CHANGES TO SATURN'S ZONAL-MEAN TROPOSPHERIC THERMAL STRUCTURE AFTER THE 2010-2011 NORTHERN HEMISPHERE STORM

We use far-infrared (20-200 mu m) data from the Composite Infrared Spectrometer on the Cassini spacecraft to determine the zonal-mean temperature and hydrogen para-fraction in Saturn's upper troposphere from observations taken before and after the large northern hemisphere storm in 2010-2011. D...

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Bibliographic Details
Published in:The Astrophysical journal 2014-05, Vol.786 (2), p.1-8
Main Authors: Achterberg, R K, Gierasch, P J, Conrath, B J, Fletcher, L N, Hesman, B E, Bjoraker, G L, Flasar, F M
Format: Article
Language:English
Subjects:
APPROXIMATIONS
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Cassini mission
Clouds
FAR INFRARED RADIATION
HYDROGEN
INFRARED SPECTROMETERS
Latitude
NORTHERN HEMISPHERE
PLUMES
SATELLITE ATMOSPHERES
SATELLITES
SATURN PLANET
Spacecraft
STORMS
TROPOSPHERE
WATER
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Summary:We use far-infrared (20-200 mu m) data from the Composite Infrared Spectrometer on the Cassini spacecraft to determine the zonal-mean temperature and hydrogen para-fraction in Saturn's upper troposphere from observations taken before and after the large northern hemisphere storm in 2010-2011. During the storm, zonal mean temperatures in the latitude band between approximately 25[degrees]N and 45[degrees]N (planetographic latitude) increased by about 3 K, while the zonal mean hydrogen para-fraction decreased by about 0.04 over the same latitudes, at pressures greater than about 300 mbar. These changes occurred over the same latitude range as the disturbed cloud band seen in visible images. The observations are consistent with low para-fraction gas being brought up from the level of the water cloud by the strong convective plume associated with the storm, while being heated by condensation of water vapor, and then advected zonally by the winds near the plume tops in the upper troposphere.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/786/2/92