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| Titel |
Analysis of the radiative budget of Venus atmosphere based on infrared Net Exchange Rate formalism |
| VerfasserIn |
Sébastien Lebonnois, Vincent Eymet, Christopher Lee, Jan Vatant d'Ollone |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103990
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| Publikation (Nr.) |
 EGU/EGU2015-3412.pdf |
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| Zusammenfassung |
| Taking advantage of the Net Exchange Rate formalism we use for the infrared radiative
transfer in the atmosphere of Venus, a detailed analysis of the energy exchanges is proposed
here. Balance between solar heating and infrared energy exchanges is analysed for each
region: upper atmosphere (from cloud top to 100 km), upper cloud, middle cloud, cloud
base, and deep atmosphere (cloud base to surface). All solar energy absorbed below the
clouds are reaching the cloud base through infrared windows, mostly at 3-4Âμm and
5-7Âμm. The continuum opacity in these spectral regions is not well known for
the hot temperatures and large pressures of Venus deep atmosphere, but strongly
affects the temperature profile from cloud base to surface. From cloud base, upward
transport of energy goes through convection and short-range exchanges up to the
middle cloud where the atmosphere is thin enough in the 20-30Âμm window to
cool directly to space. Total opacity in this spectral window between the 15Âμm
CO2 band and the CO2 collision induced absorption has a strong impact on the
temperature above the cloud convective layer. We will present how sensitive the
temperature profile is to uncertainties in gas opacity and discuss the chosen cloud
model and solar flux deposition profile that we use for our latest GCM simulations. |
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