Mathematics – Logic
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1843n&link_type=abstract
Geophysical Research Letters, Volume 19, Issue 18, p. 1843-1846
Mathematics
Logic
1
Geodesy And Gravity: Reference Systems, Oceanography: Physical: Air/Sea Interactions
Scientific paper
Atmospheric wind and pressure contributions to non-seasonal variations in the length of day (LOD) determined by the International Radio Interferometry Surveying are evaluated during the years of 1984-1991 using Japan Meteorological Agency data that include winds up to 10 mb. We confirm that intra-annual LOD variations are the result of tropospheric zonal wind changes, which include a pronounced quasi-seven month oscillation in addition to the well-known intra-seasonal oscillation. It is also shown that inter-annual LOD variations on time scales of two to five years are the superposed contributions from both a stratospheric quasi-biennial oscillation and tropospheric low frequency variations of two-to-five year time scales in zonal wind. The residual LOD after removing these atmospheric contributions shows a decadal-like variation, which may be caused by a core-mantle coupling torque.
Kikuchi Naokichi
Naito Isao
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