Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL078157 |
Thermal Emission From Saturn's Polar Cyclones | |
Achterberg, R. K.1,2; Flasar, F. M.2; Bjoraker, G. L.2; Hesman, B. E.3; Gorius, N. J. P.4; Mamoutkine, A. A.5,6; Fletcher, L. N.7; Segura, M. E.1; Edgington, S. G.8; Brooks, S. M.8 | |
2018-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:11页码:5312-5319 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | We have used data from the Cassini Composite Infrared Spectrometer to map the temperatures in Saturn's polar cyclones at the highest spatial resolution obtained during the Cassini mission. We find temperature contrasts of 7K in the upper troposphere within 1.4 degrees of both poles, roughly 50 percent larger than earlier measurements at lower spatial resolution. The polar hot spots weaken with depth, disappearing near 500 mbar. In the stratosphere, the polar hot spot becomes broader, extending 4 degrees from the poles, and weakens with altitude disappearing near 1mbar. A thermal relaxation model shows that the tropospheric hot spot is consistent with adiabatic heating from subsidence with a vertical velocity of about -0.05mm/s above 500mbar. The observed temperature gradients imply that the winds in the polar cyclone decay with increasing altitude over roughly three pressure scale heights above the 200-mbar level. Plain Language Summary We have used data from the Composite Infrared Spectrometer to map the temperatures in Saturn's polar cyclones during the Cassini mission. The final orbits of the mission enabled the highest spatial resolution data (20km) of the mission. The analysis of this data reveals temperature contrasts of 7 degrees C (11 degrees F) in the upper troposphere within 1.4 degrees of both poles which is roughly 50% larger than measurements taken at lower spatial resolution earlier in the mission. We find that the polar hot spot temperature contrast weakens with depth in the troposphere. It was discovered that the hot spot temperature contrast in the stratosphere is broader than seen in the troposphere and weakens with increased altitude. The tropospheric temperature contrasts can be explained by slowly descending vertical winds at a rate of 0.05mm/s. We observed that the temperature gradients are consistent with rapidly decaying winds over increasing altitude at the tropopause. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000436249900011 |
WOS关键词 | ROTOTRANSLATIONAL ABSORPTION-SPECTRA ; COMPOSITE INFRARED SPECTROMETER ; PARA-HYDROGEN FRACTION ; OUTER PLANETS ; VORTEX ; ATMOSPHERES ; DYNAMICS ; PAIRS ; TEMPERATURES ; EVOLUTION |
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/28521 |
专题 | 气候变化 |
作者单位 | 1.Univ Maryland, Dept Anat, College Pk, MD 20742 USA; 2.NASA, Goddard Space Flight Ctr, Planetary Syst Lab, Greenbelt, MD USA; 3.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA; 4.Catholic Univ Amer, Dept Mech Engn, Washington, DC 20064 USA; 5.ADNET Syst Inc, Bethesda, MD USA; 6.Univ Maryland, Dept Astron, College Pk, MD 20742 USA; 7.Univ Leicester, Dept Phys & Astron, Leicester, Leics, England; 8.CALTECH, Jet Prop Lab, Pasadena, CA USA |
推荐引用方式 GB/T 7714 | Achterberg, R. K.,Flasar, F. M.,Bjoraker, G. L.,et al. Thermal Emission From Saturn's Polar Cyclones[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(11):5312-5319. |
APA | Achterberg, R. K..,Flasar, F. M..,Bjoraker, G. L..,Hesman, B. E..,Gorius, N. J. P..,...&Brooks, S. M..(2018).Thermal Emission From Saturn's Polar Cyclones.GEOPHYSICAL RESEARCH LETTERS,45(11),5312-5319. |
MLA | Achterberg, R. K.,et al."Thermal Emission From Saturn's Polar Cyclones".GEOPHYSICAL RESEARCH LETTERS 45.11(2018):5312-5319. |
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