气候变化领域集成服务门户(CCPortal): Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1

CCPortal

DOI	10.1007/s00382-020-05351-x
	Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1
	Douville H.; Decharme B.; Delire C.; Colin J.; Joetzjer E.; Roehrig R.; Saint-Martin D.; Oudar T.; Stchepounoff R.; Voldoire A.
发表日期	2020
ISSN	0930-7575
起始页码	1613
结束页码	1629
卷号	55
英文摘要	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 CO2 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 CO2 effects. Results show that the strong drying simulated by CNRM-CM6-1 is due to both fast CO2 effects and a SST-mediated response. The enhanced drying compared to CNRM-CM5 is partly due to the introduction of the physiological CO2 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. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Climate change; Drivers; Drying; Land; Relative humidity
语种	英语
scopus关键词	carbon dioxide; climate change; climate modeling; experimental study; global warming; relative humidity; sea ice; sea surface temperature; soil moisture; temperature anomaly
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145353
作者单位	Centre National de Recherches Météorologiques, CNRM/GMGEC/AMACS, Université de Toulouse, Météo-France, CNRS, 42 Avenue Gaspard Coriolis, Toulouse Cedex 01, 31057, France
推荐引用方式 GB/T 7714	Douville H.,Decharme B.,Delire C.,et al. Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1[J],2020,55.
APA	Douville H..,Decharme B..,Delire C..,Colin J..,Joetzjer E..,...&Voldoire A..(2020).Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1.Climate Dynamics,55.
MLA	Douville H.,et al."Drivers of the enhanced decline of land near-surface relative humidity to abrupt 4xCO2 in CNRM-CM6-1".Climate Dynamics 55(2020).