Remaining error sources in the nutation at the submilliarc second level

Details Remaining error sources in the nutation at the submilliarc second level Remaining error sources in the nutation at the submilliarc second level

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgrb..108.2275d&link_type=abstract

Journal of Geophysical Research (Solid Earth), Volume 108, Issue B5, pp. ETG 13-1, CiteID 2275, DOI 10.1029/2002JB001763

Astronomy and Astrophysics

Astronomy

7

Geodesy And Gravity: Diurnal And Subdiurnal Rotational Variations, Geodesy And Gravity: Earth'S Interior-Dynamics (8115, 8120), Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions (3339), Geodesy And Gravity: Reference Systems

Scientific paper

Earth's precession and nutations are mainly generated by the luni-solar tidal torque. Diurnal retrograde variations in the atmospheric and oceanic angular momenta in an Earth-fixed reference system induce some additional nutation motions. Observed precession and nutations are derived from very long baseline interferometry (VLBI) data, assuming that the direction of the observed quasars are fixed in space. In this study, we consider the effects of two possible causes for explaining discrepancies between the observed nutations and those modeled in MHB2000 (model adopted by the International Astronomical Union): (1) the time variations in the atmospheric (and potentially oceanic) forcing of the nutations, of the free core nutation (FCN), and of the free inner core nutation (FICN), and (2) the possible contamination of VLBI-derived nutation amplitudes by apparent changes in the directions of the extragalactic radio sources. The robustness of MHB2000 is tested by perturbing some of the parameters and assessing the validity of the resulting nutation amplitudes against realistic estimations. We show that even allowing for large discrepancies related to atmospheric forcing, the ranges of the possible changes in the FCN and FICN periods and damping factors are small.

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