Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1536c&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1536
Computer Science
Scientific paper
We investigate the effects of imposing the traditional approximation restriction in large-scale atmospheric flow models of exoplanets. In the traditional hydrostatic primitive equations, solved by general circulation and global climate models, terms associated with the horizontal components of the Coriolis acceleration and the metric terms are omitted. However, scale analysis suggests that the neglected terms may be up to 20% of the included terms in the traditional equations. In this work, we enhance a well-tested general circulation model to include the omitted terms consistently. In direct comparisons of simulations appropriate for hot extrasolar giant planets, we demonstrate a significant difference when the terms normally neglected in the approximation are retained; for example, large warm/cool regions (of up to 300K) persist and large-scale jets disappear. The effect is most prominent when rotation does not strongly suppress vertical motion, as in most close-in exoplanets. It is also prominent during the early stages of any planet simulation, in which the atmosphere/climate is spun up from rest.
Cho James Y-K.
Polichtchouk I.
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