The gravity recovery and climate experiment: Mission overview and early results
TLDR
In this paper, the gravity models developed with this data are more than an order of magnitude better at the long and mid wavelengths than previous models and the error estimates indicate a 2-cm accuracy uniformly over the land and ocean regions, a consequence of the highly accurate, global and homogenous nature of the GRACE data.Abstract:
[1] The GRACE mission is designed to track changes in the Earth's gravity field for a period of five years. Launched in March 2002, the two GRACE satellites have collected nearly two years of data. A span of data available during the Commissioning Phase was used to obtain initial gravity models. The gravity models developed with this data are more than an order of magnitude better at the long and mid wavelengths than previous models. The error estimates indicate a 2-cm accuracy uniformly over the land and ocean regions, a consequence of the highly accurate, global and homogenous nature of the GRACE data. These early results are a strong affirmation of the GRACE mission concept.read more
Citations
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Journal ArticleDOI
GRACE measurements of mass variability in the Earth system.
TL;DR: Geoid variations observed over South America that can be largely attributed to surface water and groundwater changes show a clear separation between the large Amazon watershed and the smaller watersheds to the north.
Journal ArticleDOI
The development and evaluation of the Earth Gravitational Model 2008 (EGM2008)
TL;DR: EGM2008 as mentioned in this paper is a spherical harmonic model of the Earth's gravitational potential, developed by a least squares combination of the ITG-GRACE03S gravitational model and its associated error covariance matrix, with the gravitational information obtained from a global set of area-mean free-air gravity anomalies defined on a 5 arc-minute equiangular grid.
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Bedmap2: improved ice bed, surface and thickness datasets for Antarctica
Peter T. Fretwell,Hamish D. Pritchard,David G. Vaughan,Jonathan L. Bamber,Nicholas E. Barrand,Ruth Bell,Cesidio Bianchi,Robert Bingham,Donald D. Blankenship,Gino Casassa,Ginny A. Catania,Denis Callens,Howard Conway,Alison J. Cook,Hugh F. J. Corr,Detlef Damaske,Volkmar Damm,Fausto Ferraccioli,René Forsberg,Shuji Fujita,Y. Gim,Prasad Gogineni,J. A. Griggs,Richard C. A. Hindmarsh,Per Holmlund,John W. Holt,Robert W. Jacobel,Adrian Jenkins,Wilfried Jokat,Tom A. Jordan,Edward C. King,Jack Kohler,William B. Krabill,M. Riger-Kusk,Kirsty Langley,German Leitchenkov,Carl Leuschen,Bruce P. Luyendyk,Kenichi Matsuoka,Jeremie Mouginot,F. O. Nitsche,Yoshifumi Nogi,Ole Anders Nøst,S. V. Popov,Eric Rignot,David M. Rippin,Andrés Rivera,Jason L. Roberts,Neil Ross,Martin J. Siegert,Andrew Smith,Daniel Steinhage,Michael Studinger,Bo Sun,B. K. Tinto,Brian C. Welch,Douglas S. Wilson,Duncan A. Young,Cui Xiangbin,Achille Zirizzotti +59 more
TL;DR: Bedmap2 as discussed by the authors is a suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60° S. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used in Bedmap1.
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Post‐processing removal of correlated errors in GRACE data
Sean Swenson,John Wahr +1 more
TL;DR: The authors examined the spectral signature of these correlated errors, and presented a method to remove them, and applied the filter to a model of surface-mass variability to show that the filter has relatively little degradation of the underlying geophysical signals we seek to recover.
Journal ArticleDOI
A review of global terrestrial evapotranspiration: observation, modeling, climatology, and climatic variability
Kaicun Wang,Robert E. Dickinson +1 more
TL;DR: In this paper, the authors survey the basic theories, observational methods, satellite algorithms, and land surface models for terrestrial evapotranspiration, including a long-term variability and trends perspective.
References
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Journal ArticleDOI
Large Scale Ocean Circulation from the GRACE GGM01 Geoid
TL;DR: In this article, the GRACE Gravity Model 01 (GGM01), computed from 111 days of GRACE K-band ranging data, is differenced from a global mean sea surface (MSS) computed from a decade of satellite altimetry to determine a mean dynamic ocean topography (DOT).
Journal Article
The CHAMP geopotential mission
TL;DR: The German small satellite mission CHAMP as mentioned in this paper was the first mission aiming at the simultaneous precise observation of both the gravity and magnetic field from a low altitude orbit, which was successfully launched on 15 July 2000.
Journal Article
Accelerometers for CHAMP, GRACE and GOCE space missions: synergy and evolution
TL;DR: In this paper, the Super-STAR accelerometer is used for the measurement of the non-gravitational accelerations which perturb the low-altitude orbit to be finely determined from the on-board GPS receiver, aiming at the recovery of the Earth's gravity field.
Instrument of Grace: GPS augments gravity measurements
Charles Dunn,Willy Bertiger,Yoaz Bar-Sever,Shailen D. Desai,Bruce J. Haines,Da Kuang,Garth Franklin,Ian Harris,Gerhard Kruizinga,T. K. Meehan,Sumita Nandi,Don J Nguyen,Tim Rogstad,J. Brooks Thomas,Jeff Tien,Larry Romans,Michael M. Watkins,Sien Chong Wu,Srinivas Bettadpur,Jeongrae Kim +19 more
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Error Analysis of a Low-Low Satellite-to-Satellite Tracking Mission
Jeongrae Kim,Byron D. Tapley +1 more
TL;DR: The Gravity Recovery and Climate Experiment (GRCE) as mentioned in this paper is a dedicated spaceborne mission whose objective is to map the gravity field with unprecedented accuracy, which consists of two satellites coorbiting in a nearly polar orbit at low altitude.