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Use of GRACE Data to Detect the Present Land Uplift Rate in Fennoscandia
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- Joud, Mehdi S. Shafiei (author)
- KTH,Geodesi och satellitpositionering,Geodesy
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- Sjöberg, Lars E. (author)
- KTH,Geodesi och satellitpositionering,Geodesy
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- Bagherbandi, Mohammad (author)
- KTH,Högskolan i Gävle,Samhällsbyggnad, GIS,1Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden,Geodesy,Geodesi och satellitpositionering,University of Gävle, Sweden
- (creator_code:org_t)
- 2017-02-17
- 2017
- English.
- In: Geophysical Journal International. - : Oxford University Press (OUP). - 0956-540X .- 1365-246X. ; 209:2, s. 909-922
- Journal article (peer-reviewed)
Abstract
Subject headings
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- After more than 13 years of GRACE monthly data, the determined secular trend of gravity field variation can be used to study the regions of glacial isostatic adjustment (GIA). Here we focus on Fennoscandia where long-term terrestrial and high-quality GPS data are available, and we study the monthly GRACE data from three analysis centres. We present a new approximate formula to convert the secular trend of the GRACE gravity change to the land uplift rate without making assumptions of the ice load history. The question is whether the GRACE-derived land uplift rate by our method is related to GIA. A suitable post-processing method for the GRACE data is selected based on weighted RMS differences with the GPS data. The study reveals that none of the assumed periodic changes of the GRACE gravity field is significant in the estimation of the secular trend, and they can, therefore, be neglected. Finally, the GRACE-derived land uplift rates are obtained using the selected post-processing method, and they are compared with GPS land uplift rate data. The GPS stations with significant differences were marked using a statistical significance test. The smallest RMS difference (1.0 mm/a) was obtained by using GRACE data from the University of Texas.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
Keyword
- aliasing periodic effect
- decorrelation
- glacial isostatic adjustment
- GRACE
- land uplift
- Innovative Learning
- Innovativt lärande
Publication and Content Type
- ref (subject category)
- art (subject category)
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