Commission 3 Earth rotation and Geodynamics

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Commission 3Earth rotation and Geodynamics

• Véronique Dehant

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Sub-commissions

1. Earth Tides Chair Gerhard Jentzsch
2. Crustal Deformation Chair Markku Poutanen
3. Geophysical Fluids Chair Richard Gross

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Subcommission 3.1. Earth Tides

• Website exist and has been transferred from Japan
  to Jena and updated still checking national
  representative and affiliations.
• Most important activity preparation of the Earth
  tide meeting in Ottawa in August 1-6 2004 the
  new ET sub-commission Vice president, S.
  Patiatakis, is LOC chair.
• Names of sessions
• Names of conveners
• Proceeding publication
• Hsu Houtses 70th anniversary in Wuhan, opened
  China, especially toward Europe. Talk given by
  President of ET SC.

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Subcommission 3.2. Crustal Deformation

• Markku Poutanen gave me an update of their
  objectives (particular objectives in the frame of
  the general objectives presented in the Travaux
  and in the website). He noted in his report that
  these objectives are very close to those of
  IGGOS.
• They dont have a website. Markku Poutanen will
  send me some additional information to put on the
  web soon.

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Subcommission 3.2. Crustal Deformation

• SC 3.2. comprises sub-entities corresponding
  either to different regions or different
  important topics involved in the field. These
  sub-entities are dealing with main scientific
  objectives and in parallel follow the new
  developments in technology and instruments. It
  is planed to establish new WGs according to the
  needs.
• Close contacts between Wegener (L. Bastos) and SC
  3.2. the Directing Board members are involved in
  the Scientific program Committee of the 12th GA
  of Wegener project (Tangier, Marocco, September
  21-23, 2004).
• President of SC 3.2. is chairman of the NGOS
  (Nordic Geodetic Observing System) that will
  follow guidelines and principles of IGGOS.

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Subcommission 3.3. Geophysical Fluids

• Workshops
• Chandler Wobble Workshop
• Forcing of Polar Motion in the Chandler
  Frequency Band A Contribution to Understanding
  Interannual Climate Variations
• April 2123, 2004 , Hotel Parc Belle-Vue,
  Luxembourg
• Approximately 40 people participated

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Subcommission 3.3. Geophysical Fluids

• Conference sessions (1)
• 2003 Fall Meeting of the American Geophysical
  Union (December 710, 2003, San Francisco, CA)
• Session G02 Satellite Measurements of Temporal
  Gravity Variations
• Session G07 Reference Frame Definition and
  Modeling and Influence of Geophysical Fluids
• Session G08 Effect of Atmosphere and Ocean on
  Geodesy and Geodynamics Observation and Modeling
  
• Session G13 Seasonal Signals in Space Geodetic
  Solutions
• 1st General Assembly of the European Geosciences
  Union (April 2430, 2004, Nice, France)
• Session G1 Global Water Cycle from Geodesy
• Session G2 Time Varying Gravity Observations
  and Interpretation
• Session G5 Earth Rotation and Polar Motion
• Session G7 Reference Frame Definition, Influence
  of Geophysical Fluids, and Combination of Space
  Geodesy Techniques
• Session G9 Results of Recently Launched
  Missions CHAMP, ENVISAT, ICESAT, JASON-1, and
  GRACE
• Session G10 Seasonal signals in Space Geodetic
  Solutions

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Subcommission 3.3. Geophysical Fluids

• Conference sessions (2)
• 2004 Spring Meeting of the American Geophysical
  Union (May 1721, 2004, Montreal, Canada)
• Session U08 Time-Variable Gravity Observation,
  Modeling, and Interpretation
• Session G03 Observations of Glacial Isostatic
  Adjustment and Contemporary Ice-Ocean-Mantle Mass
  Redistribution
• Session G05 Causes and Consequences of
  Variations in Earth Rotation on Seismic to
  Millennial Time Scales

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Subcommission 3.3. Geophysical Fluids

• Future activities
• Continue to convene sessions at future
  conferences (AGU, EGU)
• Propose joint session with IAPSO for the 2005
  General Assembly of the IAG
• Are thinking to create a WG for examining all the
  questions related to the excitation of CW.
• No website but I will put the information given
  by R. Gross on our website

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Commission Project GGP

• Present activities
• Continue to monitoring of gravity
• Some stations have experienced some failure but
  currently in good shape or in transition phase
• New stations
• Inclusion of earthquake data from SC gravimeter
  in database.

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Program activities

• Participation in particular meetings related to
  geodynamics and Earth rotation. See SC
  activities.
• Participation in the IAG Project Integrated
  Global Geodetic Observing System (IGGOS).
  Descartes Prize money dedicated to a project
  related to IGGOS.
• Linking Commission 3 with its sister commission
  of the IAU. Preparation of NRO movies
• Outside of the proposed activities
• A lot of press interviews related to Descartes
  Prize and publicity for IAG
• 300 000 on ROB account Call for Proposals
  Advisory Board has selected the projects for the
  next decimal of nutation, for the geophysical
  fluids (IERS), for IGGOS.