globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2958
论文题名:
Detection of a persistent meteoric metal layer in the Martian atmosphere
作者: Crismani M.M.J.; Schneider N.M.; Plane J.M.C.; Evans J.S.; Jain S.K.; Chaffin M.S.; Carrillo-Sanchez J.D.; Deighan J.I.; Yelle R.V.; Stewart A.I.F.; McClintock W.; Clarke J.; Holsclaw G.M.; Stiepen A.; Montmessin F.; Jakosky B.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:6
起始页码: 401
结束页码: 404
语种: 英语
Scopus关键词: detection method ; Martian atmosphere ; meteor ; persistence ; remote sensing ; seasonal variation ; solar system ; spacecraft ; temporal variation
英文摘要: Interplanetary dust particles sporadically enter planetary atmospheres at orbital velocities and ablate as collisions occur with ambient gases to produce a persistent layer of metallic atoms (for example, Fe, Mg, Na) in their upper atmospheres. Such layers are well studied at Earth, but have not been directly detected elsewhere in the Solar System. Here we report the detection of a meteoric layer consisting of Mg+ ions near an altitude of 90 km in the Martian atmosphere from ultraviolet remote sensing observations by NASA's MAVEN spacecraft. We observe temporal variability in the Mg+ layer over the course of a Martian year, moving up and down in altitude seasonally and in response to dust storms, and displaying diurnal fluctuations in density. We also find that most meteor showers do not significantly perturb this layer, which constrains the fluence of eleven observed Martian meteor showers to less than our estimated global dust flux. The persistence and variability of the Mg+ layer are difficult to explain with existing models and reconcile with other transient layers of ions observed in the Martian ionosphere. We suggest that the transient layers are not sourced from the persistent Mg+ layer and thus not derived from meteoric material, but are ambient ions produced by some unknown mechanism. © 2017 Macmillan Publishers Limited, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105770
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: Laboratory for Atmospheric and Space Physics (LASP), University of ColoradoCO, United States; School of Chemistry, University of Leeds, Leeds, United Kingdom; Computational Physics, Inc., Springfield, VA, United States; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Center for Space Physics, Boston University, Boston, MA, United States; Laboratoire de Physique Atmosphérique et Planétaire, Space Sciences, Technologies and Astrophysics Research (STAR), University of Liège, Liège, Belgium; LATMOS/IPSL, Guyancourt, France

Recommended Citation:
Crismani M.M.J.,Schneider N.M.,Plane J.M.C.,et al. Detection of a persistent meteoric metal layer in the Martian atmosphere[J]. Nature Geoscience,2017-01-01,10(6)
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