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DOI	10.1175/JCLI-D-19-0131.1
	Sensitivity of surface temperature to oceanic forcing via Q-flux Green’s function experiments. Part III: Asymmetric response to warming and cooling
	Liu F.; Lu J.; Huang Y.; Ruby Leung L.; Harrop B.E.; Luo Y.
发表日期	2020
ISSN	0894-8755
起始页码	1283
结束页码	1297
卷号	33 期号:4
英文摘要	Climate response is often assumed to be linear in climate sensitivity studies. However, by examining the surface temperature (TS) response to pairs of oceanic forcings of equal amplitude but opposite sign in a large set of local q-flux perturbation experiments with CAM5 coupled to a slab, we find strong asymmetry in TS responses to the heating and cooling forcings, indicating a strong nonlinearity intrinsic to the climate system examined. Regardless of where the symmetric forcing is placed, the cooling response to the negative forcing always exceeds the warming to the positive forcing, implying an intrinsic inclination toward cooling of our current climate. Thus, the ongoing global warming induced by increasing greenhouse gases may have already been alleviated by the asymmetric component of the response. The common asymmetry in TS response peaks in high latitudes, especially along sea ice edges, with notable seasonal dependence. Decomposition into different radiative feedbacks through a radiative kernel indicates that the asymmetry in the TS response is realized largely through lapse rate and albedo feedbacks. Further process interference experiments disabling the seasonal cycle and/or sea ice reveal that the asymmetry originates ultimately from the presence of the sea ice component and is further amplified by the seasonal cycle. The fact that a pair of opposite tropical q-flux forcings can excite very similar asymmetric response as a pair placed at 558S strongly suggests the asymmetric response is a manifestation of an internal mode of the climate model system. © 2020 American Meteorological Society.
英文关键词	Atmospheric temperature; Global warming; Greenhouse gases; Sea ice; Surface properties; Asymmetric component; Asymmetric response; Climate sensitivity; Heating and cooling; Sea-ice components; Seasonal dependence; Strong nonlinearity; Surface temperatures; Climate models; air-sea interaction; climate modeling; cooling; experimental study; Green function; greenhouse gas; perturbation; radiative forcing; sea ice; sensitivity analysis; surface temperature; warming
语种	英语
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/171457
作者单位	Key Laboratory of Physical Oceanography, Institute for Advanced Ocean Studies, Ocean University of China, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, QC, Canada
推荐引用方式 GB/T 7714	Liu F.,Lu J.,Huang Y.,等. Sensitivity of surface temperature to oceanic forcing via Q-flux Green’s function experiments. Part III: Asymmetric response to warming and cooling[J],2020,33(4).
APA	Liu F.,Lu J.,Huang Y.,Ruby Leung L.,Harrop B.E.,&Luo Y..(2020).Sensitivity of surface temperature to oceanic forcing via Q-flux Green’s function experiments. Part III: Asymmetric response to warming and cooling.Journal of Climate,33(4).
MLA	Liu F.,et al."Sensitivity of surface temperature to oceanic forcing via Q-flux Green’s function experiments. Part III: Asymmetric response to warming and cooling".Journal of Climate 33.4(2020).