DOI: 10.1038/ngeo2293
论文题名: Episodic warming of early Mars by punctuated volcanism
作者: Halevy I. ; Head Iii J.W.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 12 起始页码: 865
结束页码: 868
语种: 英语
Scopus关键词: episodic event
; greenhouse gas
; Mars
; Martian atmosphere
; volcanism
英文摘要: The widespread evidence for liquid water on the surface of early Mars is difficult to reconcile with a dimmer early Sun. Many geomorphological features suggestive of aqueous activity, such as valley networks and open-basin lakes, date to approximately 3.7 billion years ago, coincident with a period of high volcanic activity. This suggests that volcanic emissions of greenhouse gases could have sustained a warmer and wetter climate on early Mars. However, models that consider only CO2 and H 2 O emissions fail to produce such climates, and the net climatic effect of the sulphur-bearing gases SO 2 and H 2 S is debated. Here we investigate the atmospheric response to brief and strong volcanic eruptions, including sulphur emissions and an evolving population of H 2 SO 4 -bearing aerosols, using a microphysical aerosol model. In our simulations, strong greenhouse warming by SO 2 is accompanied by modest cooling by sulphate aerosol formation in a presumably dusty early Martian atmosphere. The simulated net positive radiative effect in an otherwise cold climate temporarily increases surface temperatures to permit above-freezing peak daily temperatures at low latitudes. We conclude that punctuated volcanic activity can repeatedly lead to warm climatic conditions that may have persisted for decades to centuries on Mars, consistent with evidence for transient liquid water on the Martian surface. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106633
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; Department of Earth,Environmental and Planetary Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Halevy I.,Head Iii J.W.. Episodic warming of early Mars by punctuated volcanism[J]. Nature Geoscience,2014-01-01,7(12)