GRACE-Derived Linear and Non-linear Secular Mass Variations Over Greenland

Oliver Baur, Michael Kuhn, Will E. Featherstone

Research output: Chapter in Book/Conference paperConference paperpeer-review

2 Citations (Scopus)


In the past, GRACE (Gravity Recovery And Climate Experiment) monthly gravity field solutions have mainly been exploited to derive secular and seasonal mass changes on the Earth's surface. After seven years in operational mode, the satellite mission makes accelerated and decelerated mass variations detectable. Here we investigate the temporal characteristics of secular trends by fitting both linear and higher-order polynomials to the mass-change time-series. Our findings have been derived from GRACE gravity field time-series provided by CSR, GFZ and JPL. As a case study, we look at recent ice-mass variations over Greenland. Based on various model selection criteria (Akaike and Bayesian information criterion, cross-validation, hypotheses testing), our investigations show that linear regression is unable to describe recent deglaciation. Instead, the secular trend is best represented by a second-order polynomial, confirming accelerated deglaciation of the Greenland ice sheets, which increased by 250% between April 2002 and March 2009.

Original languageEnglish
Title of host publicationVII Hotine-Marussi Symposium on Mathematical Geodesy: Proceedings of the Symposium
EditorsNico Sneeuw, Pavel Novak, Mattia Crespi, Fernando Sanso
Place of PublicationCrete
Number of pages6
ISBN (Print)9783642220777
Publication statusPublished - 2012
Externally publishedYes
Event7th Hotine-Marussi Symposium on Mathematical Geodesy - Rome, Italy
Duration: 6 Jun 20096 Jun 2009
Conference number: 7

Publication series

NameInternational Association of Geodesy Symposia


Conference7th Hotine-Marussi Symposium on Mathematical Geodesy


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