About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects
Today societies face an unprecedented challenge to limit global warming and restore agricultural soils. Recent studies show that the introduction of cover crops over Europe could result in a cooling impact due to an increase in soil organic carbon stocks, a decrease in the use of fertilizers, and an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/13/3231 |
| _version_ | 1827734645573156864 |
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| author | Gaétan Pique Dominique Carrer Emanuele Lugato Rémy Fieuzal Raphaël Garisoain Eric Ceschia |
| author_facet | Gaétan Pique Dominique Carrer Emanuele Lugato Rémy Fieuzal Raphaël Garisoain Eric Ceschia |
| author_sort | Gaétan Pique |
| collection | DOAJ |
| description | Today societies face an unprecedented challenge to limit global warming and restore agricultural soils. Recent studies show that the introduction of cover crops over Europe could result in a cooling impact due to an increase in soil organic carbon stocks, a decrease in the use of fertilizers, and an increase in surface albedo of the croplands. Based on the use of remote sensing data, land cover database, meteorological data, national agricultural statistics, and ground measurements, a generic model was developed to simulate the radiative forcing following the change in surface albedo. This article analyzes the impact of the introduction of cover crops in Europe during the fallow periods. Compared to previous studies, this work discusses: (i) The maximum greening potential in Europe and the associated indirect surface properties changes (ii) for snowfall episodes, and (iii) due to an increase in organic matter. This study shows that the mitigation potential of cover crops through albedo effects could reach 6.74 MtCO<sub>2</sub>-eq.yr<sup>−1</sup> by extending the periods of the introduction of the cover crops to all possible fallow periods. This mitigation could be limited to 5.68 MtCO<sub>2</sub>-eq.yr<sup>−1</sup> if the impact of snowfalls is considered. This would be equivalent to 9.12 gCO<sub>2</sub>.m<sup>−2</sup>.yr<sup>−1</sup>. Finally, this study investigates the feedback loop due to soil darkening with soil organic carbon content increase when cover crops are introduced, considering two scenarios. The first considers the soil organic carbon content increase following repeated incorporation of cover crop biomass into the soil, simulated with the DayCent model. The second, more conceptual and extreme scenario aims at alerting on the possible impact of a combination of carbon farming practices, such as biochar or organic amendments. Our results show that this effect could lead to a loss of 20% of the climate benefit (i.e., 5.39 MtCO<sub>2</sub>-eq.yr<sup>−1</sup>). In conclusion, this study shows that cover crops have a strong potential for climate mitigation through direct albedo effects (soil coverage). However, once introduced, cropland should be permanently covered by vegetation or straws in order to avoid this darkening feedback loop effect. |
| first_indexed | 2024-03-11T01:30:32Z |
| format | Article |
| id | doaj.art-9a2a932cb6f64043a9122ccff63af273 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T01:30:32Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-9a2a932cb6f64043a9122ccff63af2732023-11-18T17:23:15ZengMDPI AGRemote Sensing2072-42922023-06-011513323110.3390/rs15133231About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop EffectsGaétan Pique0Dominique Carrer1Emanuele Lugato2Rémy Fieuzal3Raphaël Garisoain4Eric Ceschia5NetCarbon, 33300 Bordeaux, FranceDESR, Météo-France, CNRS, 31100 Toulouse, FranceEuropean Commission, Joint Research Centre (JRC), 21027 Ispra, ItalyCESBIO, Université de Toulouse, CNES/CNRS/INRAE/IRD/UT3, 31400 Toulouse, FranceGMGEC, Météo-France, CNRS, 31100 Toulouse, FranceCESBIO, Université de Toulouse, CNES/CNRS/INRAE/IRD/UT3, 31400 Toulouse, FranceToday societies face an unprecedented challenge to limit global warming and restore agricultural soils. Recent studies show that the introduction of cover crops over Europe could result in a cooling impact due to an increase in soil organic carbon stocks, a decrease in the use of fertilizers, and an increase in surface albedo of the croplands. Based on the use of remote sensing data, land cover database, meteorological data, national agricultural statistics, and ground measurements, a generic model was developed to simulate the radiative forcing following the change in surface albedo. This article analyzes the impact of the introduction of cover crops in Europe during the fallow periods. Compared to previous studies, this work discusses: (i) The maximum greening potential in Europe and the associated indirect surface properties changes (ii) for snowfall episodes, and (iii) due to an increase in organic matter. This study shows that the mitigation potential of cover crops through albedo effects could reach 6.74 MtCO<sub>2</sub>-eq.yr<sup>−1</sup> by extending the periods of the introduction of the cover crops to all possible fallow periods. This mitigation could be limited to 5.68 MtCO<sub>2</sub>-eq.yr<sup>−1</sup> if the impact of snowfalls is considered. This would be equivalent to 9.12 gCO<sub>2</sub>.m<sup>−2</sup>.yr<sup>−1</sup>. Finally, this study investigates the feedback loop due to soil darkening with soil organic carbon content increase when cover crops are introduced, considering two scenarios. The first considers the soil organic carbon content increase following repeated incorporation of cover crop biomass into the soil, simulated with the DayCent model. The second, more conceptual and extreme scenario aims at alerting on the possible impact of a combination of carbon farming practices, such as biochar or organic amendments. Our results show that this effect could lead to a loss of 20% of the climate benefit (i.e., 5.39 MtCO<sub>2</sub>-eq.yr<sup>−1</sup>). In conclusion, this study shows that cover crops have a strong potential for climate mitigation through direct albedo effects (soil coverage). However, once introduced, cropland should be permanently covered by vegetation or straws in order to avoid this darkening feedback loop effect.https://www.mdpi.com/2072-4292/15/13/3231albedoradiative forcingcover cropcropland monitoringsoil darkening |
| spellingShingle | Gaétan Pique Dominique Carrer Emanuele Lugato Rémy Fieuzal Raphaël Garisoain Eric Ceschia About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects Remote Sensing albedo radiative forcing cover crop cropland monitoring soil darkening |
| title | About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects |
| title_full | About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects |
| title_fullStr | About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects |
| title_full_unstemmed | About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects |
| title_short | About the Assessment of Cover Crop Albedo Potential Cooling Effect: Risk of the Darkening Feedback Loop Effects |
| title_sort | about the assessment of cover crop albedo potential cooling effect risk of the darkening feedback loop effects |
| topic | albedo radiative forcing cover crop cropland monitoring soil darkening |
| url | https://www.mdpi.com/2072-4292/15/13/3231 |
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