Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present
FOR EXPERT USE ONLY. This dataset contains estimates of the total month-by-month geopotential of the Earth, derived from the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission measurements, produced by the Center for Space Research (CSR) at University of Texas at Austin. The data a...
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dataone:doi:10.5067/GFL20-MC060 2024-06-03T18:46:42+00:00 Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present Physical Oceanography Distributed Active Archive Center Global ENVELOPE(-180.0,180.0,89.0,-89.0) BEGINDATE: 2018-05-22T00:00:00Z ENDDATE: 2018-05-22T00:00:00Z 2019-01-01T00:00:00Z https://doi.org/10.5067/GFL20-MC060 unknown Arctic Data Center Arctic Report Card 2020 Dataset 2019 dataone:urn:node:ARCTIC https://doi.org/10.5067/GFL20-MC060 2024-06-03T18:16:55Z FOR EXPERT USE ONLY. This dataset contains estimates of the total month-by-month geopotential of the Earth, derived from the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission measurements, produced by the Center for Space Research (CSR) at University of Texas at Austin. The data are provided in spherical harmonic coefficients, averaged over approximately a month. The primary objective of the GRACE-FO mission is to obtain accurate estimates of the mean and time-variable components of the gravity field and corresponding Earth mass change variations, such as from polar ice sheets and mountain glaciers; total water storage on land (from groundwater changes in deep aquifers to changes in soil moisture and surface water); changes in deep ocean currents; and changes within the solid Earth itself, such as postglacial rebound and the impact of major earthquakes. This objective is achieved by making continuous measurements of the change in distance between twin spacecraft, co-orbiting in about 490 kilometers (km) altitude, near circular, polar orbit, spaced approximately 220+/-50 km apart, using a microwave ranging system. In addition to these inter-satellite range changes, the non-gravitational forces acting on each satellite are measured using a high accuracy electrostatic accelerometer. The satellite orientation and position (and timing) are precisely measured using star cameras (with three heads per satellite) and a Global Positioning System (GPS) receiver. Spatial and temporal variations in the gravity field perturb the orbits (or trajectories) of the twin spacecraft differently. These differences lead to minute changes (on the order of tens of micrometers per second) in the distance between the spacecraft as they orbit the Earth. This change in distance (or range rate) 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 geopotential coefficients of an Earth gravity field model, typically on a per-month basis. GRACE-FO. 2019. GRACEFO_L2_CSR_MONTHLY_0060. Ver. 6. PO.DAAC, CA, USA. Dataset accessed [2020-10-19] at https://doi.org/10.5067/GFL20-MC060 Dataset Arctic Arctic Data Center (via DataONE) Arctic Austin ENVELOPE(-180.0,180.0,89.0,-89.0) |
institution |
Open Polar |
collection |
Arctic Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:ARCTIC |
language |
unknown |
topic |
Arctic Report Card 2020 |
spellingShingle |
Arctic Report Card 2020 Physical Oceanography Distributed Active Archive Center Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present |
topic_facet |
Arctic Report Card 2020 |
description |
FOR EXPERT USE ONLY. This dataset contains estimates of the total month-by-month geopotential of the Earth, derived from the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission measurements, produced by the Center for Space Research (CSR) at University of Texas at Austin. The data are provided in spherical harmonic coefficients, averaged over approximately a month. The primary objective of the GRACE-FO mission is to obtain accurate estimates of the mean and time-variable components of the gravity field and corresponding Earth mass change variations, such as from polar ice sheets and mountain glaciers; total water storage on land (from groundwater changes in deep aquifers to changes in soil moisture and surface water); changes in deep ocean currents; and changes within the solid Earth itself, such as postglacial rebound and the impact of major earthquakes. This objective is achieved by making continuous measurements of the change in distance between twin spacecraft, co-orbiting in about 490 kilometers (km) altitude, near circular, polar orbit, spaced approximately 220+/-50 km apart, using a microwave ranging system. In addition to these inter-satellite range changes, the non-gravitational forces acting on each satellite are measured using a high accuracy electrostatic accelerometer. The satellite orientation and position (and timing) are precisely measured using star cameras (with three heads per satellite) and a Global Positioning System (GPS) receiver. Spatial and temporal variations in the gravity field perturb the orbits (or trajectories) of the twin spacecraft differently. These differences lead to minute changes (on the order of tens of micrometers per second) in the distance between the spacecraft as they orbit the Earth. This change in distance (or range rate) 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 geopotential coefficients of an Earth gravity field model, typically on a per-month basis. GRACE-FO. 2019. GRACEFO_L2_CSR_MONTHLY_0060. Ver. 6. PO.DAAC, CA, USA. Dataset accessed [2020-10-19] at https://doi.org/10.5067/GFL20-MC060 |
format |
Dataset |
author |
Physical Oceanography Distributed Active Archive Center |
author_facet |
Physical Oceanography Distributed Active Archive Center |
author_sort |
Physical Oceanography Distributed Active Archive Center |
title |
Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present |
title_short |
Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present |
title_full |
Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present |
title_fullStr |
Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present |
title_full_unstemmed |
Gravity Recovery and Climate Experiment Follow-On Level-2 Monthly Geopotential Spherical Harmonics Center for Space Research Release 6.0 (RL06), 2018-present |
title_sort |
gravity recovery and climate experiment follow-on level-2 monthly geopotential spherical harmonics center for space research release 6.0 (rl06), 2018-present |
publisher |
Arctic Data Center |
publishDate |
2019 |
url |
https://doi.org/10.5067/GFL20-MC060 |
op_coverage |
Global ENVELOPE(-180.0,180.0,89.0,-89.0) BEGINDATE: 2018-05-22T00:00:00Z ENDDATE: 2018-05-22T00:00:00Z |
long_lat |
ENVELOPE(-180.0,180.0,89.0,-89.0) |
geographic |
Arctic Austin |
geographic_facet |
Arctic Austin |
genre |
Arctic |
genre_facet |
Arctic |
op_doi |
https://doi.org/10.5067/GFL20-MC060 |
_version_ |
1800870045334634496 |