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Publication:
Introducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica.

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cris.virtualsource.author-orcideb8ce2ef-396c-4a63-a6d7-ea80f6d6321a
dc.contributor.authorFerreira, Vagner G.
dc.contributor.authorYong, Bin
dc.contributor.authorSeitz, Kurt
dc.contributor.authorHeck, Bernhard
dc.contributor.authorGrombein, Thomas Maximilan
dc.date.accessioned2024-09-02T16:23:17Z
dc.date.available2024-09-02T16:23:17Z
dc.date.issued2020-09-30
dc.description.abstractIn the so-called point-mass modeling, surface densities are represented by point masses, providing only an approximated solution of the surface integral for the gravitational potential. Here, we propose a refinement for the point-mass modeling based on Taylor series expansion in which the zeroth-order approximation is equivalent to the point-mass solution. Simulations show that adding higher-order terms neglected in the point-mass modeling reduces the error of inverted mass changes of up to 90% on global and Antarctica scales. The method provides an alternative to the processing of the Level-2 data from the Gravity Recovery and Climate Experiment (GRACE) mission. While the evaluation of the surface densities based on improved point-mass modeling using ITSG-Grace2018 Level-2 data as observations reveals noise level of approximately 5.77 mm, this figure is 5.02, 6.05, and 5.81 mm for Center for Space Research (CSR), Goddard Space Flight Center (GSFC), and Jet Propulsion Laboratory (JPL) mascon solutions, respectively. Statistical tests demonstrate that the four solutions are not significant different (95% confidence) over Antarctica Ice Sheet (AIS), despite the slight differences seen in the noises. Therefore, the estimated noise level for the four solutions indicates the quality of GRACE mass changes over AIS. Overall, AIS shows a mass loss of −7.58 mm/year during 2003–2015 based on the improved point-mass solution, which agrees with the values derived from mascon solutions.
dc.description.numberOfPages22
dc.description.sponsorshipAstronomisches Institut der Universität Bern (AIUB)
dc.identifier.doi10.7892/boris.147684
dc.identifier.publisherDOI10.3390/rs12193197
dc.identifier.urihttps://boris-portal.unibe.ch/handle/20.500.12422/37760
dc.language.isoen
dc.publisherMDPI
dc.relation.ispartofRemote sensing
dc.relation.issn2072-4292
dc.relation.organizationDCD5A442BE96E17DE0405C82790C4DE2
dc.subject.ddc500 - Science::520 - Astronomy
dc.titleIntroducing an Improved GRACE Global Point-Mass Solution—A Case Study in Antarctica.
dc.typearticle
dspace.entity.typePublication
oaire.citation.issue19
oaire.citation.startPage3197
oaire.citation.volume12
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oairecerif.author.affiliationAstronomisches Institut der Universität Bern (AIUB)
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unibe.date.licenseChanged2020-11-17 13:32:34
unibe.description.ispublishedpub
unibe.eprints.legacyId147684
unibe.journal.abbrevTitleRemote Sensing
unibe.refereedTRUE
unibe.subtype.articlejournal

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