10.5880/GFZ.GRAVIS_06_L2B Dahle, Christoph Christoph Dahle 0000-0002-4733-9242 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Murböck, Michael Michael Murböck 0000-0002-4108-578X GFZ Helmholtz Centre for Geosciences, Potsdam, Germany GFZ Data Services 2019 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 Christoph Dahle 0000-0002-4733-9242 GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Murböck, Michael Michael Murböck 0000-0002-4108-578X GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Dahle, Christoph GFZ Helmholtz Centre for Geosciences, Potsdam, Germany Dahle, Christoph GFZ Helmholtz Centre for Geosciences, Potsdam, Germany 2002-04 Dataset 10.5880/GFZ.GRACE_06_GSM 10.5880/GFZ.GRACEFO_06_GSM 10.5880/GFZ.GRAVIS_06_L3_TWS 10.5880/GFZ.GRAVIS_06_L3_OBP 10.5880/GFZ.GRAVIS_06_L3_ICE https://gravis.gfz.de/corrections 10.5194/essd-17-611-2025 10.3390/geosciences8090323 10.1002/2016JB013844 10.5880/COST-G.GRAVIS_02_L2B https://gravis.gfz.de 0004 CC BY 4.0 Post-processed GRACE/GRACE-FO spherical harmonic coefficients of GFZ RL06 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, C30 (only for the months within the period from 2016/11 through 2017/06), C21 and S21 (only for the months within the period from 2002/04 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_2002095-2020091_GFZOP_0600_NFIL_0004.gz': Long-term mean field calculated as unweighted average of the 183 available GFZ RL06 GSM products in the period from 2002/04 up to and including 2020/03.
- 'GRAVIS-2B_GFZOP_GRACE+SLR_LOW_DEGREES_0004.dat': time series of coefficients C20, C30, C21 and S21 estimated from a combination of GRACE/GRACE-FO and SLR
- 'GRAVIS-2B_GIA_ICE-6G_D_VM5a_0004.gz': Model from Peltier et al. (2018) for subtraction of linear trend caused by GIA
- 'GRAVIS-2B_GFZOP_GEOCENTER_0004.dat': Time series with geocenter coefficients estimated from GFZ RL06

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

---------------------------------------------------------------------------------------------

Version History:

16 January 2025:
Release of Version 0004. This is an update of Version 0003 of the same data set (see changelog).

21 April 2023:
Release of Version 0003. This is an update of Version 0002 of the same data set (see changelog).

09 June 2020:
Release of Version 0002. This is an update of Version 0001 of the same data set (see changelog).

All changes and updates are documented in the changelog available via the data download section. Previously released versions of this data set are available in the "old_versions" subfolder in the data download folder.

-180 180 -90 90