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| Titel |
Long-Term Time Variability of Thermal Emission in Jupiter |
| VerfasserIn |
Glenn Orton, Leigh Fletcher, Brendan Fisher, Padma Yanamandra-Fisher, Thomas Greathouse, James Sinclair, Jennifer Greco, Kimberly Boydstun, Laura Wakefield, Sonia Kim, Takuya Fujiyoshi |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102764
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| Publikation (Nr.) |
 EGU/EGU2015-2163.pdf |
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| Zusammenfassung |
| Mid-infrared images of Jupiter’s thermal emission in discrete filters between 4.8 and 24.5 μm
from 1996 to the present day, spanning over a Jovian year, enable time-domain studies of its
temperature field, minor-constituent distribution and cloud properties. The behavior of
stratospheric (~10-mbar) and upper-tropospheric (~100-400 mbar) temperatures is
generally consistent with predictions of seasonal variability. There also appear to be
long-term periodicities of tropospheric temperatures, with meridionally dependent
amplitudes, phases and periods. Temperatures near and south of the equator vary the
least. During the “global upheaval” or the corresponding “revival” events that have
produced dramatic changes in Jupiter’s visible appearance and cloud cover, there
were few large-scale variations of zonal mean temperatures in the stratosphere or
troposphere, although there are colder discrete regions associated with the updraft
events that marked the early stages of revivals. Changes in visible albedo during
the upheavals are accompanied by increases in cloudiness at 700 mbar and higher
pressures, along with increases in the ammonia-gas mixing ratio. In contrast to all
these changes, the meridional distribution of the 240-mbar para-hydrogen fraction
appears to be time-invariant. Jupiter also exhibits prominent temperature waves in
both the upper troposphere and stratosphere that move slowly westward in System
III.
J. Sinclair is supported by a NASA Postdoctoral Program fellowship; J. Greco, K.
Boydstun, L. Wakefield and S. Kim were supported by Caltech Summer Undergraduate
Research Fellowships while resident at JPL. |
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