The worldwide C3S CORDEX grand ensemble: A major contribution to assess regional climate change in the IPCC AR6 Atlas

The collaboration between the Coordinated Regional Climate Downscaling Experiment (CORDEX) and the Earth System Grid Federation (ESGF) provides open access to an unprecedented ensemble of regional climate model (RCM) simulations, across the 14 CORDEX continental-scale domains, with global coverage. These simulations have been used as a new line of evidence to assess regional climate projections in the latest contribution of the Working Group I (WGI) to the IPCC Sixth Assessment Report (AR6), particularly in the regional chapters and the Atlas. Here, we present the work done in the framework of the Copernicus Climate Change Service (C3S) to assemble a consistent worldwide CORDEX grand ensemble, aligned with the deadlines and activities of IPCC AR6. This work addressed the uneven and heterogeneous availability of CORDEX ESGF data by supporting publication in CORDEX domains with few archived simulations and performing quality control. It also addressed the lack of comprehensive documentation by compiling information from all contributing regional models, allowing for an informed use of data. In addition to presenting the worldwide CORDEX dataset, we assess here its consistency for precipitation and temperature by comparing climate change signals in regions with overlapping CORDEX domains, obtaining overall coincident regional climate change signals. The C3S CORDEX dataset has been used for the assessment of regional climate change in the IPCC AR6 (and for the interactive Atlas) and is available through the Copernicus Climate Data Store (CDS).

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Author Diez-Sierra, Javier
Iturbide, Maialen
Gutiérrez, José M.
Fernández, Jesús
Milovac, Josipa
Cofiño, Antonio S.
Cimadevilla, Ezequiel
Nikulin, Grigory
Levavasseur, Guillaume
Kjellström, Erik
Bülow, Katharina
Horányi, András
Brookshaw, Anca
García-Díez, Markel
Pérez, Antonio
Baño-Medina, Jorge
Ahrens, Bodo
Alias, Antoinette
Ashfaq, Moetasim
Bukovsky, Melissa
Buonomo, Erasmo
Caluwaerts, Steven
Chan Chou, Sin
Christensen, Ole B.
Ciarlo´, James M.
Coppola, Erika
Corre, Lola
Demory, Marie-Estelle
Djurdjevic, Vladimir
Evans, Jason P.
Fealy, Rowan
Feldmann, Hendrik
Jacob, Daniela
Jayanarayanan, Sanjay
Katzfey, Jack
Keuler, Klaus
Kittel, Christoph
Levent Kurnaz, Mehmet
Laprise, René
Lionello, Piero
McGinnis, Seth
Mercogliano, Paola
Nabat, Pierre
Önol, Bariş
Ozturk, Tugba
Panitz, Hans-Jürgen
Paquin, Dominique
Pieczka, Ildikó
Raffaele, Francesca
Reca Remedio, Armelle
Scinocca, John
Sevault, Florence
Somot, Samuel
Steger, Christian
Tangang, Fredolin
Teichmann, Claas
Termonia, Piet
Thatcher, Marcus
Torma, Csaba
van Meijgaard, Erik
Vautard, Robert
Warrach-Sagi, Kirsten
Winger, Katja
Zittis, George
Publisher UCAR/NCAR - Library
Publication Date 2022-12-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:41:36.149348
Metadata Record Identifier edu.ucar.opensky::articles:25907
Metadata Language eng; USA
Suggested Citation Diez-Sierra, Javier, Iturbide, Maialen, Gutiérrez, José M., Fernández, Jesús, Milovac, Josipa, Cofiño, Antonio S., Cimadevilla, Ezequiel, Nikulin, Grigory, Levavasseur, Guillaume, Kjellström, Erik, Bülow, Katharina, Horányi, András, Brookshaw, Anca, García-Díez, Markel, Pérez, Antonio, Baño-Medina, Jorge, Ahrens, Bodo, Alias, Antoinette, Ashfaq, Moetasim, Bukovsky, Melissa, Buonomo, Erasmo, Caluwaerts, Steven, Chan Chou, Sin, Christensen, Ole B., Ciarlo´, James M., Coppola, Erika, Corre, Lola, Demory, Marie-Estelle, Djurdjevic, Vladimir, Evans, Jason P., Fealy, Rowan, Feldmann, Hendrik, Jacob, Daniela, Jayanarayanan, Sanjay, Katzfey, Jack, Keuler, Klaus, Kittel, Christoph, Levent Kurnaz, Mehmet, Laprise, René, Lionello, Piero, McGinnis, Seth, Mercogliano, Paola, Nabat, Pierre, Önol, Bariş, Ozturk, Tugba, Panitz, Hans-Jürgen, Paquin, Dominique, Pieczka, Ildikó, Raffaele, Francesca, Reca Remedio, Armelle, Scinocca, John, Sevault, Florence, Somot, Samuel, Steger, Christian, Tangang, Fredolin, Teichmann, Claas, Termonia, Piet, Thatcher, Marcus, Torma, Csaba, van Meijgaard, Erik, Vautard, Robert, Warrach-Sagi, Kirsten, Winger, Katja, Zittis, George. (2022). The worldwide C3S CORDEX grand ensemble: A major contribution to assess regional climate change in the IPCC AR6 Atlas. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7nv9p3p. Accessed 19 June 2025.

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