Short periodic variations of polar motion and hemispheric atmospheric angular momentum excitation functions in the period 1984-1992

Details Short periodic variations of polar motion and hemispheric atmospheric angular momentum excitation functions in the period 1984-1992 Short periodic variations of polar motion and hemispheric atmospheric angular momentum excitation functions in the period 1984-1992

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..217n&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 2, p. 217-225

Mathematics

Logic

10

Angular Momentum, Atmospheric Circulation, Earth Atmosphere, Earth Rotation, Periodic Variations, Atmospheric Pressure, Correlation Coefficients, El Nino, Excitation, Southern Oscillation, Very Long Base Interferometry

Scientific paper

Short periodic oscillations with the periods from 10 up to 110 days of the hemispheric components of effective atmospheric angular momentum (EAAM) excitation function and their correlation with polar motion excitation function have been analyzed. The EAAM data of the Japan Meteorological agency (JMA) computed for the two hemispheres and the very lond baseline interferometry (VLBI) polar motion NGS 92 R01 data (NGS 1992), determined by the National Geodetic survey were applied. The distinct oscillations with periods of about 28, 35-55 and 60-80 days were detected in the chi(sub y)-component of both polar motion excitation function and northern EAAM excitation functions containing wind and pressure, with and without inverted barometric correction terms. The Chi(sub y)-component of the polar motion excitation function is significantly correlated (correlation coefficient equal to (0.55-0.75) with the chi (sub y)-components of the northern EAAM excitation functions mentioned above, which are mostly induced by the atmospheric circulation over lands. No meaningful correlation between polar motion excitation functions was found. The chi(sub x)-components of the EAAM and polar motion excitation functions are not significanly correlated. The strong short periodic variation of the length of day (LOD) and chi(sub y) in the early 1988 seems to be caused by the above-mentioned 35-55 days oscillations of the northern hemisphere atmosphere. This variation can be related to the rapid passing from the El Nino to the La Nina phenomenon or from the minimum to the maximum in the Southern Oscillation Index in 1987-1989.

Affiliated with

Also associated with

No associations

Rating

Short periodic variations of polar motion and hemispheric atmospheric angular momentum excitation functions in the period 1984-1992 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Short periodic variations of polar motion and hemispheric atmospheric angular momentum excitation functions in the period 1984-1992, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Short periodic variations of polar motion and hemispheric atmospheric angular momentum excitation functions in the period 1984-1992 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1630002