气候变化领域集成服务门户(CCPortal): Changes in local and global climate feedbacks in the absence of interactive clouds: Southern ocean-climate interactions in two intermediate-complexity models

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DOI	10.1175/JCLI-D-20-0113.1
	Changes in local and global climate feedbacks in the absence of interactive clouds: Southern ocean-climate interactions in two intermediate-complexity models
	Pfister P.L.; Stocker T.F.
发表日期	2021
ISSN	0894-8755
起始页码	755
结束页码	772
卷号	34 期号:2
英文摘要	The global-mean climate feedback quantifies how much the climate system will warm in response to a forcing such as increased CO2 concentration. Under a constant forcing, this feedback becomes less negative (increasing) over time in comprehensive climate models, which has been attributed to increases in cloud and lapse-rate feedbacks. However, out of eight Earth system models of intermediate complexity (EMICs) not featuring interactive clouds, two also simulate such a feedback increase: Bern3D-LPX and LOVECLIM. Using these two models, we investigate the causes of the global-mean feedback increase in the absence of cloud feedbacks. In both models, the increase is predominantly driven by processes in the Southern Ocean region. In LOVECLIM, the global-mean increase is mainly due to a local longwave feedback increase in that region, which can be attributed to lapse-rate changes. It is enhanced by the slow atmospheric warming above the Southern Ocean, which is delayed due to regional ocean heat uptake. In Bern3D-LPX, this delayed regional warming is the main driver of the global-mean feedback increase. It acts on a near-constant local feedback pattern mainly determined by the sea ice-albedo feedback. The global-mean feedback increase is limited by the availability of sea ice: faster Southern Ocean sea ice melting due to either stronger forcing or higher equilibrium climate sensitivity (ECS) reduces the increase of the global mean feedback in Bern3D-LPX. In the highest-ECS simulation with 4 3 CO2 forcing, the feedback even becomes more negative (decreasing) over time. This reduced ice-albedo feedback due to sea ice depletion is a plausible mechanism for a decreasing feedback also in high-forcing simulations of other models. © 2020 American Meteorological Society
英文关键词	Carbon dioxide; Oceanography; Sea ice; Solar radiation; Atmospheric warming; Climate sensitivity; CO2 concentration; Earth system model; Ice albedo feedback; Intermediate complexity; Ocean heat uptake; Plausible mechanisms; Climate models; air-sea interaction; climate change; climate effect; climate modeling; climate prediction; complexity; global climate; sea ice; sensitivity analysis; Southern Ocean
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/170955
作者单位	Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland; Oeschger Center for Climate Change Research, University of Bern, Bern, Switzerland
推荐引用方式 GB/T 7714	Pfister P.L.,Stocker T.F.. Changes in local and global climate feedbacks in the absence of interactive clouds: Southern ocean-climate interactions in two intermediate-complexity models[J],2021,34(2).
APA	Pfister P.L.,&Stocker T.F..(2021).Changes in local and global climate feedbacks in the absence of interactive clouds: Southern ocean-climate interactions in two intermediate-complexity models.Journal of Climate,34(2).
MLA	Pfister P.L.,et al."Changes in local and global climate feedbacks in the absence of interactive clouds: Southern ocean-climate interactions in two intermediate-complexity models".Journal of Climate 34.2(2021).