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Free keywords:
Effective Angular Momentum; ESMGFZ; Earth Rotation Prediction; Polar Motion; Length-of-Day
Abstract:
The Earth System Modelling Group of GeoForschungsZentrum Potsdam
(ESMGFZ) provides geodetic products for gravity variations, Earth rotation excitations, and Earth
surface deformations related to mass redistributions and mass loads in the atmosphere, ocean,
and terrestrial water storage. Earth rotation excitation compiled as effective angular momentum
(EAM) functions for each Earth subsystem (atmosphere, ocean, continental hydrology) are
important for Earth rotation prediction. Especially the 6-day forecasts extending the model
analysis runs offer essential information for the improvement of ultra-short-term Earth rotation
predictions. In addition to the individual effective angular momentum function of each subsystem,
ESMGFZ calculates a combined EAM prediction product. Adjusted to the official Earth
orientation parameter (EOP) products IERS 14C04 and Bulletin A, this EAM prediction product
allows to extrapolate the polar motion and Length-of-Day parameter time series for 90 days
into the future via the Liouville equation. ESMGFZ submits such an EOP prediction to the 2nd
EOPPCC campaign.
