Temporal Variation of Saturn's Zonal-Mean Temperatures During the Cassini Prime Mission.

Details Temporal Variation of Saturn's Zonal-Mean Temperatures During the Cassini Prime Mission. Temporal Variation of Saturn's Zonal-Mean Temperatures During the Cassini Prime Mission.

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3501a&link_type=abstract

American Astronomical Society, DPS meeting #40, #35.01; Bulletin of the American Astronomical Society, Vol. 40, p.458

Astronomy and Astrophysics

Astronomy

Scientific paper

During the four years that Cassini has been orbiting Saturn, the Composite Infrared Spectrometer (CIRS) has performed a set of 15 hemispheric mapping sequences of Saturn. In these observations, the CIRS fields-of-view are repeatedly scanned along the central meridian of one hemisphere for one to two rotations of Saturn, and spectra were obtained in the wavenumber range from 600 to 1400 cm-1 at a spectral resolution of 15.5 cm-1 and a spatial resolution between roughly 0.7° and 1.4° of great circle arc. To increase the signal-to-noise, spectra were averaged in bins of 2° in latitude and 4°-20° in longitude, with larger longitude bins in the stratosphere and near the poles. A constrained linear inversion routine was applied to spectra from 600 - 670 cm-1 and 1250-1315 cm-1 to obtain temperatures in the upper troposphere ( 50 - 250 mbar) and mid-stratosphere ( 1-3 mbar).
In the stratosphere, north of 30°N temperatures increased by 6 to 8K between late 2005 and mid 2008, while south of 40°S temperatures decreased by 4K between late 2006 and late 2007. Temperature changes closer to the equator are more complicated. From 10°N to 30°N, temperatures at 1mbar increased by 6K, while temperatures at 2 mbar decreased by 2-6K, from 2005 to 2008. Near-equatorial temperatures were approximately constant from 2004 through 2007, but decreased at 1 mbar (but not 2 mbar) during 2008. The complicated temporal behavior of the temperatures in the equatorial regions is likely associated with the semi-annual oscillation found by Orton et al. (Nature, 453, 196-199, 2008). Temperatures in the upper troposphere show no time variations during the period of observation.

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