El Niño impact on atmospheric polar motion excitation

Details El Niño impact on atmospheric polar motion excitation El Niño impact on atmospheric polar motion excitation

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.3081k&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue B2, p. 3081-3088

Physics

3

Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Oceanography: Physical: El Nino, Planetology: Solid Surface Planets: Polar Regions

Scientific paper

We study the influences of El Niño phenomena on correlations between short-period variations of atmospheric and geodetic excitation functions of polar motion during 1980-1998. The correlation between these two excitation functions varies with time, with correlation coefficients computed for 1 year spans reaching maxima of 0.7-0.8. Series of these correlation coefficients themselves correlate with El Niño and Southern Oscillation Index (SOI) data, indicating the influence of El Niño and SOI on atmospheric and geodetic excitation functions of polar motion and on polar motion itself. The maximum correlation coefficients for Niño 4 sea surface temperature data is equal to 0.8 in the case of El Niño events in 1983 and 1987. Impacts of El Niño on polar motion have an impulsive character causing irregular variations of polar motion during the El Niño epochs.

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