Atmospheric and Hydrospheric Earth Rotation Excitations

Matter and motion terms of effective angular momentum functions (EAM) due to mass transport processes in atmosphere, oceans, and the continental hydrosphere are provided with a temporal resolution of down to 3 hours as GFZ's contribution to the Global Geophysical Fluid Center (GGFC) of the International Earth Rotation and Reference Systems Service (IERS). The time-series start in January 1976 and are routinely updated every day at ~10:00 UTC with all 8 time-steps of the previous day. In addition, 3-hourly forecasts for up to 6 days into the future are also provided. 

CHI 1 - AAM
CHI 1 - HAM
CHI 1 - OAM
CHI 2 - AAM
CHI 2 - HAM
CHI 2 - OAM
CHI 3 - AAM
CHI 3 - HAM
CHI 3 - OAM

Figures: Latest Earth rotation effective angular momentum (EAM) functions for the atmosphere (AAM), continental hydrology (HAM) and ocean (OAM) separated into the tree components chi1, chi2 and chi3. The figures show the mass/pressure term (blue) end the motion term (green). Latest 6-day forecast are given purple and yellow. 

Reference Paper:

  • Dobslaw, H., Dill, R., Gr√∂tzsch, A., Brzezinski, A., Thomas, M. (2010): Seasonal polar motion excitation from numerical models of atmosphere, ocean, and continental hydrosphere. Journal of Geophysical Research, 115, B10406,
    doi:10.1029/2009JB007127

Contact

Profile photo of  Dr. Robert Dill

Dr. Robert Dill
Earth System Modelling

Telegrafenberg
Building A 20, room 326
14473 Potsdam
tel. +49 331 288-1750

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