Physics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8391m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 20, 1987, p. 8391-8399.
Physics
38
Angular Momentum, Atmospheric Tides, Daytime, Pressure Oscillations, Spectrum Analysis, Tropical Meteorology, Earth Rotation, Fourier Analysis, Length, Wind Effects
Scientific paper
Attempts are made to link observed variations of the length-of-day with a period near 50 days to the atmospheric 40- to 50-day oscillation in the tropics. Because the earth-atmosphere system maintains constant angular momentum a longer length of day (slower rotation rate of the earth) goes with higher momentum of the atmosphere. It is shown that the longest length of day and greatest atmospheric momentum occurs when tropical convection associated with the 40- to 50-day oscillation is beginning to weaken near or east of the date line. Some evidence is presented suggesting that, over a broad period range bridging 40-50 days, a strengthening of the easterlies east of the convection increases wind stress and frictional torques, and serves as an important mechanism for exchange of momentum from earth to atmosphere.
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