气候变化领域集成服务门户(CCPortal): Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution

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DOI	10.1038/s41561-020-0561-x
	Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution
	Gillmann C.; Golabek G.J.; Raymond S.N.; Schönbächler M.; Tackley P.J.; Dehant V.; Debaille V.
发表日期	2020
ISSN	17520894
起始页码	265
结束页码	269
卷号	13 期号:4
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.
英文关键词	accretion; enstatite; mantle convection; planetary atmosphere; planetary evolution; Venus; Venusia
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206778
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
推荐引用方式 GB/T 7714	Gillmann C.,Golabek G.J.,Raymond S.N.,等. Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution[J],2020,13(4).
APA	Gillmann C..,Golabek G.J..,Raymond S.N..,Schönbächler M..,Tackley P.J..,...&Debaille V..(2020).Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution.Nature Geoscience,13(4).
MLA	Gillmann C.,et al."Dry late accretion inferred from Venus’s coupled atmosphere and internal evolution".Nature Geoscience 13.4(2020).