Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1
International audience Projected changes in near-surface relative humidity (RH) remain highly model-dependent over land and may have been underestimated by the former generation global climate models. Here the focus in on the recent CNRM-CM6-1 model, which shows an enhanced land surface drying in re...
Published in: | Climate Dynamics |
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ftccsdartic:oai:HAL:hal-03013962v1 2023-05-15T18:18:46+02:00 Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 Douville, Hervé Decharme, Bertrand Delire, C. Colin, J. Joetzjer, E. Roehrig, R. Saint-Martin, D. Oudar, T. Stchepounoff, R. Voldoire, A. Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS) 2020-09 https://hal.archives-ouvertes.fr/hal-03013962 https://hal.archives-ouvertes.fr/hal-03013962/document https://hal.archives-ouvertes.fr/hal-03013962/file/Manuscript_v2.pdf https://doi.org/10.1007/s00382-020-05351-x en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-020-05351-x hal-03013962 https://hal.archives-ouvertes.fr/hal-03013962 https://hal.archives-ouvertes.fr/hal-03013962/document https://hal.archives-ouvertes.fr/hal-03013962/file/Manuscript_v2.pdf doi:10.1007/s00382-020-05351-x info:eu-repo/semantics/OpenAccess ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-03013962 Climate Dynamics, Springer Verlag, 2020, 55 (5-6), pp.1613-1629. ⟨10.1007/s00382-020-05351-x⟩ Drivers Drying Land Relative humidity Climate change [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1007/s00382-020-05351-x 2021-11-07T00:34:22Z International audience Projected changes in near-surface relative humidity (RH) remain highly model-dependent over land and may have been underestimated by the former generation global climate models. Here the focus in on the recent CNRM-CM6-1 model, which shows an enhanced land surface drying in response to quadrupled atmospheric CO 2 compared to its CNRM-CM5 predecessor. Atmosphere-only experiments with prescribed sea surface temperature (SST) are used to decompose the simulated RH changes into separate responses to uniform SST warming, pattern of SST anomalies, changes in sea-ice concentration, as well as direct radiative and physiological CO 2 effects. Results show that the strong drying simulated by CNRM-CM6-1 is due to both fast CO 2 effects and a SST-mediated response. The enhanced drying compared to CNRM-CM5 is partly due to the introduction of the physiological CO 2 effect that was not accounted for in CNRM-CM5. The global ocean warming also contributes to the RH decline over land, in reasonable agreement with the moisture advection mechanism proposed by earlier studies which however does not fully capture the contrasted RH response between the two CNRM models. The SST anomaly pattern is a significant driver of changes in RH humidity at the regional scale, which are partly explained by changes in atmospheric circulation. The improved land surface model may also contribute to a stronger soil moisture feedback in CNRM-CM6-1, which can amplify the surface aridity induced by global warming and, thereby, lead to a non-linear response of RH. Article in Journal/Newspaper Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Climate Dynamics 55 5-6 1613 1629 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Drivers Drying Land Relative humidity Climate change [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology |
spellingShingle |
Drivers Drying Land Relative humidity Climate change [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology Douville, Hervé Decharme, Bertrand Delire, C. Colin, J. Joetzjer, E. Roehrig, R. Saint-Martin, D. Oudar, T. Stchepounoff, R. Voldoire, A. Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 |
topic_facet |
Drivers Drying Land Relative humidity Climate change [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology |
description |
International audience Projected changes in near-surface relative humidity (RH) remain highly model-dependent over land and may have been underestimated by the former generation global climate models. Here the focus in on the recent CNRM-CM6-1 model, which shows an enhanced land surface drying in response to quadrupled atmospheric CO 2 compared to its CNRM-CM5 predecessor. Atmosphere-only experiments with prescribed sea surface temperature (SST) are used to decompose the simulated RH changes into separate responses to uniform SST warming, pattern of SST anomalies, changes in sea-ice concentration, as well as direct radiative and physiological CO 2 effects. Results show that the strong drying simulated by CNRM-CM6-1 is due to both fast CO 2 effects and a SST-mediated response. The enhanced drying compared to CNRM-CM5 is partly due to the introduction of the physiological CO 2 effect that was not accounted for in CNRM-CM5. The global ocean warming also contributes to the RH decline over land, in reasonable agreement with the moisture advection mechanism proposed by earlier studies which however does not fully capture the contrasted RH response between the two CNRM models. The SST anomaly pattern is a significant driver of changes in RH humidity at the regional scale, which are partly explained by changes in atmospheric circulation. The improved land surface model may also contribute to a stronger soil moisture feedback in CNRM-CM6-1, which can amplify the surface aridity induced by global warming and, thereby, lead to a non-linear response of RH. |
author2 |
Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Douville, Hervé Decharme, Bertrand Delire, C. Colin, J. Joetzjer, E. Roehrig, R. Saint-Martin, D. Oudar, T. Stchepounoff, R. Voldoire, A. |
author_facet |
Douville, Hervé Decharme, Bertrand Delire, C. Colin, J. Joetzjer, E. Roehrig, R. Saint-Martin, D. Oudar, T. Stchepounoff, R. Voldoire, A. |
author_sort |
Douville, Hervé |
title |
Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 |
title_short |
Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 |
title_full |
Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 |
title_fullStr |
Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 |
title_full_unstemmed |
Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1 |
title_sort |
drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xco2 in cnrm-cm6-1 |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-03013962 https://hal.archives-ouvertes.fr/hal-03013962/document https://hal.archives-ouvertes.fr/hal-03013962/file/Manuscript_v2.pdf https://doi.org/10.1007/s00382-020-05351-x |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-03013962 Climate Dynamics, Springer Verlag, 2020, 55 (5-6), pp.1613-1629. ⟨10.1007/s00382-020-05351-x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-020-05351-x hal-03013962 https://hal.archives-ouvertes.fr/hal-03013962 https://hal.archives-ouvertes.fr/hal-03013962/document https://hal.archives-ouvertes.fr/hal-03013962/file/Manuscript_v2.pdf doi:10.1007/s00382-020-05351-x |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s00382-020-05351-x |
container_title |
Climate Dynamics |
container_volume |
55 |
container_issue |
5-6 |
container_start_page |
1613 |
op_container_end_page |
1629 |
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1766195468905218048 |