Abstract
The relations between the changes of the length of day (LOD) and variations of the atmospheric angular momentum (AAM) are studied. The results of the AAM calculations based on the U. S. NMC data from 1000hPa to 0.4hPa and the comparison with the LOD data for 1979-1992 are presented. It is shown that the changes of the LOD are in good agreement with the variations of the relative atmospheric angular momentum (AAM) on intra-annual time scale (in time scales less than one year) during 1979-1992. On decadal time scales, the LOD shows a large variation, while the AAM does not show a significant variation. This large discrepancy is considered to have a non-atmospheric origin.
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