10.5880/ICGEM.2019.003 Brockmann, Jan Martin Jan Martin Brockmann 0000-0002-7647-4515 Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany Schubert, Till Till Schubert 0000-0001-5192-6629 Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany Mayer-Gürr, Torsten Torsten Mayer-Gürr 0000-0003-2609-428X Institute of Geodesy, Theoretical Geodesy and Satellite Geodesy Group, TU Graz, Austria Schuh, Wolf-Dieter Wolf-Dieter Schuh 0000-0002-3522-3146 Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany GFZ Data Services 2019 ICGEM global gravitational model GOCE EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY Ince, Elmas Sinem Elmas Sinem Ince 0000-0002-3393-1392 GFZ German Research Centre for Geosciences, Potsdam, Germany Reißland, Sven Sven Reißland 0000-0001-6293-5336 GFZ German Research Centre for Geosciences, Potsdam, Germany Brockmann, Jan Martin Institute of Geodesy and Geoinformation, Theoretical Geodesy Group, University of Bonn, Germany ICGEM Support GFZ German Research Centre for Geosciences, Potsdam, Germany Dataset http://nbn-resolving.de/urn:nbn:de:hbz:5n-38608 10.1002/2014GL061904 10.5194/essd-11-647-2019 10.1007/s00190-004-0413-2 10.1007/s00190-011-0467-x http://icgem.gfz-potsdam.de 10.1007/s10712-020-09626-0 CC BY 4.0 The static gravitational model GO_CONS_GCF_2_TIM_R6 Is the 6th release of the GOCE gravity field model by means of the time-wise approach.

GOCE Input Data:

- Gradients: EGG_NOM_2 (re-calibration, released 2018, version 0202)

- Orbits:
-- SST_PKI (kinematic orbits); SST_PCV (variance information of kinematic orbit positions),
-- SST_RNX (original RINEX orbit data)

- Attitude: EGG_IAQ_2C
- Non-conservative accelerations: EGG_CCD_2C
- Data period: 09/10/2009 - 20/10/2013

No static a-priori gravity field information applied (neither as reference model, nor for constraining the solution)


Processing procedures:

- Gravity from orbits (SST):
- short-arc integral method applied to kinematic orbits, up to degree/order 150
- orbit variance information included as part of the stochastic model, it is refined by empirical covariance functions

- Gravity from gradients (SGG):
- parameterization up to degree/order 300
- observations used: Vxx, Vyy, Vzz and Vxz in the Gradiometer Reference Frame (GRF)
- realistic stochastic modelling by applying digital decorrelation filters to the observation equations; estimated separately for individual data segments applying a robust procedure

- Combined solution:
- addition of normal equations (SST D/O 150, SGG D/O 300)
- Constraints:
* Kaula-regularization applied to coefficients of degrees/orders 201 - 300 (constrained towards zero)
* observation equations for zero gravity anomaly observations in polar regions (>83°) to constrain polar gaps towards zero (degree 11 to 300)

- Optimum weighting (SST, SGG, constraints) based on variance component estimation


Specific features of resulting gravity field:

- Gravity field solution is independent of any other gravity field information
- Constraint towards zero starting from degree/order 201 to improve signal-to-noise ratio
- Related variance-covariance information represents very well the true errors of the coefficients
- Solution can be used for independent comparison and combination on normal equation level with other satellite-only models (e.g. GRACE), terrestrial gravity data, and altimetry
- Since in the low degrees the solution is based solely on GOCE orbits, it is not competitive with a GRACE model in this spectral region is available via this data publication and via ICGEM (Ince et al., 2019). Link to ICGEM Website: http://icgem.gfz-potsdam.de
- The reference epoch is 2010-01-01 (MJD 55197)

Further processing details can be found in Brockmann (2014), Brockmann et al. (2014, 2021) Mayer-Gürr et al. (2005) and Pail et al. (2014).
-180 180 -90 90