Correction of GRACE measurements of the Earth’s moment of inertia (MOI)

Ren, D; Leslie, LM; Huang, Y; Hu, A

Correction of GRACE measurements of the Earth’s moment of inertia (MOI)

Ren, D Leslie, LM Huang, Y Hu, A

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Publisher:: Springer
Publication Type:: Journal Article
Citation:: Climate Dynamics, 2022, 58, (9-10), pp. 2525-2538
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Ren, D
dc.contributor.author	Leslie, LM
dc.contributor.author	Huang, Y
dc.contributor.author	Hu, A
dc.date.accessioned	2023-02-15T02:46:02Z
dc.date.available	2023-02-15T02:46:02Z
dc.date.issued	2022-01-01
dc.identifier.citation	Climate Dynamics, 2022, 58, (9-10), pp. 2525-2538
dc.identifier.issn	0930-7575
dc.identifier.issn	1432-0894
dc.identifier.uri	http://hdl.handle.net/10453/166134
dc.description.abstract	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 ~ 280 Gt/year. Various regions contribute differently to the global total mass loss error, with the Greenland Ice Sheet (GrIS) generating ~ 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 ~ 10–30 Gt in GRACE measurements are physically based, only the overall trend of ~ 30 Gt/year requires correcting. A more accurate mass loss rate estimate for 2002–2015 is ~ 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 ~ 10.1 × 1027 kg m2/year, equivalent to a 10.91 μs/year increase in the length of a day, during 2002–2017.
dc.language	English
dc.publisher	Springer
dc.relation.ispartof	Climate Dynamics
dc.relation.isbasedon	10.1007/s00382-021-06022-1
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0401 Atmospheric Sciences, 0405 Oceanography, 0406 Physical Geography and Environmental Geoscience
dc.subject.classification	Meteorology & Atmospheric Sciences
dc.title	Correction of GRACE measurements of the Earth’s moment of inertia (MOI)
dc.type	Journal Article
utslib.citation.volume	58
utslib.for	0401 Atmospheric Sciences
utslib.for	0405 Oceanography
utslib.for	0406 Physical Geography and Environmental Geoscience
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2023-02-15T02:46:01Z
pubs.issue	9-10
pubs.publication-status	Published
pubs.volume	58
utslib.citation.issue	9-10

Abstract:

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 ~ 280 Gt/year. Various regions contribute differently to the global total mass loss error, with the Greenland Ice Sheet (GrIS) generating ~ 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 ~ 10–30 Gt in GRACE measurements are physically based, only the overall trend of ~ 30 Gt/year requires correcting. A more accurate mass loss rate estimate for 2002–2015 is ~ 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 ~ 10.1 × 1027 kg m2/year, equivalent to a 10.91 μs/year increase in the length of a day, during 2002–2017.

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http://hdl.handle.net/10453/166134