Physics – Geophysics
Scientific paper
Dec 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973papge.102..193h&link_type=abstract
Pure and Applied Geophysics PAGEOPH, Volume 102, Issue 1, pp.193-222
Physics
Geophysics
32
Scientific paper
The global distributions of the annual and seasonal means of the diurnal ( S 1) and semidiurnal ( S 2) surface pressure oscillations are investigated by spherical harmonic analysis. The main waves are, S 1 1 (with wave number 1) for S 1 and S 2 2 for S 2. S 1 1 is much less predominant among the waves of S 1 than S 2 2 among those of S 2. As in the case of the lunar semidiurnal barometric tide L 2 the pressure maxima occur earlier in the Southern than in the Northern Hemisphere. In the case of S 2 the standing wave S 2 0 and the wave S 2 3 are also of interest besides S 2 2. Although the present analysis extends only from 60°N to 60°S, while S 2 0 is largest at polar latitudes, its results show that S 2 0 should be smaller at high southerly than at high northerly latitudes, as has been observed. Thus this observed asymmetrical distribution of S 2 0 may be due to causes outside the polar regions rather than to their geographical differences. The best approximation to the observed distribution of S 2 0 is obtained by including a mode representing an oscillation independent of longitude and latitude indicating a small semidiurnal variation of the mean global surface presure, which is an unlikely result on physical grounds. The seasonal variation of S 1 1 expressed in percent of the annual mean is smaller than that of S 2 2, and both are less than the unexplained seasonal variation of L 2 2. The main waves S 1 1 and S 2 2 are expressed not only by associated Legendre functions, but also by Hough functions.
Cowley Ann D.
Haurwitz Bernhard
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