Released
Dataset

Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product)

Cite as:

Dahle, Christoph; Murböck, Michael (2019): Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product). V. 0001. GFZ Data Services. http://doi.org/10.5880/GFZ.GRAVIS_06_L2B

Status

I   N       R   E   V   I   E   W : Dahle, Christoph; Murböck, Michael (2019): Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product). V. 0001. GFZ Data Services. http://doi.org/10.5880/GFZ.GRAVIS_06_L2B

Abstract

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 coefficient C20 and its uncertainty by values estimated from Satellite Laser Ranging (SLR); (4) subtraction of linear trend caused by Glacial Isostatic Adjustment (GIA) as provided by a numerical model; (5) insertion of coefficients of degree 1; and (6) removal of estimated signal with 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
- 'VDK2': Level-2B product is filtered with VDK2
- 'VDK3': Level-2B product is filtered with VDK3
- 'VDK5': Level-2B product is filtered with VDK5

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

- 'GRAVIS-2B_2002095-2016247_GFZOP_0600_NFIL_0001.gz': Long-term mean field calculated as unweighted average of the 156 available GFZ RL06 GSM products in the period from 2002/04 up to and including 2016/08.
- 'GFZ_RL06_C20_SLR.dat': C20 time series from SLR (http://doi.org/10.5880/GFZ.GRAVIS_06_C20_SLR)
- 'GRAVIS-2B_GIA_ICE5G_VILMA.gz': Model for subtraction of linear trend caused by GIA
- 'GRAVIS-2B_DEG1_v01.dat': Degree-1 time series

Detailed information about the product is provided in the header of the data file.

Contact

  • Dahle, Christoph; GFZ German Research Centre for Geosciences, Potsdam, Germany;

Contributors

König, Rolf; Schreiner, Patrick; Klemann, Volker; Dobslaw, Henryk

Keywords

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

GCMD Science Keywords

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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-4108-578X
          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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        • title (xml:lang=eng): Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product)
      • publisher: GFZ Data Services
      • publicationYear: 2019
      • subjects
        • subject: Gravity Recovery And Climate Experiment (GRACE)
        • subject: GRACE Follow-on (GRACE-FO)
        • subject: Level-2
        • subject: Level-2B
        • subject: SHM
        • subject: Spherical Harmonic Model
        • subject: Gravitational Field
        • subject: GSM
        • subject: Geopotential
        • subject: Gravity Field
        • subject: Mass
        • subject: Mass Transport
        • subject: Total Water Storage
        • subject: Time Variable Gravity
        • subject: Mass Balance
        • subject: Gravity Anomaly
        • subject: Satellite Geodesy
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        • subject (subjectScheme=GCMD Platforms xml:lang=en): Earth Observation Satellites > NASA Earth System Science Pathfinder > GRACE
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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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          • familyName: Dobslaw
          • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0003-1776-3314
          • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
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      • language: eng
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      • Entry_Title: Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product)
      • Data_Set_Citation
        • Dataset_Creator: Dahle, Christoph; Murböck, Michael
        • Dataset_Title: Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product)
        • Dataset_Release_Date: 2019
        • Dataset_Release_Place: Potsdam, Germany
        • Dataset_Publisher: GFZ Data Services
        • Online_Resource: http://dx.doi.org/10.5880/GFZ.GRAVIS_06_L2B
      • Parameters
        • Category: EARTH SCIENCE
        • Topic: SOLID EARTH
        • Term: GRAVITY/GRAVITATIONAL FIELD
        • Variable_Level_1: GRAVITY
      • Parameters
        • Category: EARTH SCIENCE
        • Topic: SOLID EARTH
        • Term: GRAVITY/GRAVITATIONAL FIELD
        • Variable_Level_1: GRAVITATIONAL FIELD
      • ISO_Topic_Category: geoscientificInformation
      • Keyword: Gravity Recovery And Climate Experiment (GRACE)
      • Keyword: GRACE Follow-on (GRACE-FO)
      • Keyword: Level-2
      • Keyword: Level-2B
      • Keyword: SHM
      • Keyword: Spherical Harmonic Model
      • Keyword: Gravitational Field
      • Keyword: GSM
      • Keyword: Geopotential
      • Keyword: Gravity Field
      • Keyword: Mass
      • Keyword: Mass Transport
      • Keyword: Total Water Storage
      • Keyword: Time Variable Gravity
      • Keyword: Mass Balance
      • Keyword: Gravity Anomaly
      • Keyword: Satellite Geodesy
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        • Northernmost_Latitude: 90
        • Westernmost_Longitude: -180
        • Easternmost_Longitude: 180
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          • Last_Name: Deutsches GeoForschungsZentrum GFZ
      • Summary
        • Abstract: 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 coefficient C20 and its uncertainty by values estimated from Satellite Laser Ranging (SLR); (4) subtraction of linear trend caused by Glacial Isostatic Adjustment (GIA) as provided by a numerical model; (5) insertion of coefficients of degree 1; and (6) removal of estimated signal with 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 - 'VDK2': Level-2B product is filtered with VDK2 - 'VDK3': Level-2B product is filtered with VDK3 - 'VDK5': Level-2B product is filtered with VDK5 The individual data sets and models used during the post-processing steps mentioned above are provided as well (in the aux_data folder): - 'GRAVIS-2B_2002095-2016247_GFZOP_0600_NFIL_0001.gz': Long-term mean field calculated as unweighted average of the 156 available GFZ RL06 GSM products in the period from 2002/04 up to and including 2016/08. - 'GFZ_RL06_C20_SLR.dat': C20 time series from SLR (http://doi.org/10.5880/GFZ.GRAVIS_06_C20_SLR) - 'GRAVIS-2B_GIA_ICE5G_VILMA.gz': Model for subtraction of linear trend caused by GIA - 'GRAVIS-2B_DEG1_v01.dat': Degree-1 time series Detailed information about the product is provided in the header of the data file.
      • Metadata_Name: DIF
      • Metadata_Version: 9.8.2
  • escidoc:  /  download xml
    • resource
      • title (xml:lang=eng): Post-processed GRACE/GRACE-FO Geopotential GSM Coefficients GFZ RL06 (Level-2B Product)
      • creator
        • creatorName: Dahle, Christoph
        • givenName: Christoph
        • familyName: Dahle
        • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-4733-9242
        • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
      • creator
        • creatorName: Murböck, Michael
        • givenName: Michael
        • familyName: Murböck
        • nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-4108-578X
        • affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany

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