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Introduction 

A new Climate Data Store (CDS) and a new Atmosphere Data Store (ADS) powered by a new state-of-the-art infrastructure, referred to as the Common Data Store (CDS) Engine, are soon to be launched. 

All layers of the CDS an ADS infrastructure are being modernised: the front-end web interface, the back-end software engine and the underlying cloud infrastructure hosting the service and core data repositories. 

What does this mean in practice to current CDS and ADS users?

User account:

ECMWF Single Sign-On (SSO) has been extended to all its platforms including the new CDS and ADS. SSO allows users to have access to multiple applications by signing in with only one account. It also has other important features in regard to simple management, security, ease of use, and seamlessness.

All users of the new CDS and new ADS will need an ECMWF account. If you already have one, great. If you do not yet have an ECMWF account, you may already please register with ECMWF to get one. 

As a consequence of the single sign-on implementation, your current CDS or ADS login credentials will not work on the new CDS or ADS infrastructure, regardless of whether you are currently using the CDS or ADS interactively (e.g. over the web interface) or programmatically (using the API service). A new UserID (ECMWF) and API key will be needed.Additional details soon to be provided

CDS/ADS Catalogue - data download over web interface: 

• Before downloading any data from the new CDS or ADS infrastructure, users will have to accept datasets terms and conditions on the new system. Users' profiles including licensing information are not being transferred. In practical terms, this means for example that if you are downloading ERA5 data (web or API) from the current CDS, you will need to login to the new CDS and accept the terms and conditions for ERA5 (i.e. Licence to use Copernicus Products).

API Service - programmatic way of downloading data: 

• A new version of the cdsapi  cdsapi package has been released. API users need to upgrade their CDS API (i.e pip install --upgrade cdsapi). Note that the new version of the cdsapi package works on both the current and new CDS. 
• When CDS-beta is open, login to the CDS-beta interface using your ECMWF account and follow the instructions online. Make sure you also accept the Terms and Conditions of the datasets you wish to download (see CDS/ADS Catalogue section above).
• You will need to update your .cdsapirc file with the new URL and your new credentials (key, URL) to be able to download data from the new CDS.from CDS-beta. You will be able to see this from the API page (accessible from the CDS-beta homepage).
• Before running your API script to fetch data from CDS-betaCDS API syntax is changed and some keys or parameter names may have also changed. To avoid requests failing, please use the "Show API request code" tool on the dataset Download Form on CDS-beta to check you are using the correct syntax for your API request. CDS API syntax is changed and some keys or parameter names may have also changed. 

CDS Toolbox, Viewers and Applications:

The CDS Toolbox will be discontinued and is not migrated to the new CDS infrastructure. Support will continue to be provided to CDS Toolbox users until the CDS Toolbox is shutdown in September 2024. ECMWF Support will however not be able to help with supporting users migrating their CDS Toolbox workflows on to another programming language/software. 

As a consequence of the CDS Toolbox being discontinued, the Viewer tool for the following datasets in the CDS will also be discontinued. 

New tool packages will be made available (post new CDS launch) to provide software tools for weather and climate workflows that simplify data access, analysis, visualisation and much more. Please watch the user forum for announcements on this topic in the next coming months.

All Climate Data Store Applications will also be retired and no longer available when the current Climate Data Store is shutdown in September 2024.

Feedback and reporting bugs/issues:

Please send your feedback and/or report any issue/bug you may have encountered while using the new CDS and ADS infrastructure by raising an enquiry ticket through our dedicated  Support Portal (ECMWF login required) - make sure you select "Yes" to the question Is this request related to CDS-beta/ADS-beta/CEMS-EW-beta? on the Support Portal request form - this will help the Support team with triaging enquiries more efficiently.

Good to know

• Data holdings on the current CDS and ADS will no longer be updated a couple of month following the launch of the new CDS/ADS infrastructure.
• New publication of datasets (including publication of existing dataset new versions) will only be made in the new CDS/ADS infrastructure. Users are therefore urged to migrate over to the new CDS/ADS infrastructure as soon as possible.
• Some observation datasets will not be immediately available to download from the new CDS infrastructure while technical issues with these particular datasets are being addressed.

• Expand

  In situ temperature, relative humidity and wind profiles from 2006 to March 2020 from the GRUAN reference network In situ total column ozone and ozone soundings from 1924 to present from the World Ozone and Ultraviolet Radiation Data Centre In situ observations of meteorological variables from the Integrated Global Radiosounding Archive and the Radiosounding Harmonization dataset from 1978 onward In-situ observations of water vapour and atmospheric delay from the ground-based GNSS network from 1996 to present

• Some unsupported datasets in current CDS will be deprecated in the new CDS infrastructure. 

• Expand

  Arctic route availability and cost projection derived from climate projections of ice concentration and thickness Ship performance along standard shipping routes derived from reanalysis and seasonal forecasts Water level change time series for the European coast from 1977 to 2100 derived from climate projections Water level change indicators for the European coast from 1977 to 2100 derived from climate projections Performance indicators for offshore wind farms in Europe from 1977 to 2100 derived from climate projections Soil erosion indicators for Italy from 1981 to 2080 Flood risk indicators for European cities from 1989 to 2018 Water sector indicators of hydrological change across Europe from 2011 to 2095 derived from climate simulations Ocean fronts data for the Northwest European Shelf and Mediterranean Sea from 1991 up to 2100 Eutrophication indicators for the Northwest European Shelf and Mediterranean Sea from 2006 up to 2100 Fish abundance and catch data for the Northwest European Shelf and Mediterranean Sea from 2006 to 2098 derived from climate projections Climate suitability indicators for tourism from 1970 to 2100 over Europe derived from climate projections Climate variables for cities in Europe from 2008 to 2017 Sea level daily gridded data from satellite observations for the Mediterranean Sea from 1993 to 2020  Sea level daily gridded data from satellite observations for the Black Sea from 1993 to 2020

• For the time being, DOIs of datasets in CDS-Beta will point to the same datasets in current CDS until current CDS is shutdown in September 2024.
• The current CDS and ADS will be be completely shutdown in September 2024. Please migrate to using the new CDS/ADS by September 3rd, 2024. Should users still have API scripts pointing to the retired CDS and ADS systems, these will systematically break and no support will be provided. 

_{This document has been produced in the context of the Copernicus Atmosphere Monitoring Service (CAMS) and Copernicus Climate Change Service (C3S).}

_{The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of CAMS and C3S on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose.}

 _{The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view.}

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