caa a22 4500 445302690 CHVBK 20180317142602.0 cr unu---uuuuu 170323e20100801xx s 000 0 eng 10.1134/S0001433810040031 doi (NATIONALLICENCE)springer-10.1134/S0001433810040031 Spectral characteristics of quasi-biennial oscillations of the equatorial stratospheric wind and the problem of synchronization [Elektronische Daten] [D. Kulyamin, V. Dymnikov] Spectral characteristics of the quasi-biennial oscillations (QBO) of the zonal velocity in the equatorial stratosphere are investigated in this work on the basis of data from the NCEP/NCAR and ERA40 reanalyses and numerical experiments with the atmospheric general circulation (GCM) model developed at the Institute of Numerical Mathematics, Russian Academy of Sciences (INM RAS). The problem of synchronizing QBO and semiannual oscillations (SAO) of the zonal velocity in the mesosphere is considered. It is shown that the process of synchronization to multiples of SAO periods is identifiable in the transition region between QBO and SAO. For all heights where QBO exist, their synchronization with SAO is expressed in the calculation of the period in terms of differences between the westerly maxima. The INM RAS GCM model is shown to satisfactorily reproduce the main spectral characteristics of QBO and SAO, as well as specific features of the variability of the QBO period obtained from reanalysis data. The possibility of synchronization with SAO or the annual cycle in the upper layers is shown on the basis of an investigation of QBO models with a small number of parameters, both for the absorption mechanism of planetary waves by the mean flow and for the breaking of short gravity waves. The QBO formation from different wave types, together with SAO and the annual cycle, can be considered a unified system of oscillations in the circulation of the equatorial upper atmosphere. Pleiades Publishing, Ltd., 2010 quasi-biennial oscillations nationallicence semiannual oscillations nationallicence synchronization nationallicence spectral analysis nationallicence atmospheric general circulation models nationallicence stratosphere and mesosphere dynamics nationallicence interaction of waves with mean flow nationallicence Kulyamin D. Institute of Numerical Mathematics, Russian Academy of Sciences, ul. Gubkina 8, 119991, Moscow, Russia aut Dymnikov V. Institute of Numerical Mathematics, Russian Academy of Sciences, ul. Gubkina 8, 119991, Moscow, Russia aut Izvestiya, Atmospheric and Oceanic Physics SP MAIK Nauka/Interperiodica 46/4(2010-08-01), 432-450 0001-4338 46:4<432 2010 46 11485 https://doi.org/10.1134/S0001433810040031 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0001433810040031 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kulyamin D. Institute of Numerical Mathematics, Russian Academy of Sciences, ul. Gubkina 8, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Dymnikov V. Institute of Numerical Mathematics, Russian Academy of Sciences, ul. Gubkina 8, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Izvestiya, Atmospheric and Oceanic Physics SP MAIK Nauka/Interperiodica 46/4(2010-08-01), 432-450 0001-4338 46:4<432 2010 46 11485 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer