DOI: 10.1038/s41561-021-00691-7
论文题名: Earth’s long-term climate stabilized by clouds
作者: Goldblatt C. ; McDonald V.L. ; McCusker K.E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 3 起始页码: 143
结束页码: 150
语种: 英语
英文关键词: albedo
; chemical composition
; climate feedback
; climate modeling
; cloud cover
; glaciation
; global climate
; radiative forcing
; stratocumulus
英文摘要: The Sun was dimmer earlier in Earth’s history, but glaciation was rare in the Precambrian: this is the ‘faint young Sun problem’. Most solutions rely on changes to the chemical composition of the atmosphere to compensate via a stronger greenhouse effect, whereas physical feedbacks have received less attention. We perform global climate model experiments, using two versions of the Community Atmosphere Model, in which a reduced solar constant is offset by higher CO2. Model runs corresponding to past climate show a substantial decrease in low clouds and hence planetary albedo compared with present, which contributes 40% of the required forcing to offset the faint Sun. Through time, the climatically important stratocumulus decks have grown in response to a brightening Sun and decreasing greenhouse effect, driven by stronger cloud-top radiative cooling (which drives low cloud formation) and a stronger inversion (which sustains clouds against dry air entrainment from above). We find that systematic changes to low clouds have had a major role in stabilizing climate through Earth’s history, which demonstrates the importance of physical feedbacks on long-term climate stabilization, and a smaller role for geochemical feedbacks. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169752
Appears in Collections: 气候变化与战略
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作者单位: School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Rhodium Group, New York, NY, United States
Recommended Citation:
Goldblatt C.,McDonald V.L.,McCusker K.E.. Earth’s long-term climate stabilized by clouds[J]. Nature Geoscience,2021-01-01,14(3)