DOI: 10.1038/s41561-020-0561-x
论文题名: Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution
作者: Gillmann C. ; Golabek G.J. ; Raymond S.N. ; Schönbächler M. ; Tackley P.J. ; Dehant V. ; Debaille V.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 4 起始页码: 265
结束页码: 269
语种: 英语
英文关键词: accretion
; enstatite
; mantle convection
; planetary atmosphere
; planetary evolution
; Venus
; Venusia
英文摘要: It remains contentious whether the meteoritic material delivered to the terrestrial planets after the end of core formation was rich or poor in water and other volatiles. As Venus’s atmosphere has probably experienced less volatile recycling over its history than Earth’s, it may be possible to constrain the volatile delivery to the primitive Venusian atmosphere from the planet’s present-day atmospheric composition. Here we investigate the long-term evolution of Venus using self-consistent numerical simulations of global thermochemical mantle convection coupled with both an atmospheric evolution model and a late accretion N-body delivery model. We found that atmospheric escape is only able to remove a limited amount of water over the history of the planet, and that the late accretion of wet material exceeds this sink and would result in a present-day atmosphere that is too rich in volatiles. A preferentially dry composition of the late accretion impactors is most consistent with measurements of atmospheric H2O, CO2 and N2. Hence, we suggest that the late accreted material delivered to Venus was mostly dry enstatite chondrite, consistent with isotopic data for Earth, with less than 2.5% (by mass) wet carbonaceous chondrites. In this scenario, the majority of Venus’s and Earth’s water would have been delivered during the main accretion phase. © 2020, 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/169601
Appears in Collections: 气候变化与战略
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作者单位: Laboratoire G-Time, Université Libre de Bruxelles, Brussels, Belgium; Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany; Laboratoire d’Astrophysique de Bordeaux, CNRS and Université de Bordeaux, Pessac, France; Department of Earth Sciences, ETH Zurich, Zurich, Switzerland; Université catholique de Louvain, Louvain-la-Neuve, Belgium; Royal Observatory of Belgium, Brussels, Belgium
Recommended Citation:
Gillmann C.,Golabek G.J.,Raymond S.N.,et al. Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution[J]. Nature Geoscience,2020-01-01,13(4)