https://cds.climate.copernicus.eu/cdsapp#!/home). A free of charge registration is required to access the CDS and all its toolbox software. Data can be downloaded directly from the website and used under the License to Use Copernicus Products (also included on download page). Data may also be viewed directly online. All requests for information or further data should be channeled through the CDS Knowledge Base at https://confluence.ecmwf.int//display/CKB/.
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Previous C3S glacier change products (versions 1 to 6) were provided to the CDS as two separate datasets of glacier elevation and mass change time series as extracts from the Fluctuations of Glaciers (FoG) database brokered from the WGMS. These former datasets are still accessible within the C3S download package under a separate CDS catalogue entry and described in the related documentation provided. They can also be found on the WGMS website (https://wgms.ch/data_databaseversions/) in their original form.
The current C3S product version WGMS-FOG-2023-09 represents a global gridded annual glacier mass-change product that builds on the latest updated version of the Fluctuations of Glaciers Database. The present FoG database version (WGMS, 2023) is available for download from the WGMS website (https://wgms.ch/data_databaseversions/). We note that only the FoG database versions up to 202008 are provided via CDS catalogue entry and the newer versions will no longer be provided. A generalized overview on the available datasets is also possible using the GTN-G browser that can be found at https://www.gtn-g.ch/data_browser. For questions regarding the FoG or any other GTN-G dataset, please contact the WGMS staff via wgms@geo.uzh.ch.
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