Annual and semiannual cycles based on the middle atmosphere reference model

Details Annual and semiannual cycles based on the middle atmosphere reference model Annual and semiannual cycles based on the middle atmosphere reference model

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985maph...16..175b&link_type=abstract

In International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 16 p 175-180 (SEE N86-12814 03

Computer Science

Annual Variations, Atmospheric Temperature, Fourier Analysis, Middle Atmosphere, Planetary Waves, Temperature Distribution, Amplitudes, Atmospheric Pressure, Latitude, Northern Hemisphere, Southern Hemisphere, Stratosphere

Scientific paper

The SCR/PMR monthly temperature mean values were Fourier analysed at each latitude and pressure level to obtain the annual mean and the amplitude and phase of the annual and semiannual cycles. The phase is the month of the maximum, such that 1 = January 1, 1.5 = January 16, 2 = February 1, etc. Some very marked hemispheric differences noted are: (1) at 80 N there is a maximum amplitude of the annual cycle of 26 K at 2.5 mb, the corresponding maximum at 80 S is much stronger (35 K) and at a lower altitude (11 mb); (2) the semiannual amplitudes show the well known maximum over the tropics in the upper stratosphere, but also maxima at high latitudes; and (3) the annual mean shows a minimum at 50 S, 1 mb, and a corresponding weaker minimum at 60 N. In general, the hemispheres are remarkably similar and six months out of phase above about 0.3 mb (56 km). The two hemispheres are significantly different especially in winter after allowing for a six month shift. Changes rom summer to winter are so large by comparison that the annual cycles appear to be very similar.

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