Hydrological effects on polar motion compared to GRACE observations.

Details Hydrological effects on polar motion compared to GRACE observations. Hydrological effects on polar motion compared to GRACE observations.

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..145s&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

The influence of the continental hydrologic signals on the polar motion is not well known. Different models have been developed to evaluate and compare these effects to geodetic observations. Previous studies have shown large disagreements mainly due to the lack of global measurements of related hydrological parameters. The recent Gravity Recovery and Climatic Experiment (GRACE) mission allows us to compute excitation functions (χ_1+iχ_2) of polar motion due to unmodelled variations like hydrological processes. We have compared this gravimetric-based excitation to the excitation estimated from a hydrological model and from geodetic observations for the period February 2003 to December 2006. The residuals of the geodetic excitation are not fully explained, neither by the hydrological model nor by the gravimetric data. However, considering annual variations, there is a good agreement between geodetic and gravimetric excitations especially in amplitude. The hydrological model-based excitation has significant discrepancies for the real component of the excitation χ_1. We found that all series show common interannual oscillations of nearly 1.3 year period coinciding with Amazon's water storage variations (Schmidt et al. 2007).

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