caa a22 4500 469077492 CHVBK 20180323132939.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF02507613 doi (NATIONALLICENCE)springer-10.1007/BF02507613 Variability of planetary-scale waves at mid-latitudes in the course of strat-warmings during DYANA [Elektronische Daten] [G. Cevolani, G. Bortolotti, C. Formiggini, C. Franceschi, S. Gottardi, G. Trivellone] Summary: This work investigates the variability of planetary-scale waves from motion field observations in the middle atmosphere carried out at the Budrio radar station near Bologna (45°N; 12°E) in the 1989-1990 winter during DYANA (DYnamics Adapted Network for the Atmosphere). Meso-thermospheric zonal winds associated with long-period waves give evidence of significant energy input from below mainly in the course of the two strat-warmings recorded at the end of January and in mid February 1990. Amplification of 10-day waves in the upper mesosphere and lower thermosphere just a few days before the temperature peak at the 10hPa stratospheric level, and the effects induced by these waves on tidal and mean fields, are here taken into account to clarify the influence and the evolution of strat-warmings in the middle atmosphere. Nonlinear mixing processes between planetary and tidal oscillations are indicated to be responsible for the short-term variability pointed out in the amplitude variations of tides. Società Italiana di Fisica, 1992 Meteorology nationallicence Cevolani G. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut Bortolotti G. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut Formiggini C. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut Franceschi C. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut Gottardi S. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut Trivellone G. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut Il Nuovo Cimento C Kluwer Academic Publishers 15/2(1992-03-01), 191-201 0390-5551 15:2<191 1992 15 11543 https://doi.org/10.1007/BF02507613 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02507613 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cevolani G. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut NATIONALLICENCE 700 1- Bortolotti G. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut NATIONALLICENCE 700 1- Formiggini C. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut NATIONALLICENCE 700 1- Franceschi C. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut NATIONALLICENCE 700 1- Gottardi S. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut NATIONALLICENCE 700 1- Trivellone G. FISBAT/CNR, via de' Castagnoli 1, 40126, Bologna, Italia aut NATIONALLICENCE 773 0- Il Nuovo Cimento C Kluwer Academic Publishers 15/2(1992-03-01), 191-201 0390-5551 15:2<191 1992 15 11543 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer