气候变化领域集成服务门户(CCPortal): Shallow cumulus cloud feedback in large eddy simulations-bridging the gap to storm-resolving models

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DOI	10.5194/acp-21-3275-2021
	Shallow cumulus cloud feedback in large eddy simulations-bridging the gap to storm-resolving models
	Radtke J.; Mauritsen T.; Hohenegger C.
发表日期	2021
ISSN	1680-7316
起始页码	3275
结束页码	3288
卷号	21 期号:5
英文摘要	The response of shallow trade cumulus clouds to global warming is a leading source of uncertainty in projections of the Earth's changing climate. A setup based on the Rain In Cumulus over the Ocean field campaign is used to simulate a shallow trade wind cumulus field with the Icosahedral Nonhydrostatic Large Eddy Model in a control and a perturbed 4 K warmer climate, while degrading horizontal resolution from 100 m to 5 km. As the resolution is coarsened, the base-state cloud fraction increases substantially, especially near cloud base, lateral mixing is weaker, and cloud tops reach higher. Nevertheless, the overall vertical structure of the cloud layer is surprisingly robust across resolutions. In a warmer climate, cloud cover reduces, alone constituting a positive shortwave cloud feedback: the strength correlates with the amount of base-state cloud fraction and thus is stronger at coarser resolutions. Cloud thickening, resulting from more water vapour availability for condensation in a warmer climate, acts as a compensating feedback, but unlike the cloud cover reduction it is largely resolution independent. Therefore, refining the resolution leads to convergence to a near-zero shallow cumulus feedback. This dependence holds in experiments with enhanced realism including precipitation processes or warming along a moist adiabat instead of uniform warming. Insofar as these findings carry over to other models, they suggest that storm-resolving models may exaggerate the trade wind cumulus cloud feedback. © Author(s) 2021.
语种	英语
scopus关键词	climate feedback; climate modeling; cloud microphysics; cloud radiative forcing; cumulus; large eddy simulation; shortwave radiation; storm; trade wind; uncertainty analysis
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247088
作者单位	Meteorological Institute, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, Hamburg, Germany; International Max Planck Research School on Earth System Modelling, Max Planck Institute for Meteorology, Hamburg, Germany; Department of Meteorology, Stockholm University, Stockholm, Sweden; Max Planck Institute for Meteorology, Hamburg, Germany
推荐引用方式 GB/T 7714	Radtke J.,Mauritsen T.,Hohenegger C.. Shallow cumulus cloud feedback in large eddy simulations-bridging the gap to storm-resolving models[J],2021,21(5).
APA	Radtke J.,Mauritsen T.,&Hohenegger C..(2021).Shallow cumulus cloud feedback in large eddy simulations-bridging the gap to storm-resolving models.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	Radtke J.,et al."Shallow cumulus cloud feedback in large eddy simulations-bridging the gap to storm-resolving models".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).