Excitation of Non-Atmospheric Polar Motion by the Migration of the Pacific Warm Pool

Details Excitation of Non-Atmospheric Polar Motion by the Migration of the Pacific Warm Pool Excitation of Non-Atmospheric Polar Motion by the Migration of the Pacific Warm Pool

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.g22c0317y&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #G22C-0317

Other

1223 Ocean/Earth/Atmosphere Interactions (3339), 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1239 Rotational Variations, 4215 Climate And Interannual Variability (3309), 4227 Diurnal, Seasonal, And Annual Cycles

Scientific paper

Changes in the annual variation of the Earth's polar motion are found to be largely caused by the variation of the atmospheric angular momentum (AAM). Recent simulation results of oceanic general circulation models further suggested global oceanic effects on the annual polar motion other than the atmosphere. In parallel to previous model studies of global oceanic effect, this research particularly singles out an active large-scale ocean anomaly and investigates its effect on the annual polar motion, determined from satellite observations of the movement of the Western Pacific Warm Pool (WPWP). Although the scale of the warm pool is much smaller than that of the solid Earth, analysis of the non-atmospheric polar motion excitation has shown that the WPWP does contribute non-negligible effects to the annual polar motion. The analysis consisted of over thirty years of the WPWP data (1970-2000) and shows the polar motion excitation is (2.5mas, -78o) for the x-component and (0.1mas, -14o) for the y-component. Comparing this result with the total geodetic non-atmospheric polar motion excitation of (10.3mas, 59o) for the x-component and (10.6mas, 62o) for the y-component, shows the significance of the WPWP. The difference between the WPWP's excitation on (x, y) components of the polar motion may originate from the WPWP's location and general pattern. Changes in the Earth's polar motion has attracted significant attention, not only because it is an important geodetic issue, but also because it has significant value as a global measure of variations within the hydrosphere, atmosphere, cryosphere, and solid Earth; hence global changes. Key Words. Polar motion - Western Pacific Warm Pool

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