气候变化领域集成服务门户(CCPortal): Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover

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DOI	10.1073/pnas.2003730117
	Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover
	Schneider T.; Kaul C.M.; Pressel K.G.
发表日期	2020
ISSN	0027-8424
起始页码	30179
结束页码	30185
卷号	117 期号:48
英文摘要	Discussions of countering global warming with solar geoengineering assume that warming owing to rising greenhouse-gas concentrations can be compensated by artificially reducing the amount of sunlight Earth absorbs. However, solar geoengineering may not be fail-safe to prevent global warming because CO2 can directly affect cloud cover: It reduces cloud cover by modulating the longwave radiative cooling within the atmosphere. This effect is not mitigated by solar geoengineering. Here, we use idealized high-resolution simulations of clouds to show that, even under a sustained solar geoengineering scenario with initially only modest warming, subtropical stratocumulus clouds gradually thin and may eventually break up into scattered cumulus clouds, at concentrations exceeding 1,700 parts per million (ppm). Because stratocumulus clouds cover large swaths of subtropical oceans and cool Earth by reflecting incident sunlight, their loss would trigger strong (about 5 K) global warming. Thus, the results highlight that, at least in this extreme and idealized scenario, solar geoengineering may not suffice to counter greenhouse-gas-driven global warming. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Global warming \| geoengineering \| cloud feedback
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160699
作者单位	Schneider, T., California Institute of Technology, Pasadena, CA 91125, United States, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91125, United States; Kaul, C.M., Atmospheric Sciences & Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99354, United States; Pressel, K.G., Atmospheric Sciences & Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99354, United States
推荐引用方式 GB/T 7714	Schneider T.,Kaul C.M.,Pressel K.G.. Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover[J],2020,117(48).
APA	Schneider T.,Kaul C.M.,&Pressel K.G..(2020).Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover.Proceedings of the National Academy of Sciences of the United States of America,117(48).
MLA	Schneider T.,et al."Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover".Proceedings of the National Academy of Sciences of the United States of America 117.48(2020).