Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..308f&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.308
Computer Science
Scientific paper
A global climate model of Titan's atmosphere (Friedson et al. 2009, Pl. Sp. Sci. 57, 1931) is used to investigate the processes controlling development of atmospheric superrotation at low latitudes during the initial spin-up phase. Superrotation at low latitudes is first established in a shallow layer situated at the top of the planetary boundary layer. Over time the superrotating layer is seen to thicken as progressively higher altitudes are accelerated. The development of the superrotation is accompanied by the appearance of a global scale, wavenumber-1 wave which transports zonal angular momentum toward the equator in each hemisphere. The equatorward eddy flux of angular momentum peaks at mid-latitudes near the 500 mbar level in the model, just above the boundary layer, and this level remains stationary as the layer thickens. It thus appears that the thickening of the layer is primarily caused by vertical advection of zonal angular momentum by the low-latitude Hadley circulation, rather than by any significant change in the altitude of maximum eddy transport of angular momentum. The meridional structure and symmetry of the eddy velocity fields associated with the global wave have the character of a westward propagating Rossby-Haurwitz rotational mode of meridional index 2, but the zonal mean potential vorticity gradient that acts as a restoring force for the wave is more likely associated with the latitudinal structure of the zonal mean wind than with the planetary vorticity. The dispersion properties of the wave and their relationship to the background potential vorticity structure will be discussed at the meeting. This research is supported by a grant from the NASA Planetary Atmospheres Program.
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