Variations of zonal anomalies of atmospheric excitation functions for polar motion during 1983-1999

Type: Journal Article

Venue: Proceedings, Journees de geophysique

Citation:

Nastula, J., B. Kolaczek, and D. Salstein, 2002: Variations of zonal anomalies of atmospheric excitation functions for polar motion during 1983-1999, Proceedings, Journees de geophysique, Royal Observatory of Belgium, Brussels, Belgium.

Resource Link: http://adsabs.harvard.edu/abs/2003jsrs...13...81N

The pressure term of atmospheric excitation function for polar motion and monthly anomalies of its equatorial components χ₁ and χ₂ are computed in equal area belts for the 17 years from 1983 to 1999. The variance of the excitation maximizes in the middle to higher latitude belts of both hemispheres. In the case of equatorial component χ₁ of this excitation function there are distinct annual oscillations in the north. In the χ₂ component there are distinct disturbances in the south coinciding with La Nina phenomena in 1988, 1992, 1998. The variation in the overall amplitude of the excitation, from a combination of the χ₁ and χ₂ terms, maintains a distinctly annual oscillation in the north and La Nina disturbances in the south in its signature.