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

Ferreira, Vagner G.; Yong, Bin; Seitz, Kurt; Heck, Bernhard; Grombein, Thomas

Abstract:
In 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. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129597
Veröffentlicht am 10.02.2021
Originalveröffentlichung
DOI: 10.3390/rs12193197
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2020
Sprache Englisch
Identifikator ISSN: 2072-4292
KITopen-ID: 1000129597
Erschienen in Remote sensing
Verlag MDPI
Band 12
Heft 19
Seiten Art.-Nr. 3197
Vorab online veröffentlicht am 30.09.2020
Schlagwörter GRACE; mascon; mass loss; point-mass modeling; regional inversion
Nachgewiesen in Dimensions
Scopus
Web of Science
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