[P-PS01_30PM2] Toward JUICE and future explorations of outer solar system

5:00 PM - 5:15 PM JST(8:00 AM - 8:15 AM UTC)

[PPS01-10] Simulated radiative forcing by molecules in Jupiter's stratosphere

*Takeshi KURODA¹, Alexander MEDVEDEV², Paul HARTOGH² (1.Tohoku Univ., 2.MPS)

Keywords:

Jupiter,atmospheric radiation,gas giants,JUICE

We present the radiative heating and cooling rates by molecules for Jupiter's upper troposphere and stratosphere (10³ to 10^-3 hPa) with a newly developed parameterization which is suitable for general circulation models. The scheme is a band model based on the correlated k-distribution approach, which accounts for the heating due to absorption of solar radiation by CH₄, and cooling in the infrared by C₂H₆, C₂H₂, CH₄ and collision-induced transitions of H₂-H₂ and H₂-He. The band model achieved the accuracy of within 10% in comparison with the line-by-line calculations. We show the sensitivity of the heating/cooling rates due to variations of the mixing ratios of hydrocarbon molecules calculated with this scheme, in addition to the calculated radiative-convective equilibrium temperature which is in agreement with observations in the equatorial region. Our results suggest that the radiative forcing in the upper stratosphere is much stronger than it was thought before [Conrath et al., 1990]. In particular, the characteristic radiative relaxation time decreases exponentially with height from 10⁸ s near the tropopause to 10⁵ s in the upper stratosphere.