Earth Rotation and Global Dynamic Processes

Joint Research Activities in Germany

Earth Rotation and Global Dynamic Processes

Joint Research Activities in Germany

Jürgen Müller, Institut für Erdmessung, University of Hannover

(mueller@ife.uni-hannover.de)

Coordination with H. Kutterer, M. Soffel, (H. Schuh)

DGK Jahressitzung, BADW München, 217.-19. November 2004

Time Scales in Earth RotationTime Scales in Earth Rotation

Chao, EOS

Long-term

Medium-term

Short-term

Effects in the Earth System wrt. Earth Rotation

Orientation of theEarth

Precession,NutationPolar motionLength of day

Deformation of theEarth

Tides of the

solid EarthLunisolarGravitational acceleration

Atmospheric tides

Atmospheric loading

Density variations in the atmosphere

Global vegetation

Global ground water

Oceanictides

Ocean currents

Angular momentum variation

of theatmosphere

Angular momentum variation

of theoceans

Ocean loading

Effects from

Earth interior

…

Snow

Postglacialland uplift

…

TectonicPlate 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

GeodesyBundesamt 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]Institut für Planetare Geodäsie IPG, TU Dresden (Soffel, Klioner)

MeteorologyInstitut für Meteorologie IMB, Freie Universität Berlin (Ulbrich)

OceanographyAlfred-Wegener-Institut für Polar- und Meeresforschung AWI, Bremerhaven (Schröter)Institut für Planetare Geodäsie IPG, TU Dresden (Thomas)

GeophysicsGeoForschungsZentrum GFZ, Potsdam (Greiner-Mai)

[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, relativityIPG

5. LLRIfE, FESG

6. Combination of space geodetic techniques

DGFI, FESG

7. Ringlaser gyrosFESG, BKG

8. High resolution EOPIGG, FESG, GIUB

9. EOP and gravity field validation

IfE, GIH

2. Oceanic circulationAWI, IPG

1. ERISBKG, IPG

10. EOP as climatic indicator

IMB, IPG

4. Core / MantleGFZ

CooperationsCooperations

  P1 P2 P3 P4 P5 P6 P7 P8 P9 P10

BKG 1         o o      

DGFI o o   o o 1   o o o

FESG o         1/2 1 1/2 o  

GIUB o         o   1/2    

IfE o   o   1 o     1/2  

GIH o     o         1/2  

IGG o         o o (1)    

IPG o   1   o         1/2

IMB o           o o o 1

AWI o 1             o  

GFZ o     1         o  

External o o o o o o o o o o

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 observations2. Modeling of single effects (atmosphere, ocean) 3. Comparison and analysis of differences

Example P5: Lunar Laser RangingExample P5: Lunar Laser Ranging

Luna 17

- 34 years of measurements

- modelling at mm-level

- long-term stability (orbit, reference frame, nutation)

- Earth-Moon dynamics

- relativity parameters