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Temperature Variability in Titan's Upper Atmosphere: The Role of Wave Dissipation
Wang, Xing1,2; Lian, Yuan3; Cui, Jun4,5; Richardson, Mark3; Wu, Zhaopeng4,5; Li, Jing4
2020-06-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
ISSN2169-9097
Volume125Issue:6Pages:14
AbstractThe Cassini spacecraft detected a surprisingly large temporal temperature variability of 60 Kin Titan's upper atmosphere during multiple flybys. Previous efforts examining such a variability focused on the role of radiative heating but were unable to explain the observations. Analytic estimates of the wave energy fluxes have suggested that wave heating might be an important process affecting the thermal structure of the upper atmosphere. However, approaches to date have been highly idealized and have not described wave propagation rigorously. Here, we implement an anelastic linearized wave model adopting the Wentzel-Kramers-Brillouin approximation that adequately describes wave propagation in Titan's upper atmosphere, where the observed vertical wavelengths are several times larger than the density scale height. Our results show that the wave heating and cooling rates generated by molecular diffusion of monochromatic waves are larger than those found in previous studies. The energy fluxes associated with wave dissipation can exceed that of the combined solar extreme ultraviolet (EUV) heating and HCN rotational line cooling. Compared to the wave-free, mean-state temperature, the wave energy fluxes associated with certain wave modes can produce a temperature variability as large as 20 K, which is larger than that driven by magnetospheric particle precipitation but still smaller than that observed. Our results suggest that wave heating and cooling are important processes that can modify the thermal structure of Titan's upper atmosphere and also suggest that additional processes such as wave breaking and molecular diffusion of a spectrum of waves should be considered in future studies.
KeywordTitan's atmosphere Gravity waves
Funding OrganizationB-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China ; B-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China ; B-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China ; B-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China
DOI10.1029/2019JE006163
WOS KeywordGRAVITY-WAVE ; JUPITERS THERMOSPHERE ; THERMAL STRUCTURE ; DIFFUSION ; STRESS
Language英语
Funding ProjectB-type Strategic Priority Program - Chinese Academy of Sciences[XDB41000000] ; pre-research project on Civil Aerospace Technologies - China's National Space Administration[D020105] ; National Science Foundation of China[41525015] ; National Science Foundation of China[41774186]
Funding OrganizationB-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China ; B-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China ; B-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China ; B-type Strategic Priority Program - Chinese Academy of Sciences ; B-type Strategic Priority Program - Chinese Academy of Sciences ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; pre-research project on Civil Aerospace Technologies - China's National Space Administration ; National Science Foundation of China ; National Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000545706100003
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82803
Collection中国科学院国家天文台
Corresponding AuthorCui, Jun
Affiliation1.Chinese Acad Sci, Key Lab Lunar & Deep Space Explorat, Natl Astron Observ, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing, Peoples R China
3.Aeolis Res, Pasadena, CA USA
4.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei, Peoples R China
Recommended Citation
GB/T 7714
Wang, Xing,Lian, Yuan,Cui, Jun,et al. Temperature Variability in Titan's Upper Atmosphere: The Role of Wave Dissipation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2020,125(6):14.
APA Wang, Xing,Lian, Yuan,Cui, Jun,Richardson, Mark,Wu, Zhaopeng,&Li, Jing.(2020).Temperature Variability in Titan's Upper Atmosphere: The Role of Wave Dissipation.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,125(6),14.
MLA Wang, Xing,et al."Temperature Variability in Titan's Upper Atmosphere: The Role of Wave Dissipation".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 125.6(2020):14.
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