globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2003730117
论文题名:
Solar geoengineering may not prevent strong warming from direct effects of CO2 on stratocumulus cloud cover
作者: Schneider T.; Kaul C.M.; Pressel K.G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:48
起始页码: 30179
结束页码: 30185
语种: 英语
英文关键词: Global warming | geoengineering | cloud feedback
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.
Citation statistics:
被引频次[WOS]:8   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163915
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(48)
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