A heat engine based moist convection parametrization for Jupiter |
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| Authors: | LC Zuchowski PL Read NO Renno |
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| Institution: | a University of Oxford, Department of Atmospheric, Oceanic and Planetary Physics, Clarendon Laboratory, OX1 3PU Oxford, UK
b University of Michigan, Department of Atmospheric, Oceanic and Space Sciences, Space Research Building University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109-2143, USA |
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| Abstract: | We have developed a parametrization of Jovian moist convection based on a heat engine model of moist convection. In comparison to other moist convection schemes, this framework allows the computation of the total available convective energy TCAPE and the corresponding mass flux M as dynamic variables from the mean atmospheric state. The effects of this parametrization have been investigated both analytically and numerically. In agreement with previous numerical experiments and observations, the inclusion of moist convection leads to heat and water vapor transport from the water condensation level into higher altitudes. The time development of the modeled convective events was found to be strongly influenced by a rapid reduction of kinetic energy and a subsequent lowering of the cumulus tower's top in response to convective heating. We have tested the sensitivity of the scheme to different variations in the fractional cloud coverage and under the inclusion of external radiative forcing towards a stable/unstable temperature profile. While the time development of convective events differs in response to these variations, the general moist convective heating and moistening of the upper troposphere was a robust feature observed in all experiments. |
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| Keywords: | Jovian planets Jupiter Atmospheric dynamics Moist convection |
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