Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 2, pp. 120-131
Spectral characteristics of atmospheric waves generated by winter stratospheric jet stream in the Northern Hemisphere
B.G. Shpynev
1 , M.A. Chernigovskaya
1 , D.S. Khabituev
1
1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
Accepted: 22.02.2016
DOI: 10.21046/2070-7401-2016-13-2-120-131
We studied the spatial and temporal variations of atmospheric air vertical velocity in the stratosphere and lower mesosphere in the Northern Hemisphere over years 2008–2013. Based on the ECMWF ERA-Interim reanalysis data, we identified periods of middle-scale wave-like motions in the autumn-winter period (between November and February) for all years under analysis. These wave-like motions were associated with jet streams at the stratosphere/lower mesosphere heights and could be sources of atmospheric gravity waves. We studied spatial variations of the vertical velocity for different heights and latitudes. The height variations of the vertical velocity spectra showed that these waves propagated as internal gravity waves above some critical stratosphere height near the stratopause. Below this height the waves decayed as a result of turbulent cascade process. The region of generation of the wave-like motions coincided with the zone of interaction of the jet streams, located at different stratosphere heights.
Keywords: the lower and upper atmosphere, interaction between atmospheric layers, wave disturbances
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