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Intra-Seasonal Monthly Oscillations in Stratospheric NCEP Data and Model ResultsIntra-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.
Document ID
20100034949
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Mayr, H. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mengel, J. G.
(Science Systems and Applications, Inc. Lanham, MD, United States)
Huang, F. T.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Nash, E. R.
(Science Systems and Applications, Inc. Lanham, MD, United States)
Date Acquired
August 25, 2013
Publication Date
May 10, 2009
Publication Information
Publication: Journal of Atmospheric and Solar-Terrestrial Physics
Volume: 71
Issue: 12
Subject Category
Meteorology And Climatology
Distribution Limits
Public
Copyright
Other

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