Future Satellite Gravimetry and Earth Dynamics

Currently, a first generation of dedicated satellite missions for the precise mapping of the Earth’s gravity field is in orbit (CHAMP, GRACE, and soon GOCE). The gravity data from these satellite missions provide us with very new information on the dynami

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FUTURE SATELLITE GRAVIMETRY AND EARTH DYNAMICS

Future Satellite Gravimetry and Earth Dynamics

Edited by JAKOB FLURY and REINER RUMMEL

Institute for Astronomical and Physical Geodesy, Muenchen, Germany

123

A C.I.P catalogue record for this book is available from the library of Congress

ISBN 0-387-29796-0 ISBN 978-0387-29796-5 Published by Springer, P.O. Box 17, 3300 AA, Dordrecht, The Netherlands www.springeronline.com

Printed on acid-free paper

All Rights Reserved  2005 Springer No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purhcaser of the work. Printed in the Netherlands

Table of Contents

Preface

1 / Geoid and Gravity in Earth Sciences – An Overview

3

J. FLURY and R. RUMMEL / Future Satellite Gravimetry for Geodesy

13

/ Challenges from Solid Earth Dynamics for Satellite Gravity Field Missions in the Post-GOCE Era

31

R. RUMMEL

B. L. A. VERMEERSEN

and Gravity

J. RIEGGER

A. GU¨NTNER

/ Time Variation in Hydrology and 41

/ Future Gravity Missions and Quasi-Steady Ocean Circulation

57

and P. LEGRAND / Future Benefits of Time-Varying Gravity Missions to Ocean Circulation Studies

73

/ Ice Mass Balance and Ice Dynamics from Satellite Gravity Missions

83

/ Benefits to Studies of Global Sea Level Changes from Future Space Gravity Missions

93

P. LEGRAND

C. W. HUGHES J. FLURY

P. L. WOODWORTH R. RUMMEL

/ Gravity and Topography of Moon and Planets

103

and R. RUMMEL / Science Requirements on Future Missions and Simulated Mission Scenarios

113

/ Impact of Limitations in Geophysical Background Models on Follow-On Gravity Missions

143

N. SNEEUW, J. FLURY E. J. O. SCHRAMA

 Springer 2005

Earth, Moon, and Planets (2005) 94: 1 DOI 10.1007/s11038-005-2814-5

PREFACE

In 2003, Astrium Space Industries carried out for ESA a study on the future needs for dedicated satellite gravity missions. (ESA contract no 396 2/01/NL/ GS). The title of this study was ‘‘Enabling Observation Techniques for Future Solid Earth Missions’’. The technological part of the study was based on a thorough assessment of the future needs in Earth sciences for more precise and refined gravity models. For this purpose a workshop was organized from 30 January to 1 February, 2003 at the International Space Science Institute (ISSI) in Bern/Switzerland where a group of Earth scientists exchanged their ideas with the objective given above. This collection of articles is based on the outcomes of this workshop. All articles underwent a review process according to general scientific standards. The support of ESA and of ISSI is gratefully acknowledged. We also thank Springers Astronomy and Astrophysics department for the pleasant cooperation during the preparation of this volume.

Munich, 14 June 200