气候变化领域集成服务门户(CCPortal): Changes in clouds and atmospheric circulation associated with rapid adjustment induced by increased atmospheric CO2: a multiscale modeling framework study

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DOI	10.1007/s00382-018-4401-2
	Changes in clouds and atmospheric circulation associated with rapid adjustment induced by increased atmospheric CO2: a multiscale modeling framework study
	Xu K.-M.; Li Z.; Cheng A.; Hu Y.
发表日期	2020
ISSN	0930-7575
起始页码	277
结束页码	293
卷号	55
英文摘要	The radiative heating increase due to increased CO2 concentration is the primary source for the rapid adjustment of atmospheric circulation and clouds. In this study, we investigate the rapid adjustment resulting from an instantaneous doubling of CO2 and its physical mechanism using a multiscale modeling framework (MMF). The cloud-resolving model component of this MMF includes a sophisticated third-order turbulence closure and the MMF simulates realistic shallow and deep cloud climatology and boundary layer turbulence. Although the simulated cloud adjustment and its mechanism generally agree with earlier studies with conventional global climate models and another MMF with a lower-order turbulence closure, this MMF simulates an increase in the global-mean shortwave and net cloud radiative cooling and a negative cloud radiative effect change due to cloud adjustment. This result is related to the large increase in low-level clouds over the extratropical and subtropical oceans, resulting from reduced cloud-top entrainment implied from strengthened inversion. The downshift of planetary boundary layer and low-level clouds is generally weaker than that simulated by other models, which is due to reduction of shallow cumulus in the ascending and weak subsidence circulation regimes but to increase of stratocumulus in the strongest subsidence regime. Optically thicker stratocumulus compensates for reduced cooling by shallow cumulus. The reduced strength of all oceanic circulation regimes, which may be contributed by weakened energy transport resulting from water vapor and cloud CO2 masking effects, not only reduces optical depth of convective clouds but also shifts cloud coverage to lands where deep convection is enhanced. © 2018, The Author(s).
英文关键词	Cloud radiative effects; CO2 forcing; Low-level clouds; Multiscale modeling framework; Rapid adjustment
语种	英语
scopus关键词	atmospheric circulation; atmospheric convection; boundary layer; carbon dioxide; climate modeling; cloud radiative forcing
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/145417
作者单位	Science Directorate, NASA Langley Research Center, Mail Stop 420, Hampton, VA 23681, United States; NASA Postdoctoral Program, Universities Space Research Association, Hampton, VA, United States; NOAA EMC/NCEP, College Park, MD, United States
推荐引用方式 GB/T 7714	Xu K.-M.,Li Z.,Cheng A.,et al. Changes in clouds and atmospheric circulation associated with rapid adjustment induced by increased atmospheric CO2: a multiscale modeling framework study[J],2020,55.
APA	Xu K.-M.,Li Z.,Cheng A.,&Hu Y..(2020).Changes in clouds and atmospheric circulation associated with rapid adjustment induced by increased atmospheric CO2: a multiscale modeling framework study.Climate Dynamics,55.
MLA	Xu K.-M.,et al."Changes in clouds and atmospheric circulation associated with rapid adjustment induced by increased atmospheric CO2: a multiscale modeling framework study".Climate Dynamics 55(2020).