气候变化领域集成服务门户(CCPortal): Perturbing Parameters to Understand Cloud Contributions to Climate Change

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DOI	10.1175/JCLI-D-23-0250.1
	Perturbing Parameters to Understand Cloud Contributions to Climate Change
	Duffy, Margaret L.; Medeiros, Brian; Gettelman, Andrew; Eidhammera, Trude
发表日期	2024
ISSN	0894-8755
EISSN	1520-0442
起始页码	37
结束页码	1
卷号	37 期号:1
英文摘要	The sensitivity of cloud feedbacks to atmospheric model parameters is evaluated using a CAM6 perturbed parameter ensemble (PPE). The CAM6 PPE perturbs 45 parameters across 262 simulations, 206 of which are used here. The spread in the total cloud feedback and its six components across the CAM6 PPE are comparable to the spread across the CMIP6 and AMIP ensembles, indicating that parametric uncertainty mirrors structural uncertainty. However, the high-cloud altitude feedback is generally larger in the CAM6 PPE than WCRP assessment, CMIP6, and AMIP values. We evaluate the influence of each of the 45 parameters on the total cloud feedback and each of the six cloud feedback compo-nents. We also explore whether the CAM6 PPE can be used to constrain the total cloud feedback, with inconclusive results. Further, we find that despite the large parametric sensitivity of cloud feedbacks in CAM6, a substantial increase in cloud feedbacks from CAM5 to CAM6 is not a result of changes in parameter values. Notably, the CAM6 PPE is run with a more recent version of CAM6 (CAM6.3) than was used for AMIP (CAM6.0) and has a smaller total cloud feedback (0.56 W m-2 K-1) as compared to CAM6.0 (0.81 W m-2 K-1) owing primarily to reductions in low clouds over the tropics and midlatitudes. The work highlights the large sensitivity of cloud feedbacks to both parameter values and structural details in CAM6.
英文关键词	Feedback; Climate sensitivity; Cloud parameterizations
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001124579300001
来源期刊	JOURNAL OF CLIMATE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/297091
作者单位	United States Department of Energy (DOE); Pacific Northwest National Laboratory
推荐引用方式 GB/T 7714	Duffy, Margaret L.,Medeiros, Brian,Gettelman, Andrew,et al. Perturbing Parameters to Understand Cloud Contributions to Climate Change[J],2024,37(1).
APA	Duffy, Margaret L.,Medeiros, Brian,Gettelman, Andrew,&Eidhammera, Trude.(2024).Perturbing Parameters to Understand Cloud Contributions to Climate Change.JOURNAL OF CLIMATE,37(1).
MLA	Duffy, Margaret L.,et al."Perturbing Parameters to Understand Cloud Contributions to Climate Change".JOURNAL OF CLIMATE 37.1(2024).