Unexpected Long-Term Variability in Jupiter's Tropospheric Temperatures
| Autor: | Orton, Glenn S., Antunano, Arrate, Fletcher, Leigh N., Sinclair, James A., Momary, Thomas W., Fujiyoshi, Takuya, Yanamandra-Fisher, Padma, Donnelly, Padraig T., Greco, Jennifer J., Payne, Anna V., Boydstun, Kimberly A., Wakefield, Laura E. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41550-022-01839-0 |
| Popis: | An essential component of planetary climatology is knowledge of the tropospheric temperature field and its variability. Previous studies of Jupiter hinted at periodic behavior that was non-seasonal, as well as dynamical relationships between tropospheric and stratospheric temperatures. However, these observations were made over time frames shorter than Jupiter's orbit or they used sparse sampling. We derived upper-tropospheric (300-mbar) temperatures over 40 years, extending those studies to cover several orbits of Jupiter, revealing unexpected results. Periodicities of 4, 7 8-9 and 10-14 years were discovered that involved different latitude bands and seem disconnected from seasonal changes in solar heating. Anti-correlations of variability in opposite hemispheres were particularly striking at 16, 22 and 30 degrees from the equator. Equatorial temperature variations are also anticorrelated with those 60-70 km above. Such behavior suggests a top-down control of equatorial tropospheric temperatures from stratospheric dynamics. Realistic future global climate models must address the origins of these variations in preparation for their extension to a wider array of gas-giant exoplanets. Comment: Primary file: 16 pages, 5 figures. Supplemental File (attached): 12 pages, 3 figures, 1 table |
| Databáze: | arXiv |
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