[IGSMAIL-5287]: Announcement of Session G4 of EGU Meeting

[Markus Rothacher]

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IGS Electronic Mail      10 Jan 16:48:17 PST 2006      Message Number 5287
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Author: Markus Rothacher

Dear Colleagues,

we would like to draw your attention to session G4

"Interactions between the three pillars of space geodesy: surface
geometry, Earth rotation and gravity field"

at the EGU General Assembly to be held in Vienna, Austria,
April 2-7, 2006.

The topic of session G4 has to be seen in the context of the
Global Geodetic Observing System (GGOS) project of the IAG. It tries to
cover the scientific issues concerning the integration of the space geodetic
techniques.

The deadline for the submission of abstracts is January 13, 2006, for
online submission (January 9, 2006, else).
Further information is available at the web site of the conference:

http://meetings.copernicus.org/egu2006/

We are looking forward to your contribution to this challenging
and interesting topic.

With best regards,

Markus Rothacher, Hermann Drewes
Conveners Session G4

Description of Session G4:

Interactions between the three pillars of space geodesy: surface
geometry, Earth rotation and gravity field
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At the IAG Scientific Assembly in Cairns in Summer 2005 the Global 
Geodetic Observing
System (GGOS), a project of the IAG entered its operational phase.
One of the goals of GGOS is the integration of the three pillars of geodesy,
namely the Earth's shape (including the oceans), Earth rotation and
the Earth's gravity field, as well as their temporal variations. The 
topic of this
session are all the relationships and interactions between these three 
pillars.
Contributions are welcome from purely theoretical and/or modelling 
considerations to
observational evidence of the relationships derived from the space geodetic
techniques including VLBI, SLR, DORIS, GNSS, the altimetry and gravity 
missions, and
data on the global geophysical fluids. We also encourage contributions 
showing results
based on a combined and consistent estimation of parameters from all 
three pillars.
The consistent modelling of all three (or at least two of the three) 
pillars in a physical
sense and the setup of common standards for the geometrical as well as 
the gravimetrical
component, should also be considered in such an integration process and 
belong to
the scope of this session.
Examples of interesting relationships are, e.g., reference frame origin 
and orientation,
the low-degree gravity field coefficients (C01, S11, C11, S21, C21, and 
S22), and the
position and orientation of the Earth's figure and rotation axes; 
loading effects seen as
surface deformation, gravity field changes and Earth rotation 
variations; global mass transport,
conservation of mass and angular momentum; connections between "wind" 
and "matter" terms derived
from Earth rotation, gravity field variations and surface deformation; 
variations in polar
motion and length of day related to changes of the changes of the 
Earth's inertia
tensor and J2 (e.g., from SLR or CHAMP/GRACE); etc.


-- 
Prof. Dr. phil. nat. Markus Rothacher
GeoForschungsZentrum Potsdam (GFZ)
Department 1: Geodesy & Remote Sensing
Telegrafenberg A 17, D-14473 Potsdam, Germany

phone:  +49 (0)331 288-1100
fax:    +49 (0)331 288-1111
e-mail: rothacher at gfz-potsdam.de         
www:    http://www.gfz-potsdam.de