Models of venus atmosphere

Sebastien Lebonnois, Christopher Lee, Masaru Yamamoto, Jonathan Dawson, Stephen R. Lewis, Joao Mendonca, Peter Read, Helen F. Parish, Gerald Schubert, Lennart Bengtsson, David Grinspoon, Sanjay S. Limaye, Hauke Schmidt, Håkan Svedhem, Dimitri V. Titov

Research output: Chapter in Book/Report/Conference proceedingChapter

20 Citations (Scopus)

Abstract

In the context of an International Space Science Institute (ISSI) working group, we have conducted a project to compare the most recent General Circulation Models (GCMs) of the Venus atmospheric circulation. A common configuration has been decided, with simple physical parametrization for the solar forcing and the boundary layer scheme. Six models have been used in this intercomparison project. The nominal simulation was run for more than 200 Venus days, and additional sensitivity runs have been done by several models to test the trends visible in these models when parameters are varied: topography, upper and lower boundary conditions, horizontal and vertical resolution, initial conditions. The results show that even in very similar modeling conditions, the wind speeds obtained with the different GCMs are widely different. Super-rotation is obtained, but the shape (with or without marked high-latitude jets) and amplitude of the maximum zonal wind jet is different from one model to the other, from 15 to 50m/s. Minor sensitivity is seen in several models to the upper boundary conditions, the topography or the vertical grid. Horizontal resolution and lower boundary conditions induce variations that are significant, affecting the amplitude and shape of the region of maximum zonal wind. Two models were started from an atmosphere already in super-rotation. The simulations did not converge back to the nominal simulations, maintaining maximum zonal winds over 70m/s (and even 100 m/s) without marked high-latitude jets. This study shows how sensitive GCMs are to the weak forcing of Venus atmosphere, and how difficult it is to draw precise conclusions on the circulation obtained with a single model, as well as on its sensitivity to some parameters.

Original languageEnglish
Title of host publicationTowards Understanding the Climate of Venus
Subtitle of host publicationApplications of Terrestrial Models to Our Sister Planet
PublisherSpringer New York
Pages129-156
Number of pages28
Volume11
ISBN (Electronic)9781461450641
ISBN (Print)9781461450634
DOIs
Publication statusPublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Lebonnois, S., Lee, C., Yamamoto, M., Dawson, J., Lewis, S. R., Mendonca, J., Read, P., Parish, H. F., Schubert, G., Bengtsson, L., Grinspoon, D., Limaye, S. S., Schmidt, H., Svedhem, H., & Titov, D. V. (2013). Models of venus atmosphere. In Towards Understanding the Climate of Venus: Applications of Terrestrial Models to Our Sister Planet (Vol. 11, pp. 129-156). Springer New York. https://doi.org/10.1007/978-1-4614-5064-1_8