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Saturn's emitted power

Li, Liming and Conrath, Barney J. and Gierasch, Peter J. and Achterberg, Richard K. and Nixon, Conor A. and Simon‐Miller, Amy A. and Flasar, F. Michael and Banfield, Don and Baines, Kevin H. and West, Robert A. and Ingersoll, Andrew P. and Vasavada, Ashwin R. and Del Genio, Anthony D. and Porco, Carolyn C. and Mamoutkine, Andrei A. and Segura, Marcia E. and Bjoraker, Gordon L. and Orton, Glenn S. and Fletcher, Leigh N. and Irwin, Patrick G. J. and Read, Peter L. (2010) Saturn's emitted power. Journal of Geophysical Research. Planets, 115 (E11). Art. No. E11002. ISSN 2169-9097.

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Long-term (2004–2009) on-orbit observations by Cassini Composite Infrared Spectrometer are analyzed to precisely measure Saturn's emitted power and its meridional distribution. Our evaluations suggest that the average global emitted power is 4.952 ± 0.035 W m^(−2) during the period of 2004–2009. The corresponding effective temperature is 96.67 ± 0.17 K. The emitted power is 16.6% higher in the Southern Hemisphere than in the Northern Hemisphere. From 2005 to 2009, the global mean emitted power and effective temperature decreased by ~2% and ~0.5%, respectively. Our study further reveals the interannual variability of emitted power and effective temperature between the epoch of Voyager (~1 Saturn year ago) and the current epoch of Cassini, suggesting changes in the cloud opacity from year to year on Saturn. The seasonal and interannual variability of emitted power implies that the energy balance and internal heat are also varying.

Item Type:Article
Related URLs:
URLURL TypeDescription
Li, Liming0000-0002-5257-9849
Ingersoll, Andrew P.0000-0002-2035-9198
Vasavada, Ashwin R.0000-0003-2665-286X
Orton, Glenn S.0000-0001-7871-2823
Additional Information:© 2010 American Geophysical Union. Received 20 April 2010; revised 3 August 2010; accepted 16 August 2010; published 9 November 2010. NASA Outer Planets Research Program funded this work. We acknowledge Santigo Perez‐Hoyos for providing the data of solar flux at the top of Saturn’s atmosphere. We are also grateful for valuable comments and suggestions on this work from two anonymous reviewers.
Funding AgencyGrant Number
Subject Keywords:emitted power; Saturn; internal heat
Issue or Number:E11
Record Number:CaltechAUTHORS:20101208-111536827
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Official Citation:Li, L., et al. (2010), Saturn's emitted power, J. Geophys. Res., 115, E11002, doi:10.1029/2010JE003631
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21241
Deposited By: Tony Diaz
Deposited On:14 Dec 2010 23:25
Last Modified:03 Oct 2019 02:21

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