Articles | Volume 17, issue 3
https://doi.org/10.5194/esd-17-843-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-17-843-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Jun 2026
Research article |
| 26 Jun 2026
| 26 Jun 2026
Regional impacts of irrigation on the atmospheric and terrestrial water cycle of the Iberian Peninsula in a climate model
Pierre Tiengou
CORRESPONDING AUTHOR
METIS, IPSL, Sorbonne Université/CNRS/EPHE-PSL, Paris, France
Laboratoire de Météorologie Dynamique, IPSL, Sorbonne Université/CNRS/École Normale Supérieure‐PSL Research/Ecole Polytechnique-IPP, Paris, France
Agnès Ducharne
METIS, IPSL, Sorbonne Université/CNRS/EPHE-PSL, Paris, France
Frédérique Cheruy
Laboratoire de Météorologie Dynamique, IPSL, Sorbonne Université/CNRS/École Normale Supérieure‐PSL Research/Ecole Polytechnique-IPP, Paris, France
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Gerhard Krinner, Aude Champouillon, Juliette Blanchet, and Frédérique Chéruy
Geosci. Model Dev., 19, 4961–4975, https://doi.org/10.5194/gmd-19-4961-2026, https://doi.org/10.5194/gmd-19-4961-2026, 2026
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Although the scientific community has made much progress over the last decades, climate models still do not perfectly simulate the present climate. Therefore, the model outputs are usually corrected for these errors. This article presents a method to apply successive stages of repeated error correction that lead to a better simulation of the present climate than in previous studies, in which the same correction method had been applied only once.
Eric Sauquet, Guillaume Evin, Sonia Siauve, Ryma Aissat, Patrick Arnaud, Maud Bérel, Jérémie Bonneau, Flora Branger, Yvan Caballero, François Colléoni, Agnès Ducharne, Joël Gailhard, Florence Habets, Frédéric Hendrickx, Louis Héraut, Benoît Hingray, Peng Huang, Tristan Jaouen, Alexis Jeantet, Sandra Lanini, Matthieu Le Lay, Claire Magand, Louise Mimeau, Céline Monteil, Simon Munier, Charles Perrin, Olivier Robelin, Fabienne Rousset, Jean-Michel Soubeyroux, Laurent Strohmenger, Guillaume Thirel, Flore Tocquer, Yves Tramblay, Jean-Pierre Vergnes, and Jean-Philippe Vidal
Hydrol. Earth Syst. Sci., 30, 2277–2300, https://doi.org/10.5194/hess-30-2277-2026, https://doi.org/10.5194/hess-30-2277-2026, 2026
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The Explore2 project has provided an unprecedented set of hydrological projections in terms of the number of hydrological models used and the spatial and temporal resolution. The results have been made available through various media. Under the high-emission scenario, the hydrological models mostly agree on the decrease in seasonal flows in the south of France, confirming its hotspot status, and on the decrease in summer flows throughout France, with the exception of the northern part of France.
Morgane Lalonde, Sophie Bastin, Ludovic Oudin, Pedro Felipe Arboleda-Obando, and Agnès Ducharne
EGUsphere, https://doi.org/10.5194/egusphere-2026-551, https://doi.org/10.5194/egusphere-2026-551, 2026
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Some climate models still represent cities as if they were natural ground. For one of these models, we built a new way to represent cities. The update includes how reflective surfaces are, building height, stored heat, and how much ground is sealed. The novelty is to treat sealed ground not only at the surface, but also below it. Tested at twenty urban sites, the new version better represents exchanges of energy between the ground and the air, supporting more reliable urban climate studies.
Guillaume Evin, Benoit Hingray, Guillaume Thirel, Agnès Ducharne, Laurent Strohmenger, Lola Corre, Yves Tramblay, Jean-Philippe Vidal, Jérémie Bonneau, François Colleoni, Joël Gailhard, Florence Habets, Frédéric Hendrickx, Louis Héraut, Peng Huang, Matthieu Le Lay, Claire Magand, Paola Marson, Céline Monteil, Simon Munier, Alix Reverdy, Jean-Michel Soubeyroux, Yoann Robin, Jean-Pierre Vergnes, Mathieu Vrac, and Eric Sauquet
Hydrol. Earth Syst. Sci., 30, 1023–1051, https://doi.org/10.5194/hess-30-1023-2026, https://doi.org/10.5194/hess-30-1023-2026, 2026
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Explore2 provides hydrological projections for 1,735 French catchments. Using QUALYPSO (Quasi-Ergodic Analysis of Climate Projections Using Data Augmentation), this study assesses uncertainties, including internal variability. By the end of the century, low flows are projected to decline in southern France under high emissions, while other indicators remain uncertain. Emission scenarios and regional climate models are key uncertainty sources. Internal variability is often as large as climate-driven changes.
Pedro Felipe Arboleda-Obando, Agnès Ducharne, Frédérique Cheruy, and Josefine Ghattas
Earth Syst. Dynam., 16, 2201–2223, https://doi.org/10.5194/esd-16-2201-2025, https://doi.org/10.5194/esd-16-2201-2025, 2025
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The evolution of irrigation under climate change is analyzed between 1950 and 2100. Results indicate that the influence of irrigation on evapotranspiration in irrigated areas increases in the future (compared to an historical period). Also, the effect of irrigation on water resources is also higher in the future than in the historical period. Finally, we identify areas where future hydroclimate conditions can limit irrigation, or areas where irrigation can increase tensions around water use.
Elodie Salmon, Bertrand Guenet, and Agnès Ducharne
EGUsphere, https://doi.org/10.5194/egusphere-2025-3511, https://doi.org/10.5194/egusphere-2025-3511, 2025
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Soil organic carbon stockage is a key process to mitigate climate change and is intertwined with soil temperature and moisture and of other secondary soil properties. This study shows the significance of secondary drivers in the relationship between soil moisture and microbial efficiency in soil organic carbon degradation. Using empirical relationships in a global ecosystem model enhanced significantly the heterogeneous spatial pattern of soil organic carbon stock and carbon dioxide fluxes.
Peng Huang, Agnès Ducharne, Lucia Rinchiuso, Jan Polcher, Laure Baratgin, Vladislav Bastrikov, and Eric Sauquet
Hydrol. Earth Syst. Sci., 28, 4455–4476, https://doi.org/10.5194/hess-28-4455-2024, https://doi.org/10.5194/hess-28-4455-2024, 2024
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We conducted a high-resolution hydrological simulation from 1959 to 2020 across France. We used a simple trial-and-error calibration to reduce the biases of the simulated water budget compared to observations. The selected simulation satisfactorily reproduces water fluxes, including their spatial contrasts and temporal trends. This work offers a reliable historical overview of water resources and a robust configuration for climate change impact analysis at the nationwide scale of France.
Pedro Felipe Arboleda-Obando, Agnès Ducharne, Zun Yin, and Philippe Ciais
Geosci. Model Dev., 17, 2141–2164, https://doi.org/10.5194/gmd-17-2141-2024, https://doi.org/10.5194/gmd-17-2141-2024, 2024
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We show a new irrigation scheme included in the ORCHIDEE land surface model. The new irrigation scheme restrains irrigation due to water shortage, includes water adduction, and represents environmental limits and facilities to access water, due to representing infrastructure in a simple way. Our results show that the new irrigation scheme helps simulate acceptable land surface conditions and fluxes in irrigated areas, even if there are difficulties due to shortcomings and limited information.
Mickaël Lalande, Martin Ménégoz, Gerhard Krinner, Catherine Ottlé, and Frédérique Cheruy
The Cryosphere, 17, 5095–5130, https://doi.org/10.5194/tc-17-5095-2023, https://doi.org/10.5194/tc-17-5095-2023, 2023
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This study investigates the impact of topography on snow cover parameterizations using models and observations. Parameterizations without topography-based considerations overestimate snow cover. Incorporating topography reduces snow overestimation by 5–10 % in mountains, in turn reducing cold biases. However, some biases remain, requiring further calibration and more data. Assessing snow cover parameterizations is challenging due to limited and uncertain data in mountainous regions.
Tom Gleeson, Thorsten Wagener, Petra Döll, Samuel C. Zipper, Charles West, Yoshihide Wada, Richard Taylor, Bridget Scanlon, Rafael Rosolem, Shams Rahman, Nurudeen Oshinlaja, Reed Maxwell, Min-Hui Lo, Hyungjun Kim, Mary Hill, Andreas Hartmann, Graham Fogg, James S. Famiglietti, Agnès Ducharne, Inge de Graaf, Mark Cuthbert, Laura Condon, Etienne Bresciani, and Marc F. P. Bierkens
Geosci. Model Dev., 14, 7545–7571, https://doi.org/10.5194/gmd-14-7545-2021, https://doi.org/10.5194/gmd-14-7545-2021, 2021
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Groundwater is increasingly being included in large-scale (continental to global) land surface and hydrologic simulations. However, it is challenging to evaluate these simulations because groundwater is
hiddenunderground and thus hard to measure. We suggest using multiple complementary strategies to assess the performance of a model (
model evaluation).
Axel P. Belemtougri, Agnès Ducharne, and Harouna Karambiri
Proc. IAHS, 384, 19–23, https://doi.org/10.5194/piahs-384-19-2021, https://doi.org/10.5194/piahs-384-19-2021, 2021
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Short summary
This study analyses simulations of regional climate over the Iberian Peninsula, with and without an explicit simulation of irrigation. It shows that the model matches observations much better with irrigation, particularly river discharge and evapotranspiration. The presence of simulated irrigation also makes the air cooler over irrigated areas and more humid over the whole Peninsula, leading to increases in rainfall, mostly located in the mountains that surround the highly irrigated Ebro Valley.
This study analyses simulations of regional climate over the Iberian Peninsula, with and without...
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