Optimal Use of Atmospheric and Ocean Angular Momentum Data to Predict Earth Orientation
Abstract
The accuracy of the near real-time determination of Earth orientation parameters (EOP) and their short-term predictions can benefit from combining Atmospheric Angular Momentum (AAM) and Ocean Angular Momentum (OAM) analysis and forecast data sets with the astrogeodetic observations. Recent improvements in the US Navy's NAVGEM atmospheric series and the HYCOM ocean series provide the opportunity to re-examine the most effective combination of these data to estimate the level of possible improvement in predictions of Earth rotation and polar motion parameters. To investigate this prospect, comparisons with other contemporary similar sets of data are carried out, and the correlations of several angular momentum data sets with the EOP parameters are calculated and analyzed. The GeoForschungsZentrum (German Research Centre for Geosciences) provides forecasts of effective angular momentum (EAM) functions for up to 90 days in the future. These results combine OAM and AAM information with Hydrospheric Effective Angular Momentum functions (HAM) and Sea-Level Angular Momentum (SLAM) and can contribute to the improvement of EOP predictions. We estimate the changes at different forecast lead times by calculating the tendencies in the EOPs making use of angular momentum data and comparing results.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMG008.0006S
- Keywords:
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- 1229 Reference systems;
- GEODESY AND GRAVITY;
- 1243 Space geodetic surveys;
- GEODESY AND GRAVITY;
- 1294 Instruments and techniques;
- GEODESY AND GRAVITY;
- 1295 Integrations of techniques;
- GEODESY AND GRAVITY