| DOI: | 10.1029/2012GL053873
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| 论文题名: | Inferring the depth of the zonal jets on Jupiter and Saturn from odd gravity harmonics |
| 作者: | Kaspi Y.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9308
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| EISSN: | 1944-9039
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| 出版年: | 2013
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| 卷: | 40, 期:4 | | 起始页码: | 676
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| 结束页码: | 680
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| 语种: | 英语
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| 英文关键词: | Cassini
; Juno
; Jupiter
; Saturn
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| Scopus关键词: | Climatology
; Gravitation
; Interplanetary flight
; NASA
; Planets
; Wind
; Atmospheric circulation
; Cassini
; Juno
; Jupiters
; North-south asymmetry
; Radial density distribution
; Saturn
; Spacecraft encounters
; Harmonic analysis
; atmospheric circulation
; gravity field
; harmonic analysis
; jet flow
; Jupiter
; Saturn
; sensitivity analysis
; spacecraft
; wind field
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| 英文摘要: | The low-order even gravity harmonics J2, J4, and J6 are well constrained for Jupiter and Saturn from spacecraft encounters over the past few decades. These gravity harmonics are dominated by the oblate shape and radial density distribution of these gaseous planets. In the lack of any north-south asymmetry, odd gravity harmonics will be zero. However, the winds on these planets are not hemispherically symmetric, and therefore can contribute to the odd gravity harmonics through dynamical variations to the density field. Here it is shown that even relatively shallow winds (reaching ~ 40 bars) can cause considerable odd gravity harmonics that can be detectable by NASA's Juno and Cassini missions to Jupiter and Saturn. Moreover, these measurements will have better sensitivity to the odd harmonics than to the high-order even harmonics, which have been previously proposed as a proxy for deep winds. Determining the odd gravity harmonics will therefore help constrain the depth of the jets on these planets, and may provide valuable information about the planet's core and structure. Key Points Measurable odd harmonics due to atmospheric circulation exist on giant planets Odd harmonics provide a pure dynamical gravity signal (no solid-body component) Juno/Cassini will have better sensitivity to odd harmonics than high even ones ©2012. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84875904624&doi=10.1029%2f2012GL053873&partnerID=40&md5=caae659d1f192c6533cacfe3ffb12a7b
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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/6572
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Environmental Sciences, Center for Planetary Science, Weizmann Institute of Science, Rehovot, 76100, Israel
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| Recommended Citation: | |
Kaspi Y.. Inferring the depth of the zonal jets on Jupiter and Saturn from odd gravity harmonics[J]. Geophysical Research Letters,2013-01-01,40(4).
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