气候变化领域集成服务门户(CCPortal): Climate Change Feedbacks in Aquaplanet Experiments With Explicit and Parametrized Convection for Horizontal Resolutions of 2,525 Up to 5 km

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DOI	10.1029/2019MS001677
	Climate Change Feedbacks in Aquaplanet Experiments With Explicit and Parametrized Convection for Horizontal Resolutions of 2,525 Up to 5 km
	Retsch M.H.; Mauritsen T.; Hohenegger C.
发表日期	2019
ISSN	19422466
起始页码	2070
结束页码	2088
卷号	11 期号:7
英文摘要	Earth's equilibrium climate sensitivity (ECS) is the long-term response to doubled atmospheric CO2 and likely between 1.5 and 4.5 K. Conventional general circulation models do not convincingly narrow down this range, and newly developed nonhydrostatic models with relatively fine horizontal resolutions of a few kilometers have thus far delivered diverse results. Here we use the nonhydrostatic ICON model with the physics package normally used for climate simulations at resolutions as fine as 5 km to study the response to a uniform surface warming in an aquaplanet configuration. We apply the model in two setups: one with convection parametrization employed and one with explicit convection. ICON exhibits a negative total feedback independent of convective representation, thus providing a stable climate with an ECS comparable to other general circulation models, though three interesting new results are found. First, ECS varies little across resolution for both setups but runs with explicit convection have systematically lower ECS than the parametrized case, mainly due to more negative tropical clear-sky longwave feedbacks. These are a consequence of a drier mean state of about 6% relative humidity for explicit convection and less midtropospheric moistening with global warming. Second, shortwave feedbacks switch from positive to negative with increasing resolution, originating foremost in the tropics and high latitudes. Third, the model shows no discernible high cloud area feedback (iris effect) in any configuration. It is possible that ICON's climate model parametrizations applied here are less appropriate for cloud resolving scales, and therefore, ongoing developments aim at implementing a more advanced prognostic cloud microphysics scheme. © 2019. The Authors.
英文关键词	aquaplanet; climate change feedbacks; ECS; explicit convection; high resolution; ICON
语种	英语
scopus关键词	Atmospheric humidity; Global warming; Tropics; aquaplanet; Climate sensitivity; Cloud microphysics; General circulation model; High resolution; Horizontal resolution; ICON; Nonhydrostatic model; Climate models; atmospheric convection; climate change; climate feedback; experimental study; general circulation model; long-term change; parameterization; spatial resolution
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156974
作者单位	Max Planck Institute for Meteorology, Hamburg, Germany; School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia; Department of Meteorology, Stockholm University, Stockholm, Sweden
推荐引用方式 GB/T 7714	Retsch M.H.,Mauritsen T.,Hohenegger C.. Climate Change Feedbacks in Aquaplanet Experiments With Explicit and Parametrized Convection for Horizontal Resolutions of 2,525 Up to 5 km[J],2019,11(7).
APA	Retsch M.H.,Mauritsen T.,&Hohenegger C..(2019).Climate Change Feedbacks in Aquaplanet Experiments With Explicit and Parametrized Convection for Horizontal Resolutions of 2,525 Up to 5 km.Journal of Advances in Modeling Earth Systems,11(7).
MLA	Retsch M.H.,et al."Climate Change Feedbacks in Aquaplanet Experiments With Explicit and Parametrized Convection for Horizontal Resolutions of 2,525 Up to 5 km".Journal of Advances in Modeling Earth Systems 11.7(2019).