Other
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3202806y&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 2, CiteID L02806
Other
2
Atmospheric Processes: Convective Processes, Atmospheric Processes: Mesoscale Meteorology, Atmospheric Processes: Polar Meteorology
Scientific paper
High-resolution numerical experiments using a three-dimensional non-hydrostatic model with horizontal grid size of 5 or 2 km are performed to clarify what determines the structure and cloud pattern of polar lows. An axisymmetric initial vortex is imposed in a baroclinic basic state for which thermal wind balance holds. It is found that when the baroclinicity is absent, a hurricane-like vortex with spiral cloud bands, a cloud-free eye, and a warm core develops. When the baroclinicity is strong, on the other hand, a vortex with a comma-shaped cloud and slightly larger horizontal scale develops. The former appears to develop due to CISK/WISHE mechanism, while the latter due to baroclinic instability modified by latent heating.
Niino Hiroshi
Yanase Wataru
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