The authors express their thanks to Michael Schindelegger (TU Vienna), who kindly provided the atmospheric angular momentum functions based on MERRA data.
2011, High-resolution atmospheric angular momentum functions related to Earth rotation parameters during CONT08.
The effects of geophysical excitations in nutation are caused by quasi-diurnal changes of angular momentum functions of the atmosphere and oceans, expressed in terrestrial frame.
However, this effect was found to be different for different sources of atmospheric/oceanic angular momentum functions (Ron et al.
Pressure (matter) and wind (motion) terms of atmospheric angular momentum functions (AAMF) from NCEP/NCAR re-analysis (Salstein, 2005).
Pressure and wind terms of AAMF plus matter and motion terms of oceanic angular momentum functions (OAMF) from the European Centre for Medium Weather Forecast (eCmWF) ERAinterim analysis model for the atmosphere and oceanic model OMCT driven by the same atmospheric model, prepared at IERS/GFZ center (Thomas et al.
The series of effective angular momentum functions
[chi] in terrestrial frame (in complex form) were subject to the complex demodulation (Brzezinski et al.
To this end, we use the atmospheric and oceanic angular momentum functions
that are now available from different agencies.
There are atmospheric angular momentum functions
(AAM) available from the IERS Special Bureau for the Atmosphere with sub-diurnal resolution (in 6-hour intervals) from the NCEP/NCAR re-analysis of atmospheric data (Salstein, 2005); oceanic data are publicly available only in daily intervals.