Consistent set of atmospheric and oceanic angular momentum, 1994 - 2022

Data supplement for manuscript Kiani Shahvandi, M., Schindelegger, M., Börger, L., Mishra, S., & Soja, B. (2024). Revisiting the excitation of free core nutation. Journal of Geophysical Research: Solid Earth, 129, e2024JB029583. https://doi.org/10.1029/2024JB029583

Specifications for AAM:

• Data source: Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2)
• Temporal resolution & coverage: 3 hourly, 1994--2022
• Units for mass and motion terms: kg*m^2*s^(-1)
• Processing: Stationary signals due to atmospheric tides have been removed
• Other processing steps: Mass terms include angular momentum changes associated with the ocean's inverted barometer (IB) response

Specifications for OAM:

• Derived from a barotropic ocean model simulation (the DEBOT model w/o data assimilation) using MERRA-2 atmospheric forcing
• Temporal resolution & coverage: 3 hourly, 1994--2022
• Units for mass and motion terms: kg*m^2*s^(-1)
• Processing: Stationary signals due to atmospheric tides have been removed
• Other processing steps: Angular momentum changes associated with the ocean's IB response are not part of OAM, but AAM (see above)

For further information see ReadMe.txt.

Terms of usage:

If you use the AAM time series, please cite: 

Kiani Shahvandi, M., Schindelegger, M., Börger, L., Mishra, S., & Soja, B. (2024). Revisiting the excitation of free core nutation. Journal of Geophysical Research: Solid Earth, 129, e2024JB029583. https://doi.org/10.1029/2024JB029583

If you use the OAM time series, please cite: 

Harker, A.A., Schindelegger, M., Ponte, R.M., Salstein, D.A., 2021. Modeling ocean-induced rapid Earth rotation variations: an update. J Geod 95, 110. https://doi.org/10.1007/s00190-021-01555-z

Please cite both papers if you use the AAM and OAM time series.

Contact: L. Börger (lboerger@igg.uni-bonn.de)