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              <p>The Albedo-Prairies project measured albedo dynamics from 2021 to 2023 for 7 temporary or permanent grasslands scattered across mainland France. The results show that the albedo of grasslands is higher between autumn and spring and lower in summer. It can be less or more reduced by grazing intensity and even more so by mowing the grass. Drought accentuates more the fall in albedo in summer. The albedo measured on the ground of these grasslands can be used to calculate a negative radiative forcing of -6.8 W/m² compared with winter wheat. This means that grasslands have a cooling effect on the climate. Satellite measurements confirm the albedo trends measured on the ground by providing extensive coverage at the scale of the territory, which is the relevant landscape unit for land management and for assessing the regional climatic impact. The grassland albedo is a promising lever for mitigating climate change, at a similar level as soil carbon storage and reduction of greenhouse gases (GHG) emissions.</p>
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              <p>Le projet Albédo-Prairies a mesuré de 2021 à 2023, la dynamique saisonnière de l'albédo (α) pour 7 prairies françaises, démontrant que l'albédo des prairies est plus élevé en automne qu'au printemps et plus faible en été. Il est réduit par l'intensité du pâturage et plus encore par la fauche. La sécheresse accentue la baisse d'α. L'albédo sert à calculer le forçage radiatif, négatif de -6,8 W/m² pour une prairie par rapport à un blé d'hiver, ce qui traduit le fait que les prairies ont un effet refroidissant sur le climat. Les mesures satellitaires confirment les tendances in situ d'albédo et fournissent une couverture étendue à l'échelle du territoire, qui est l'unité du paysage pertinente pour la gestion des terres et aussi pour juger de l'impact climatique régional. La mobilisation de l'albédo des prairies est un levier très prometteur visà-vis de l'atténuation du changement climatique et se situe en termes d'impact au même niveau que le stockage de carbone dans le sol et la réduction des émissions des gaz à effet de serre (GES).</p>
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