GRACE NON-TIDAL OCEAN GEOPOTENTIAL COEFFICIENTS GFZ RELEASE 6.0 GAB

Description

FOR EXPERT USE ONLY. This dataset contains estimates of geopotential field derived from the Gravity Recovery and Climate Experiment (GRACE) mission measurements and a non-tidal oceanic model produced by the German Research Centre for Geosciences (GFZ). The data are in spherical harmonics averaged over approximately a month. The primary objective of the GRACE mission is to obtain accurate estimates of the mean and time-variable components of the gravity field variations. This objective is achieved by making continuous measurements of the change in distance between twin spacecraft, co-orbiting in about 500 km altitude, near circular, polar orbit, spaced approximately 200 km apart, using a microwave ranging system. In addition to these range change, the non-gravitional forces are measured on each satellite using a high accuracy electrostatic, room-temperature accelerometer. The satellite orientation and position (and timing) are precisely measured using twin star cameras and a GPS receiver, respectively. Spatial and temporal variations in the gravity field affect the orbits (or trajectories) of the twin spacecraft differently. These differences are manifested as changes in the distance between the spacecraft, as they orbit the Earth. This change in distance is reflected in the time-of-flight of microwave signals transmitted and received nearly simultaneously between the two spacecraft. The change in this time of fight is continuously measured by tracking the phase of the microwave carrier signals. The so called dual-one-way range change measurements can be reconstructed from these phase measurements. This range change (or its numerically derived derivatives), along with other mission and ancillary data, is subsequently analyzed to extract the parameters of an Earth gravity field model.

Resources

Name Format Description Link
34 GPSROZPBLS_2.png https://docserver.gesdisc.eosdis.nasa.gov/public/project/MEaSUREs/BLH/Images/GPSROZPBLS_2.png
21 GPSROZPBLS_2.html https://disc.gsfc.nasa.gov/datacollection/GPSROZPBLS_2.html
5 https://measures.gesdisc.eosdis.nasa.gov/data/BoundaryLayerDepth/GPSROZPBLS.2/
5 https://measures.gesdisc.eosdis.nasa.gov/opendap/BoundaryLayerDepth/GPSROZPBLS.2/
33 README_BoundaryLayerDepth_V2.pdf https://measures.gesdisc.eosdis.nasa.gov/data/BoundaryLayerDepth/GPSROZPBLS.2/doc/README_BoundaryLayerDepth_V2.pdf
5 https://search.earthdata.nasa.gov/search?q=GPSROZPBLS
5 https://genesis.jpl.nasa.gov/genesis/
5 https://podaac.jpl.nasa.gov%2FCitingPODAAC
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fgrace%2Fopen%2FL1B%2FGFZ%2FAOD1B%2FRL04%2Fdocs%2FL2-UserHandbook_v4.0.pdf
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fgrace%2Fopen%2FL1B%2FGFZ%2FAOD1B%2FRL04%2Fdocs%2FProdSpecDoc_v4.6.pdf
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fgrace%2Fopen%2FL1B%2FGFZ%2FAOD1B%2FRL04%2Fdocs%2FReleaseNotes_gfz_RL06.pdf
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fgrace%2Fretired%2Fdocs%2FL2-GFZ_ProcStds_RL06_DRAFT.pdf
5 https://podaac.jpl.nasa.gov%2FGRACE
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fgracefo%2Fopen%2FL2%2FGFZ%2FRL06%2FREADME.txt
5 https://search.earthdata.nasa.gov%2Fsearch%2Fgranules%3Fp%3DC2491772116-POCLOUD
5 https://podaac.jpl.nasa.gov%2FPodaac%2Fthumbnails%2FGRACE_GAB_L2_GRAV_GFZ_RL06.jpg
5 https://cmr.earthdata.nasa.gov%2Fvirtual-directory%2Fcollections%2FC2491772116-POCLOUD
5 https://podaac.jpl.nasa.gov/CitingPODAAC
33 L2-UserHandbook_v4.0.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/L2-UserHandbook_v4.0.pdf
33 ProdSpecDoc_v4.6.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/ProdSpecDoc_v4.6.pdf
33 ReleaseNotes_gfz_RL06.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/ReleaseNotes_gfz_RL06.pdf
33 L2-GFZ_ProcStds_RL06_DRAFT.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/retired/docs/L2-GFZ_ProcStds_RL06_DRAFT.pdf
5 README.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/gracefo/open/L2/GFZ/RL06/README.txt
5 https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2491772116-POCLOUD
5 https://search.earthdata.nasa.gov/search/granules?p=C2491772116-POCLOUD
22 GRACE_GAB_L2_GRAV_GFZ_RL06.jpg https://podaac.jpl.nasa.gov/Podaac/thumbnails/GRACE_GAB_L2_GRAV_GFZ_RL06.jpg
5 https://podaac.jpl.nasa.gov/GRACE
5 https://podaac.jpl.nasa.gov/CitingPODAAC
33 L2-UserHandbook_v4.0.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/L2-UserHandbook_v4.0.pdf
33 ReleaseNotes_gfz_RL06.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/ReleaseNotes_gfz_RL06.pdf
33 L2-GFZ_ProcStds_RL06_DRAFT.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/retired/docs/L2-GFZ_ProcStds_RL06_DRAFT.pdf
5 README.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/gracefo/open/L2/GFZ/RL06/README.txt
5 https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2491772116-POCLOUD
5 https://search.earthdata.nasa.gov/search/granules?p=C2491772116-POCLOUD
33 ProdSpecDoc_v4.6.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/grace/open/L1B/GFZ/AOD1B/RL04/docs/ProdSpecDoc_v4.6.pdf
5 https://podaac.jpl.nasa.gov/GRACE
22 GRACE_GAB_L2_GRAV_GFZ_RL06.jpg https://podaac.jpl.nasa.gov/Podaac/thumbnails/GRACE_GAB_L2_GRAV_GFZ_RL06.jpg

Tags

  • earth-science-gravity-gravitational-field-solid-earth-gravity-anomalies
  • earth-science-ocean-pressure-oceans-ocean-bottom-pressure

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