Prediction of the Effective Angular Momentums (EAM)

Effective Angular Momentum (EAM) functions of the earth are important quantities that relate the mass exchange in different earth environments (atmosphere, ocean, land, and sea level) to the physical properties of the earth, including earth orientation parameters. Forecasts of EAM functions are therefore important, for they fundamentally help in the prediction of time-dependent physical properties of the earth, like those related to its orientation.

The Space Geodesy group at ETH Zurich aims to provide reliable, real time, and accurate prediction of geodetic parameters via its Geodetic Prediction Center (GPC). Now, forecasts of EAM functions of all four types (atmospheric AAM, oceanic OAM, hydrological HAM, and sea-level SLAM) up to 14 days to the future are provided on a daily basis. Our EAM predictions are based the application of machine learning on data from GFZ Potsdam. These forecasts can be used, for instance, to compute more accurate predictions of earth orientation parameters. Potential applications also include to the study of climate and oceans, benefitting the earth science community.

Reference

Publications

[1] Kiani Shahvandi, M., Schartner, M., Gou, J. & Soja, B. (2023, July). Operational 14-day-ahead prediction of Earth's effective angular momentum functions with machine learning, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023). https://doi.org/10.57757/IUGG23-0346

[2] Kiani Shahvandi, M., Gou, J., Schartner, M., & Soja, B. (2022, July). Data Driven Approaches for the Prediction of Earth's Effective Angular Momentum Functions. In IGARSS 2022-2022 IEEE International Geoscience and Remote Sensing Symposium (pp. 6550-6553). IEEE. https://doi.org/10.1109/IGARSS46834.2022.9883545