Insolation in Titan’s troposphere |
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| Authors: | Juan M Lora Paul J Goodman Joellen L Russell Jonathan I Lunine |
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| Institution: | aLunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, USA;bDepartment of Geosciences, University of Arizona, 1040 E 4th St., Tucson, AZ 85721, USA |
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| Abstract: | Seasonality in Titan’s troposphere is driven by latitudinally varying insolation. We show that the latitudinal distributions of insolation in the troposphere and at the surface, based on Huygens DISR measurements, can be approximated analytically with nonzero extinction optical depths τ, and are not equivalent to that at the top of the atmosphere (τ = 0), as has been assumed previously. This has implications for the temperature distribution and the circulation, which we explore with a simple box model. The surface temperature maximum and the upwelling arm of thermally-direct meridional circulation reach the midlatitudes, not the poles, during summertime. |
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| Keywords: | Titan Radiative transfer |
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