Lower-Stratospheric Radiative Damping and Polar-Night Jet Oscillation Events
نویسندگان
چکیده
منابع مشابه
Lower-Stratospheric Radiative Damping and Polar-Night Jet Oscillation Events
The effect of stratospheric radiative damping time scales on stratospheric variability and on stratosphere– troposphere coupling is investigated in a simplified global circulation model by modifying the vertical profile of radiative damping in the stratosphere while holding it fixed in the troposphere. Perpetual-January conditions are imposed, with sinusoidal topography of zonal wavenumber 1 or...
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A novel diagnostic tool is presented, based on polar-cap temperature anomalies, for visualizing daily variability of the Arctic stratospheric polar vortex over multiple decades. This visualization illustrates the ubiquity of extended-time-scale recoveries from stratospheric sudden warmings, termed here polar-night jet oscillation (PJO) events. These are characterized by an anomalously warm pola...
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Observations made with the co-located Rayleigh lidar and MST radar systems at Aberystwyth (52.4°N, 4.1°W) in Wales and radiosondes from Valentia (51.9°N, 10.2°W) in Eire are used to investigate the changes in the vertical propagation of gravity waves during periods of 4 days in June 1995 and February 1993. In each month, the lidar observations show that the wave activity in the upper stratosphe...
متن کاملZonal-Mean Dynamics of Extended Recoveries from Stratospheric Sudden Warmings
The recovery of theArctic polar vortex following stratospheric suddenwarmings is found to take upward of 3 months in a particular subset of cases, termed here polar-night jet oscillation (PJO) events. The anomalous zonal-mean circulation above the pole during this recovery is characterized by a persistently warm lower stratosphere, and above this a cold midstratosphere and anomalously high stra...
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ژورنال
عنوان ژورنال: Journal of the Atmospheric Sciences
سال: 2013
ISSN: 0022-4928,1520-0469
DOI: 10.1175/jas-d-12-0193.1