10.5880/COST-G.GRAVIS_02_L2B Dahle, Christoph Christoph Dahle 0000-0002-4733-9242 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Murböck, Michael Michael Murböck 0000-0002-4108-578X Institute of Geodesy, Technische Universität Berlin, Berlin, Germany GFZ Helmholtz Centre for Geosciences, Potsdam, Germany GFZ Data Services 2025 Gravity Recovery And Climate Experiment (GRACE) GRACE Follow-on (GRACE-FO) Level-2 Level-2B SHM Spherical Harmonic Model Gravitational Field GSM Geopotential Gravity Field Mass Mass Transport Total Water Storage Time Variable Gravity Mass Balance Gravity Anomaly Satellite Geodesy Earth Observation Satellites > NASA Earth System Science Pathfinder > GRACE EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITATIONAL FIELD EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY Dahle, Christoph GFZ Helmholtz Centre for Geosciences, Potsdam, Germany 2002-04 Dataset 10.5880/COST-G.ICGEM_02_L2 10.5880/COST-G.GRAVIS_02_L3_TWS 10.5880/COST-G.GRAVIS_02_L3_OBP 10.5880/COST-G.GRAVIS_02_L3_ICE 10.5880/GFZ.GRAVIS_06_L2B https://gravis.gfz.de/corrections 10.5194/essd-17-611-2025 10.3390/geosciences8090323 10.1002/2016JB013844 https://gravis.gfz.de 10.5880/COST-G.GRAVIS_01_L2B 0001 CC BY 4.0 Post-processed GRACE/GRACE-FO spherical harmonic coefficients of COST-G RL02 Level-2 GSM products representing an estimate of Earth's gravity field variations during the specified timespan. Post-processing steps comprise: (1) subtraction of a long-term mean field; (2) optionally, decorrelation and smoothing with VDK filter (anisotropic filter taking the actual error covariance information of the underlying GSM coefficients into account, see Horvath et al. (2018)); (3) replacement of coefficients C20 and C30 (only for the months within the period from 2016/11 through 2017/06) and its formal standard deviations by values estimated from a combination of GRACE/GRACE-FO and Satellite Laser Ranging (SLR); (4) subtraction of linear trend caused by Glacial Isostatic Adjustment (GIA) as provided by a numerical model; (5) insertion of geocenter coefficients (C10, C11, S11); and (6) removal of estimated aliased signal of the S2 tide (161 days period). These coefficients represent signals caused by water mass redistribution over the continents and in the oceans.

These post-processed GRACE/GRACE-FO GSM products are denoted as Level-2B products.

There are multiple variants of Level-2B products available that differ by the characteristics of the anisotropic filter applied. These variants are distinguishable by the following strings in the product file names:

- 'NFIL': Level-2B product is not filtered
- 'VDK1': Level-2B product is filtered with VDK1
- 'VDK2': Level-2B product is filtered with VDK2
- 'VDK3': Level-2B product is filtered with VDK3
- 'VDK4': Level-2B product is filtered with VDK4
- 'VDK5': Level-2B product is filtered with VDK5
- 'VDK6': Level-2B product is filtered with VDK6
- 'VDK7': Level-2B product is filtered with VDK7
- 'VDK8': Level-2B product is filtered with VDK8

The individual auxiliary data sets and models used during the post-processing steps mentioned above are provided as well (in the aux_data folder):

- 'GRAVIS-2B_COSTG_0200_2002095-2020091_NFIL_0001.gz': Long-term mean field calculated as unweighted average of the 183 available GFZ RL06 GSM products in the period from 2002/04 through 2020/03

- 'GRAVIS-2B_COSTG_0200_GRACE+SLR_LOW_DEGREES_0001.dat': Time series of coefficients C20, C30, C21 and S21 estimated from a combination of GRACE/GRACE-FO and SLR

- 'GRAVIS-2B_COSTG_0200_GIA_ICE-6G_D_VM5a_0001.gz': Model from Peltier et al. (2018) for subtraction of linear trend caused by GIA

- 'GRAVIS-2B_COSTG_0200_GEOCENTER_0001.dat': Time series with geocenter coefficients estimated from COST-G RL02.1

Further information about the Level-2B products and the auxiliary data is provided in the header of the corresponding data files.


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Version History:

22 July 2025:
Initial release of the data (Version 0001).
-180 180 -90 90