气候变化领域集成服务门户(CCPortal): Climate More Responsive to Marine Cloud Brightening Than Ocean Albedo Modification: A Model Study

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DOI	10.1029/2020JD033256
	Climate More Responsive to Marine Cloud Brightening Than Ocean Albedo Modification: A Model Study
	Zhao M.; Cao L.; Duan L.; Bala G.; Caldeira K.
发表日期	2021
ISSN	2169897X
卷号	126 期号:3
英文摘要	Solar radiation modification has been suggested as a backup option to reduce anthropogenic warming. Marine cloud brightening (MCB) and ocean albedo modification (OAM) are two proposed approaches to intentionally reflect sunlight back to space over oceanic regions. Using the NCAR Community Earth System Model, we compare climate response to MCB and OAM under the framework of fast adjustment and slow feedback. We implement MCB and OAM uniformly over the global ocean to offset CO2-induced warming. We find that to offset 3.3 K global mean warming from a doubling of CO2, diagnosed effective radiative forcing is −4.8 and −3.6 W m−2 for OAM and MCB, respectively. Correspondingly, radiative forcing efficacy of OAM is about 70% of MCB. Fast climate adjustment differs in response to MCB and OAM forcing. MCB cools the lower atmosphere by reflecting sunlight from cloud, causing a reduction in sunlight absorption in the atmosphere. In contrast, OAM, by reflecting more sunlight from surface, increases shortwave heating of the lower atmosphere, leading to a decrease in low marine clouds and hence a positive cloudy-sky shortwave forcing that partly compensates the negative clear-sky shortwave forcing. The slow climate response and pattern of equilibrium climate change are similar between MCB and OAM. As for hydrological cycle, relative to the climate under a doubling of CO2, both MCB and OAM produce an increase in precipitation and runoff over tropical land. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185523
作者单位	Key Laboratory of Geoscience Big Data and Deep Resources of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China; Department of Global Ecology, Carnegie Institution, Stanford, CA, United States; Center for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, India
推荐引用方式 GB/T 7714	Zhao M.,Cao L.,Duan L.,et al. Climate More Responsive to Marine Cloud Brightening Than Ocean Albedo Modification: A Model Study[J],2021,126(3).
APA	Zhao M.,Cao L.,Duan L.,Bala G.,&Caldeira K..(2021).Climate More Responsive to Marine Cloud Brightening Than Ocean Albedo Modification: A Model Study.Journal of Geophysical Research: Atmospheres,126(3).
MLA	Zhao M.,et al."Climate More Responsive to Marine Cloud Brightening Than Ocean Albedo Modification: A Model Study".Journal of Geophysical Research: Atmospheres 126.3(2021).