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GRACE Earh Gravity Field Level 2 Collection

The GRACE level-2 products are the main outputs from the GRACE and GRACE-FO missions. They consist of the time average (10-day, monthly) solutions of the Earth gravity field in spherical harmonics.


GRACE is a joint project between the National Aeronautics and Space Administration ( NASA ) and the Deutsches Zentrum für Luft- und Raumfahrt ( DLR ). The mission has been proposed in 1996 jointly by the University of Texas at Austin, Center for Space Research ( UTCSR ), the German Research Centre for Geosciences ( GFZ ) and the Jet Propulsion Laboratories (JPL) in Pasadena. GRACE was selected in 1997 as second mission in NASA's Earth System Science Pathfinder ( ESSP ) program. As an innovation, the Principal Investigator Prof. Byron Tapley (UTCSR) and his team are ultimately responsible for developing the flight mission hardware from selection to a launch-ready condition, for accomplishing the scientific objectives and delivering the proposed measurements to the broader Earth science community and general public as expediently as possible. Co-Principal Investigator of the mission is Dr. Frank Flechtner (GFZ). Project management and systems engineering activities are carried out by JPL.


GRACE-FO is a joint project between the National Aeronautics and Space Administration ( NASA ) and the GeoForschungsZentrum ( GFZ ) Potsdam. GRACE-FO, launched May 22, 2018, is a successor to the original GRACE mission. The Principal Investigator at NASA JPL is Felix landerer. Co-Principal Investigator of the mission is Dr. Frank Flechtner (GFZ). Project management and systems engineering activities are carried out by JPL.

Simple

Date (Révision)
2022-01-06
Identificateur
CNES:GRACE:RL05

But

The primary science objective of the GRACE and GRACE-FO missions is to measure the Earth’s gravity field and it’s time variability with unprecedented accuracy. The increase in accuracy has been achieved by utilizing two satellites following each other on the same orbital track. To consider precise attitude and non-gravitational forces both satellites are equipped with star cameras and accelerometers. The position and velocity of the satellites is measured using onboard GPS antennae and (for validation purposes) SLR retro-reflectors. Additionally, the twin satellites are interconnected by a K-band microwave link to measure the exact separation distance and its rate of change to an accuracy of better than 0.1 µm/s. These measurements are directly coupled to the seasonal and sub-seasonal variations in the continental hydrological cycle, to ice mass loss in the large glacier systems in Greenland or Antarctica, to long wavelength ocean circulation processes or to the transport of ocean heat to Earth’s poles. Additionally, GRACE provides the time variability of the Earth’ overall external shape, the geoid. Consequently, since its launch in March 2002 this fundamental dataset has enabled dramatic improvements of seasonal and inter-annual climate change estimates.


The secondary science objective of the GRACE and GRACE-FO missions is to obtain about 150 very precise globally distributed vertical temperature and humidity profiles of the atmosphere per day using the GPS radio occultation technique.

Etat
Mise à jour continue
Point de contact
  CNES CNES CNES - ( )
Fréquence de mise à jour
Lorsque nécessaire
Mots clés
  • Geodynamic

  • Gravitational field

FormaTerre | Solid Earth Discipline ontology
  • Géomagnétisme
FormaTerre | Distributor
  • CNES
Contraintes d'utilisation
Autres restrictions
Autres contraintes

Data is public, although an ISDC account is mandatory

Type de représentation spatiale
Raster
Distance de résolution
100  km
Langue de la ressource

eng

Encodage des caractères
Utf8
Catégorie ISO
  • Sciences de la terre, géosciences
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Date de début
2002-03-17
Nom du système de référence
WGS 1984
Format (encodage)
  • ASCII ( )

  CNES CNES CNES -
Ressource en ligne
Product description ( WWW:LINK-1.0-http--link )
Ressource en ligne
Average trend of the gravity signal ( WTS )

Gravity signal from GRACE and GRACE-FO (in Equivalent Water Heights), average trend

Ressource en ligne
Average semiannual of the gravity signal ( WTS )

Gravity signal from GRACE and GRACE-FO (in Equivalent Water Heights), average semiannual signal

Ressource en ligne
Average annual of the gravity signal ( WTS )

Gravity signal from GRACE and GRACE-FO (in Equivalent Water Heights), average annual signal

Ressource en ligne
Product download ( WWW:LINK-1.0-http--link )
Ressource en ligne
The Grace Plotter ( WWW:LINK-1.0-http--link )

Visualization service

Ressource en ligne
Cylindrical Gravity Anomalies ( WWW:LINK-1.0-http--link )
Ressource en ligne
Polar Gravity Anomalies ( WWW:LINK-1.0-http--link )
Ressource en ligne
Cylindrical Geoid Height Comparison ( WWW:LINK-1.0-http--link )
Ressource en ligne
Polar Geoid Height Comparison ( WWW:LINK-1.0-http--link )
Ressource en ligne
Cylindrical Water Heights Comparison ( WWW:LINK-1.0-http--link )
Ressource en ligne
Polar Water Heights Comparison ( WWW:LINK-1.0-http--link )
Niveau
Collection de données

Etendue

No information provided.
Généralités sur la provenance

Based on the time-variable (monthly or 10-day) solutions CNES/GRGS RL04, a mean Earth gravity field model complete to degree and order 300 has been computed: EIGEN-GRGS.RL04.MEAN-FIELD.linear_mean_pole.zero_slope_extrapolation. It contains time-variable coefficients up to degree and order 90. For the higher degree part, it is based on a combined GRACE+GOCE static model: EIGEN-6C. This model has been used for Precise Orbit Determination of the altimetry satellites following the GDR-E standards

Identifiant de la fiche
e747d804-a5d1-4fd1-bd9b-306a8ebd4904 XML
Langue
Français
Jeu de caractères
Utf8
Type de ressource
Collection de données
Date des métadonnées
2024-05-03T10:40:03
Nom du standard de métadonnées

ISO 19115:2003/19139

Version du standard de métadonnées

1.0

Point de contact
  CNES CNES CNES - ( )
 
 

Aperçus

Capture signal gravitaire

Étendue spatiale

N
S
E
W


Mots clés


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Ressources associées

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