气候变化领域集成服务门户(CCPortal): Hadley cell expansion in CMIP6 models

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DOI	10.5194/acp-20-5249-2020
	Hadley cell expansion in CMIP6 models
	Grise K.M.; Davis S.M.
发表日期	2020
ISSN	1680-7316
起始页码	5249
结束页码	5268
卷号	20 期号:9
英文摘要	In response to increasing greenhouse gases, the subtropical edges of Earth's Hadley circulation shift poleward in global climate models. Recent studies have found that reanalysis trends in the Hadley cell edge over the past 30-40 years are within the range of trends simulated by Coupled Model Intercomparison Project Phase 5 (CMIP5) models and have documented seasonal and hemispheric asymmetries in these trends. In this study, we evaluate whether these conclusions hold for the newest generation of models (CMIP6). Overall, we find similar characteristics of Hadley cell expansion in CMIP5 and CMIP6 models. In both CMIP5 and CMIP6 models, the poleward shift of the Hadley cell edge in response to increasing greenhouse gases is 2-3 times larger in the Southern Hemisphere (SH), except during September-November. The trends from CMIP5 and CMIP6 models agree well with reanalyses, although prescribing observed coupled atmosphere-ocean variability allows the models to better capture reanalysis trends in the Northern Hemisphere (NH). We find two notable differences between CMIP5 and CMIP6 models. First, while both CMIP5 and CMIP6 models contract the NH summertime Hadley circulation equatorward (particularly over the Pacific sector), this contraction is larger in CMIP6 models due to their higher average climate sensitivity. Second, in recent decades, the poleward shift of the NH annual-mean Hadley cell edge is slightly larger in CMIP6 models. Increasing greenhouse gases drive similar trends in CMIP5 and CMIP6 models, so the larger recent NH trends in CMIP6 models point to the role of other forcings, such as aerosols. © 2020 Author(s).
语种	英语
scopus关键词	atmosphere-ocean coupling; climate modeling; greenhouse gas; Hadley cell; Northern Hemisphere; seasonal variation; Southern Hemisphere; trend analysis; Pacific Ocean
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/141367
作者单位	Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, United States; NOAA Earth System Research Laboratory Chemical Sciences Division, Boulder, CO 80305, United States
推荐引用方式 GB/T 7714	Grise K.M.,Davis S.M.. Hadley cell expansion in CMIP6 models[J],2020,20(9).
APA	Grise K.M.,&Davis S.M..(2020).Hadley cell expansion in CMIP6 models.Atmospheric Chemistry and Physics,20(9).
MLA	Grise K.M.,et al."Hadley cell expansion in CMIP6 models".Atmospheric Chemistry and Physics 20.9(2020).