Relationship between the astrometric z-term, the Earth rotation and the southern oscillation index.

Details Relationship between the astrometric z-term, the Earth rotation and the southern oscillation index. Relationship between the astrometric z-term, the Earth rotation and the southern oscillation index.

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290.1001l&link_type=abstract

Astronomy and Astrophysics 290, 1001-1008 (1994)

Astronomy and Astrophysics

Astrophysics

2

Astrometry, Earth, Data Analysis

Scientific paper

The z-term series derived from astronomical observations is related to plumb-line deflection. Its analysis over the interval 1962-1982 reveals interannual variations with amplitudes of about 0.01". These variations appear to be significantly correlated with both the length-of-day variations and the Southern Oscillation Index characterizing El Nino events, and this with a time lag of about 12 months. This z-term series appears to be of great interest in the study of relationships between Earth rotation and geophysical process like in particular oceano-atmospheric phenomena.

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