Thermal balance of the lower Venus atmosphere: radiative and dynamical effects

Details Thermal balance of the lower Venus atmosphere: radiative and dynamical effects Thermal balance of the lower Venus atmosphere: radiative and dynamical effects

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13301a&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13301

Physics

Scientific paper

The current state and recent evolution of Venus climate is believed to be controlled by greenhouse effect variations in response to modified composition of the atmosphere. The quantitative assessment of the thermal regime of the lower Venus atmosphere is, however, highly complicated due to major uncertaintues in its spectral properties, in particular, spectral line profile, which shape is dependent on temperature, pressure, and specific molecular transition. We present a comprehensive, high-resolution model of the thermal radiation and 1D calculations of the thermal balance, involving both radiative and dynamical heat transfer. Spectroscopic model is based on the war-wing approximation for molecular absorption, and self-consistent micorphysical model of the cloud layer. In the lower atmospheric layers simulated radiative fluxes are concentrated within the windows in between absorption bands and reveal high sensitivity to the far-wing spectral line formfactor. Radiation flux effectively generated at 30-40 km is absorbed at the lower boundary of the cloud deck, with the excess heat being removed by convection and large-scale circulation. Sensitivities of the thermal state and dynamical fluxes to minor constituents and aerosol properties are explored. This work has been supported by RFBR grant #01-02-17481

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