DOI: 10.1002/2017JE005510
Scopus记录号: 2-s2.0-85043271698
论文题名: Meteoric Metal Chemistry in the Martian Atmosphere
作者: Plane J.M.C. ; Carrillo-Sanchez J.D. ; Mangan T.P. ; Crismani M.M.J. ; Schneider N.M. ; Määttänen A.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 3 起始页码: 695
结束页码: 707
语种: 英语
英文关键词: ablation
; cosmic dust
; Mars magnesium layer
; Mars mesospheric clouds
; meteoric metals
Scopus关键词: ablation
; cloud
; geochemistry
; interplanetary dust
; magnesium
; Martian atmosphere
; meteorite
英文摘要: Recent measurements by the Imaging Ultraviolet Spectrograph (IUVS) instrument on NASA's Mars Atmosphere and Volatile EvolutioN mission show that a persistent layer of Mg+ ions occurs around 90 km in the Martian atmosphere but that neutral Mg atoms are not detectable. These observations can be satisfactorily modeled with a global meteoric ablation rate of 0.06 t sol−1, out of a cosmic dust input of 2.7 ± 1.6 t sol−1. The absence of detectable Mg at 90 km requires that at least 50% of the ablating Mg atoms ionize through hyperthermal collisions with CO2 molecules. Dissociative recombination of MgO+.(CO2)n cluster ions with electrons to produce MgCO3 directly, rather than MgO, also avoids a buildup of Mg to detectable levels. The meteoric injection rate of Mg, Fe, and other metals—constrained by the IUVS measurements—enables the production rate of metal carbonate molecules (principally MgCO3 and FeCO3) to be determined. These molecules have very large electric dipole moments (11.6 and 9.2 Debye, respectively) and thus form clusters with up to six H2O molecules at temperatures below 150 K. These clusters should then coagulate efficiently, building up metal carbonate-rich ice particles which can act as nucleating particles for the formation of CO2-ice clouds. Observable mesospheric clouds are predicted to occur between 65 and 80 km at temperatures below 95 K and above 85 km at temperatures about 5 K colder. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114382
Appears in Collections: 气候减缓与适应
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作者单位: School of Chemistry, University of Leeds, Leeds, United Kingdom; Laboratory for Atmospheric and Space Physics (LASP), University of Colorado, Boulder, CO, United States; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Guyancourt, France
Recommended Citation:
Plane J.M.C.,Carrillo-Sanchez J.D.,Mangan T.P.,et al. Meteoric Metal Chemistry in the Martian Atmosphere[J]. Journal of Geophysical Research: Planets,2018-01-01,123(3)