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DOI | 10.1029/2018GL081124 |
Atmospheric Waves and Their Possible Effect on the Thermal Structure of Saturn's Thermosphere | |
Mueller-Wodarg, I. C. F.1; Koskinen, T. T.2; Moore, L.3; Serigano, J.4; Yelle, R. V.2; Horst, S.4; Waite, J. H.5; Mendillo, M.3 | |
2019-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:5页码:2372-2380 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Atmospheric waves have been discovered for the first time in Saturn's neutral upper atmosphere (thermosphere). Waves may be generated from instabilities, convective storms or other atmospheric phenomena. The inferred wave amplitudes change little with height within the sampled region, raising the possibility of the waves being damped, which in turn may enhance the eddy friction within the thermosphere. Using our Saturn Thermosphere Ionosphere General Circulation Model, we explore the parameter space of how an enhanced Rayleigh drag in different latitude regimes would affect the global circulation pattern within the thermosphere and, in turn, its global thermal structure. We find that Rayleigh drag of sufficient magnitude at midlatitudes may reduce the otherwise dominant Coriolis forces and enhance equatorward winds to transport energy from poles toward the equator, raising the temperatures there to observed values. Without this Rayleigh drag, energy supplied into the polar upper atmosphere by magnetosphere-atmosphere coupling processes remains trapped at high latitudes and causes low-latitude thermosphere temperatures to remain well below the observed levels. Our simulations thus suggest that giant planet upper atmosphere global circulation models need to include additional Rayleigh drag in order to capture the effects of physical processes otherwise not resolved by the codes. Plain Language Summary Atmospheric waves have been discovered for the first time in Saturn's neutral upper atmosphere (thermosphere) with typical vertical wavelengths ranging from 100-200 km and density amplitudes reaching around 10%. Amplitudes are roughly constant over this height range, implying that wave damping occurs, which in turn is expected to enhance eddy friction (Rayleigh drag) within the thermosphere. Using the Saturn Thermosphere Ionosphere General Circulation Model (STIM), we explore the response of Saturn's thermosphere to a range of possible Rayleigh drag profiles. We find that the introduction of momentum dissipation equatorward of 60 degrees latitude will slow down the zonal winds on Saturn sufficiently to enhance equatorward winds and thereby allow energy propagation from the poles toward the equator. Under the assumption that sufficiently strong Rayleigh drag is present in Saturn's thermosphere, large temperatures at low latitudes may result from wind-driven global redistribution of energy from the polar regions. |
英文关键词 | Saturn thermosphere waves temperatures dynamics energy crisis |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462612900006 |
WOS关键词 | JUPITERS THERMOSPHERE ; GRAVITY-WAVES ; GLOBAL CIRCULATION ; VENUS MESOSPHERE ; MAGNETOSPHERE ; IONOSPHERE ; MODEL ; TEMPERATURE ; DISSIPATION ; DYNAMICS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181596 |
专题 | 气候变化 |
作者单位 | 1.Imperial Coll London, Blackett Lab, London, England; 2.Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA; 3.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 4.Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA; 5.Southwest Res Inst, San Antonio, TX USA |
推荐引用方式 GB/T 7714 | Mueller-Wodarg, I. C. F.,Koskinen, T. T.,Moore, L.,et al. Atmospheric Waves and Their Possible Effect on the Thermal Structure of Saturn's Thermosphere[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(5):2372-2380. |
APA | Mueller-Wodarg, I. C. F..,Koskinen, T. T..,Moore, L..,Serigano, J..,Yelle, R. V..,...&Mendillo, M..(2019).Atmospheric Waves and Their Possible Effect on the Thermal Structure of Saturn's Thermosphere.GEOPHYSICAL RESEARCH LETTERS,46(5),2372-2380. |
MLA | Mueller-Wodarg, I. C. F.,et al."Atmospheric Waves and Their Possible Effect on the Thermal Structure of Saturn's Thermosphere".GEOPHYSICAL RESEARCH LETTERS 46.5(2019):2372-2380. |
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