Earth Rotation and Global Dynamic Processes Joint Research Activities in Germany Jürgen Müller, Institut für Erdmessung, University of Hannover Coordination with H. Kutterer, M. Soffel, (H. Schuh) DGK Jahressitzung, BADW München, November 2004

Time Scales in Earth Rotation Chao, EOS Long-term Medium-term Short-term

Effects in the Earth System wrt. Earth Rotation Orientation of the Earth Precession,Nutation Polar motion Length of day Deformation of the Earth Tides of the solid Earth Lunisolar Gravitational acceleration Atmospheric tides Atmospheric loading Density variations in the atmosphere Global vegetation Global ground water Oceanic tides Ocean currents Angular momentum variation of the atmosphere Angular momentum variation of the oceans Ocean loading Effects from Earth interior … Snow Postglacial land uplift … Tectonic Plate motion Vulcanism Earthquakes Pole tides Angular torques

Interaction: Techniques, Parameters, Processes From Rothacher

Objectives The main objective is the comprehensive and consistent modelling of Earth rotation i.e. integral modelling of all relevant sub-systems of the Earth system a) High-frequency and episodic processes of Earth rotation b) Decadic and secular variations of Earth rotation c) Earth rotation as indicator for climatic variations d) Contribution to an integrated global geodetic observation system (GGOS)

Research Group Geodesy Bundesamt für Kartographie und Geodäsie BKG, Frankfurt (Richter, Klügel) Deutsches Geodätisches Forschungsinstitut DGFI, München (Drewes) Forschungseinrichtung Satellitengeodäsie FESG, TU München (Rothacher, Schreiber) Geodätisches Institut GIUB, Universität Bonn (Nothnagel) Geodätisches Institut GIH, Universität Hannover (Kutterer) Institut für Erdmessung IfE, Universität Hannover (Müller) Institut für Geodäsie und Geophysik IGG, TU Wien (Schuh, Weber)[1][1] Institut für Planetare Geodäsie IPG, TU Dresden (Soffel, Klioner) Meteorology Institut für Meteorologie IMB, Freie Universität Berlin (Ulbrich) Oceanography Alfred-Wegener-Institut für Polar- und Meeresforschung AWI, Bremerhaven (Schröter) Institut für Planetare Geodäsie IPG, TU Dresden (Thomas) Geophysics GeoForschungsZentrum GFZ, Potsdam (Greiner-Mai) [1][1] The Institut für Geodäsie und Geophysik (IGG), TU Vienna is involved in this research group within the D-A-CH framework of German speaking scientific organisations.

Projects Modelling Analysis/processing 3. Nutation, relativity IPG 5. LLR IfE, FESG 6. Combination of space geodetic techniques DGFI, FESG 7. Ringlaser gyros FESG, BKG 8. High resolution EOP IGG, FESG, GIUB 9. EOP and gravity field validation IfE, GIH 2. Oceanic circulation AWI, IPG 1. ERIS BKG, IPG 10. EOP as climatic indicator IMB, IPG 4. Core / Mantle GFZ

Cooperations P1P2P3P4P5P6P7P8P9P10 BKG1 oo DGFIoo oo1 ooo FESGo 1/21 o GIUBo o 1/2 IfEo o 1o 1/2 GIHo o 1/2 IGGo oo(1) IPGo 1 o 1/2 IMBo ooo1 AWIo1 o GFZo 1 o Externaloooooooooo

Status DFG Deutsche Forschungsgemeinschaft Proposal to the German Research Foundation (DFG) Positive evaluation of pre-proposal (early 2004) Full proposal until end 2004 Funding from mid 2005 (if successful)

Conclusions Joint research activity in Germany: Investigation of Earth rotation and global dynamic processes The overall goal of this research project is the integral and inter-disciplinary treatment of Earth rotation, where the interaction of modelling and data processing, based on existing or new observation data, plays an important role. Time scales of some hours up to decades and longer will be covered. Start: 2005

Example P8: Sub-daily and Episodic EOP Variations 1.Determine high-quality GPS and VLBI observations 2.Modeling of single effects (atmosphere, ocean) 3.Comparison and analysis of differences

Example P5: Lunar Laser Ranging Luna years of measurements - modelling at mm-level - long-term stability (orbit, reference frame, nutation) - Earth-Moon dynamics - relativity parameters