| DOI: | 10.1002/2015GL066043
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| 论文题名: | Enhanced carbon dioxide causing the dust storm-related increase in high-altitude photoelectron fluxes at Mars |
| 作者: | Xu S.; Liemohn M.; Bougher S.; Mitchell D.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8390
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| EISSN: | 1944-8121
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| 出版年: | 2015
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| 卷: | 42, 期:22 | | 起始页码: | 9702
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| 结束页码: | 9710
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| 语种: | 英语
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| 英文关键词: | dust storms
; electrons
; Mars
; photoelectron
; superthermal electron transport
; thermospheric composition
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| Scopus关键词: | Carbon
; Carbon dioxide
; Dust
; Electron transport properties
; Electrons
; Photoelectrons
; Photons
; Composition changes
; Dust storm
; Mars
; Mars global surveyor
; Martian global dust storms
; Neutral atmosphere
; Superthermal electrons
; Thermospheric composition
; Storms
; altitude
; carbon dioxide
; dust storm
; electron
; flux measurement
; instrumentation
; Martian atmosphere
; spatiotemporal analysis
; thermosphere
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| 英文摘要: | Several studies have shown that the Martian global dust storm occurred in 2001 had a long-term influence on high-altitude photoelectron fluxes by analyzing the observations of the magnetometer/electron reflectometer instrument on board Mars Global Surveyor, most likely because the dust altered the neutral atmosphere in a significant way in terms of photoelectron production and loss. This study investigates candidate atmospheres that can replicate observations, especially focusing on the role that thermospheric composition and density play in high-altitude photoelectrons. Through the simulations of our SuperThermal Electron Transport model, it is found that high-altitude photoelectron fluxes at more field-aligned pitch angles are very sensitive to composition change and surprisingly independent of density. For more perpendicular pitch angles, both composition and density take part in determining photoelectron fluxes. Also, a CO2 atmosphere is the only one of the tested atmospheres that can qualitatively match the observation, which suggests that the global dust storm might have altered the photoelectron fluxes via causing CO2 to be the dominant species at a much larger altitude range than usual. Key Points High-altitude photoelectron fluxes are very sensitive to atmosphere composition change High-altitude photoelectron is also independent of neutral density at PA ∼0 Global dust storm in 2001 probably caused CO2 dominating a larger altitude range. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956895112&doi=10.1002%2f2015GL066043&partnerID=40&md5=23c6ccd3af2c5dd6594b30d149755c6f
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8006
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States
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| Recommended Citation: | |
Xu S.,Liemohn M.,Bougher S.,et al. Enhanced carbon dioxide causing the dust storm-related increase in high-altitude photoelectron fluxes at Mars[J]. Geophysical Research Letters,2015-01-01,42(22).
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