Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1299m&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 12, p. 1299-1308.
Physics
2
Intra-Seasonal Oscillations (Iso), Sudden Stratospheric Warmings (Ssw), Ncep Data Analysis, Stratosphere Dynamics, Theoretical Modeling
Scientific paper
Intra-seasonal oscillations (ISO) are observed in the zonal-mean of mesospheric wind and temperature measurements--and the numerical spectral model (NSM) generates such oscillations. Relatively large temperature ISO are evident also in stratospheric CPC (NCEP) data at high latitudes, where the NSM produces amplitudes around 3 K at 30 km. Analyzing the NCEP data for the years 1996-2006, we find in Fourier spectra signatures of oscillations with periods between 1.7 and 3 months. With statistical confidence levels exceeding 70%, the spectral features are induced by nonlinear interactions involving the annual and semi-annual variations. The synthesized data show for the 10-year average that the temperature ISO peak in winter, having amplitudes close to 4 K. The synthesized complete spectrum for periods around 2 months produces oscillations, varying from year to year, which can reach peak amplitudes of 15 and 5 K respectively at northern and southern polar latitudes.
Huang Frank T.
Mayr Hans G.
Mengel John G.
Nash Eric R.
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