Atmospheric angular momentum time series: characterization of their internal noise and creation of a combined series

Details Atmospheric angular momentum time series: characterization of their internal noise and creation of a combined series Atmospheric angular momentum time series: characterization of their internal noise and creation of a combined series

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..138k&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

Earth Rotation, Earth Atmosphere

Scientific paper

The effects of the atmosphere on the Earth rotation are classically computed using the angular momentum approach. In this method, the variations in the rotation of the Earth are estimated from the variations in the atmospheric angular momentum (AAM). Several AAM time series are available, from different meteorological centers. However, the estimation of atmospheric effects on Earth rotation differs when using one atmospheric model or the other. The purpose of our work is to build an objective criterion which justifies the use of one series in particular. We determine the quality of each series by making an estimation of their noise level, using a generalized formulation of the "three-cornered hat method". As the quality of the series varies in time, we construct a combined AAM series, using time dependent weights chosen so that the noise level of the combined series, estimated using the three-cornered hat method, is minimal.

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