Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1

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 at...

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Veröffentlicht in:Climate dynamics 2020-09, Vol.55 (5-6), p.1613-1629
Hauptverfasser: Douville, Hervé, Decharme, B., Delire, C., Colin, J., Joetzjer, E., Roehrig, R., Saint-Martin, D., Oudar, T., Stchepounoff, R., Voldoire, A.
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container_end_page 1629
container_issue 5-6
container_start_page 1613
container_title Climate dynamics
container_volume 55
creator Douville, Hervé
Decharme, B.
Delire, C.
Colin, J.
Joetzjer, E.
Roehrig, R.
Saint-Martin, D.
Oudar, T.
Stchepounoff, R.
Voldoire, A.
description 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.
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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. 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subjects Advection
Anomalies
Aridity
Atmospheric circulation
Atmospheric circulation changes
Atmospheric models
Carbon dioxide
Carbon dioxide atmospheric concentrations
Climate change
Climate models
Climatology
Computer simulation
Drying
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Global climate
Global climate models
Global warming
Humidity
Hydrology
Land surface models
Meteorology
Nonlinear response
Ocean temperature
Ocean warming
Oceanography
Physiological effects
Physiology
Relative humidity
Sciences of the Universe
Sea ice
Sea ice concentrations
Sea surface
Sea surface temperature
Sea surface temperature anomalies
Soil
Soil moisture
Surface temperature
title Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1
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