GRACE FIELD GEOPOTENTIAL COEFFICIENTS GFZ RELEASE 6.0

Description

FOR EXPERT USE ONLY. This dataset contains estimates of static field geopotential of the Earth, derived from the Gravity Recovery and Climate Experiment (GRACE) mission measurements, 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
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%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://cmr.earthdata.nasa.gov%2Fvirtual-directory%2Fcollections%2FC2491772132-POCLOUD
5 https://search.earthdata.nasa.gov%2Fsearch%2Fgranules%3Fp%3DC2491772132-POCLOUD
5 https://podaac.jpl.nasa.gov%2FPodaac%2Fthumbnails%2FGRACE_GSM_L2_GRAV_GFZ_RL06.jpg
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fgrace%2Fopen%2FL1B%2FGFZ%2FAOD1B%2FRL04%2Fdocs%2FL2-UserHandbook_v4.0.pdf
34 GPM_2AGPROFTRMMTMI_CLIM.png https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/browse/GPM_2AGPROFTRMMTMI_CLIM.png
21 GPM_2AGPROFTRMMTMI_CLIM_07.html https://disc.gsfc.nasa.gov/datacollection/GPM_2AGPROFTRMMTMI_CLIM_07.html
5 GPM_2AGPROFTRMMTMI_CLIM.07 https://disc2.gesdisc.eosdis.nasa.gov/data/TRMM_L2/GPM_2AGPROFTRMMTMI_CLIM.07/
21 contents.html https://disc2.gesdisc.eosdis.nasa.gov/opendap/TRMM_L2/GPM_2AGPROFTRMMTMI_CLIM.07/contents.html
5 https://search.earthdata.nasa.gov/search?q=GPM_2AGPROFTRMMTMI_CLIM_07
5 https://gpm.nasa.gov/
33 README.TRMM.pdf https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/README.TRMM.pdf
33 ATBD_GPM_V5B_April15_2018.pdf https://pps.gsfc.nasa.gov/Documents/ATBD_GPM_V5B_April15_2018.pdf
33 filespec.GPM.V7.pdf https://gpmweb2https.pps.eosdis.nasa.gov/pub/stout/helpdesk/filespec.GPM.V7.pdf
21 gpm_anomalous.html https://gpmweb2https.pps.eosdis.nasa.gov/tsdis/AB/docs/gpm_anomalous.html
5 https://podaac.jpl.nasa.gov/CitingPODAAC
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-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 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 https://podaac.jpl.nasa.gov/GRACE
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/C2491772132-POCLOUD
5 https://search.earthdata.nasa.gov/search/granules?p=C2491772132-POCLOUD
22 GRACE_GSM_L2_GRAV_GFZ_RL06.jpg https://podaac.jpl.nasa.gov/Podaac/thumbnails/GRACE_GSM_L2_GRAV_GFZ_RL06.jpg

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  • earth-science-gravity-gravitational-field-solid-earth-gravity-anomalies

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