Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1
Autor: | Hervé Douville, R. Stchepounoff, David Saint-Martin, Jeanne Colin, Aurore Voldoire, Romain Roehrig, Thomas Oudar, Christine Delire, Bertrand Decharme, Emilie Joetzjer |
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Přispěvatelé: | Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Drivers Atmospheric circulation Effects of global warming on oceans Global warming Humidity Climate change Relative humidity Moisture advection 15. Life on land [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology 010502 geochemistry & geophysics 01 natural sciences land Sea surface temperature climate change 13. Climate action [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Climatology Environmental science drying [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology 0105 earth and related environmental sciences |
Zdroj: | Climate Dynamics Climate Dynamics, Springer Verlag, 2020, 55 (5-6), pp.1613-1629. ⟨10.1007/s00382-020-05351-x⟩ Climate Dynamics, 2020, 55 (5-6), pp.1613-1629. ⟨10.1007/s00382-020-05351-x⟩ |
ISSN: | 0930-7575 1432-0894 |
Popis: | 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. |
Databáze: | OpenAIRE |
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