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Photochemical escape of atomic C and N on Mars: clues from a multi-instrument MAVEN dataset
Cui, J.1,2,3; Wu, X. -S.2; Gu, H.4; Jiang, F. -Y.2; Wei, Y.5
2018-12-21
发表期刊ASTRONOMY & ASTROPHYSICS
ISSN1432-0746
卷号621页码:8
摘要Context. Photochemical escape of hot atoms is crucial to the long-term evolution of the Martian climate. For atomic C and N, photochemical escape is primarily driven by photodissociation (PD) of CO and N-2. Aims. Combining the Mars Atmosphere and Volatile Evolution (MAVEN) measurements of atmospheric neutral densities and solar EUV/X-ray irradiance, we perform a state-of-the-art analysis of atomic C and N escape on Mars. Methods. For each MAVEN orbit, we calculated the hot C and N production rates in the dayside Martian upper atmosphere via PD, from which the escape rates are estimated using a simplified technique to parameterize the respective escape probabilities taking into account multiple collisions with ambient neutrals. Results. The mean C and N escape rates are 1 x 10(24) s(-1) and 9 x 10(24) s(-1), appropriate for low to moderate solar activity conditions, and thermospheric PD makes a larger contribution to the total N escape than to the total C escape. The above differences highlight the importance of nascent energy, with more energetic nascent escaping atoms able to survive collisions with ambient neutrals more easily, thus extending down to deeper regions of the atmosphere. Solar cycle variation in C and N escape is revealed by our analysis, whereas solar zenith angle variation is absent for both species. These results could be explained by the fact that the production of nascent escaping atoms responds to varying solar illumination angle at low altitudes where the escape probability is negligible, but responds to varying level of solar EUV/X-ray irradiance at high altitudes where the atmosphere is essentially collisionless.
关键词planets and satellites: individual: Mars planets and satellites: atmospheres
DOI10.1051/0004-6361/201833749
资助者National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT)
关键词[WOS]HOT OXYGEN ; DISSOCIATIVE RECOMBINATION ; UPPER-ATMOSPHERE ; CROSS-SECTIONS ; NITROGEN-ATOMS ; IONOSPHERE ; CARBON ; DISTRIBUTIONS ; EXCITATION ; EVOLUTION
语种英语
资助项目National Science Foundation of China (NSFC)[41525015] ; National Science Foundation of China (NSFC)[41774186] ; National Science Foundation of China (NSFC)[41525016] ; Science and Technology Development Fund of Macau SAR (FDCT)[039/2013/A2] ; Science and Technology Development Fund of Macau SAR (FDCT)[082/2015/A3]
资助者National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT) ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Science and Technology Development Fund of Macau SAR (FDCT) ; Science and Technology Development Fund of Macau SAR (FDCT)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000454402800001
出版者EDP SCIENCES S A
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90226
专题地球与行星物理院重点实验室
通讯作者Cui, J.
作者单位1.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Peoples R China
2.Chinese Acad Sci, Key Lab Lunar & Deep Space Explorat, Natl Astron Observ, Beijing, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China
4.Macau Univ Sci & Technol, Space Sci Inst, Macau, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
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Cui, J.,Wu, X. -S.,Gu, H.,et al. Photochemical escape of atomic C and N on Mars: clues from a multi-instrument MAVEN dataset[J]. ASTRONOMY & ASTROPHYSICS,2018,621:8.
APA Cui, J.,Wu, X. -S.,Gu, H.,Jiang, F. -Y.,&Wei, Y..(2018).Photochemical escape of atomic C and N on Mars: clues from a multi-instrument MAVEN dataset.ASTRONOMY & ASTROPHYSICS,621,8.
MLA Cui, J.,et al."Photochemical escape of atomic C and N on Mars: clues from a multi-instrument MAVEN dataset".ASTRONOMY & ASTROPHYSICS 621(2018):8.
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