Correction of GRACE measurements of the Earth's moment of inertia (MOI)
The widely used 15-year Gravity Recovery and Climate Experiment (GRACE) data sets do not conserve global total mass. They have a spurious decreasing trend of similar to 280 Gt/year. Various regions contribute differently to the global total mass loss error, with the Greenland Ice Sheet (GrIS) genera...
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Online Access: | https://doi.org/10.1007/s00382-021-06022-1 |
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ftncar:oai:drupal-site.org:articles_25312 2024-04-28T08:21:59+00:00 Correction of GRACE measurements of the Earth's moment of inertia (MOI) Ren, Diandong (author) Leslie, Lance M. (author) Huang, Ying (author) Hu, Aixue (author) 2022-05 https://doi.org/10.1007/s00382-021-06022-1 en eng Climate Dynamics--Clim Dyn--0930-7575--1432-0894 articles:25312 doi:10.1007/s00382-021-06022-1 ark:/85065/d71r6v5w Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2022 ftncar https://doi.org/10.1007/s00382-021-06022-1 2024-04-04T17:35:13Z The widely used 15-year Gravity Recovery and Climate Experiment (GRACE) data sets do not conserve global total mass. They have a spurious decreasing trend of similar to 280 Gt/year. Various regions contribute differently to the global total mass loss error, with the Greenland Ice Sheet (GrIS) generating similar to 10% of the error alone. Atmospheric parameters from reanalysis datasets drive a well-tested ice model to generate mass variation time series over the GrIS for 2002-2015. Because shorter timescale spikes of similar to 10-30 Gt in GRACE measurements are physically based, only the overall trend of similar to 30 Gt/year requires correcting. A more accurate mass loss rate estimate for 2002-2015 is similar to 120 Gt/year, considerably below previous estimates. With the water redistribution to lower latitudes and other effects from a warming climate, the nontidal Earth moment of inertia (MOI) also increases. After rectification, the GRACE measured mass redistribution shows a steady, statistically robust (passed a two-tailed t-test at p = 0.04 for dof = 15) rate of MOI increase reaching similar to 10.1 x 10(27) kg m(2)/year, equivalent to a 10.91 mu s/year increase in the length of a day, during 2002-2017. Article in Journal/Newspaper Greenland Ice Sheet OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Climate Dynamics 58 9-10 2525 2538 |
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Open Polar |
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OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
language |
English |
description |
The widely used 15-year Gravity Recovery and Climate Experiment (GRACE) data sets do not conserve global total mass. They have a spurious decreasing trend of similar to 280 Gt/year. Various regions contribute differently to the global total mass loss error, with the Greenland Ice Sheet (GrIS) generating similar to 10% of the error alone. Atmospheric parameters from reanalysis datasets drive a well-tested ice model to generate mass variation time series over the GrIS for 2002-2015. Because shorter timescale spikes of similar to 10-30 Gt in GRACE measurements are physically based, only the overall trend of similar to 30 Gt/year requires correcting. A more accurate mass loss rate estimate for 2002-2015 is similar to 120 Gt/year, considerably below previous estimates. With the water redistribution to lower latitudes and other effects from a warming climate, the nontidal Earth moment of inertia (MOI) also increases. After rectification, the GRACE measured mass redistribution shows a steady, statistically robust (passed a two-tailed t-test at p = 0.04 for dof = 15) rate of MOI increase reaching similar to 10.1 x 10(27) kg m(2)/year, equivalent to a 10.91 mu s/year increase in the length of a day, during 2002-2017. |
author2 |
Ren, Diandong (author) Leslie, Lance M. (author) Huang, Ying (author) Hu, Aixue (author) |
format |
Article in Journal/Newspaper |
title |
Correction of GRACE measurements of the Earth's moment of inertia (MOI) |
spellingShingle |
Correction of GRACE measurements of the Earth's moment of inertia (MOI) |
title_short |
Correction of GRACE measurements of the Earth's moment of inertia (MOI) |
title_full |
Correction of GRACE measurements of the Earth's moment of inertia (MOI) |
title_fullStr |
Correction of GRACE measurements of the Earth's moment of inertia (MOI) |
title_full_unstemmed |
Correction of GRACE measurements of the Earth's moment of inertia (MOI) |
title_sort |
correction of grace measurements of the earth's moment of inertia (moi) |
publishDate |
2022 |
url |
https://doi.org/10.1007/s00382-021-06022-1 |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
Climate Dynamics--Clim Dyn--0930-7575--1432-0894 articles:25312 doi:10.1007/s00382-021-06022-1 ark:/85065/d71r6v5w |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1007/s00382-021-06022-1 |
container_title |
Climate Dynamics |
container_volume |
58 |
container_issue |
9-10 |
container_start_page |
2525 |
op_container_end_page |
2538 |
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1797583953508433920 |