Solid-body rotation in the northern hemisphere summer stratosphere

Details Solid-body rotation in the northern hemisphere summer stratosphere Solid-body rotation in the northern hemisphere summer stratosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..32p&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 32-1, CiteID 2117, DOI 10.1029/2002GL016079

Physics

1

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342), Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics

Scientific paper

The summer stratospheric flow is analysed in three years of ECMWF analyses. By diagnosing the angular rotation, it is shown that the summer stratospheric flow is close to solid-body rotation for latitudes north of 30° with the rate of rotation increasing approximately linearly with height. This flow configuration is not in the radiatively determined state. The winds in thermal wind balance with the radiatively determined temperatures are unstable to barotropic/baroclinic instability. Small amplitude waves are diagnosed in the ECMWF analyses with periods of 5-10 days. These may drive the flow away from the radiatively determined state and lock the flow in the upper stratosphere into near solid-body rotation.

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