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On the gravity and geoid effects of glacial isostatic adjustment in Fennoscandia: a short note
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Satellite Positioning.ORCID iD: 0000-0001-7810-8829
2015 (English)In: Journal of Geodetic Science, ISSN 2081-9919, E-ISSN 2081-9943, Vol. 5, 189-191 p.Article in journal (Refereed) Published
Abstract [en]

Many geoscientists argue that there is a gravity low of 10-30 mGal in Fennoscandia as a remaining fingerprint of the last ice age and load, both vanished about 10 kyr ago. However, the extraction of the gravity signal related with Glacial Isostatic Adjustment (GIA) is complicated by the fact that the total gravity field is caused by many significant density distributions in the Earth. Here we recall a methodology originating with A. Bjerhammar 35 years ago, that emphasizes that the present land uplift phenomenon mainly occurs in the region thatwas covered by the ice cap, and it is highly correlated with the spectral window of degrees 10-22 of the global gravity field, whose lower limit fairly well corresponds to the wavelength that agrees with the size of the region. This implies that, although in principle the GIA is a global phenomenon, the geoid and gravity lows as well as the land upheaval in Fennoscandia are typically regional phenomena that cannot be seen in a global correlation study as it is blurred by many irrelevant gravity signals. It is suggested that a regional multi-regression analysis with a band-limited spectral gravity signal as the observable, a method tested already 2 decades ago, can absorb possible significant disturbing signals, e.g. from topographic and crustal depth variations, and thereby recover the GIA signal.

Place, publisher, year, edition, pages
Walter de Gruyter, 2015. Vol. 5, 189-191 p.
Keyword [en]
Glacial Isostatic Adjustment, land uplift, postglacial rebound
National Category
Earth and Related Environmental Sciences
Research subject
Geodesy and Geoinformatics
Identifiers
URN: urn:nbn:se:kth:diva-205240DOI: 10.1515/jogs-2015-0019OAI: oai:DiVA.org:kth-205240DiVA: diva2:1088027
Note

QC 20170419

Available from: 2017-04-11 Created: 2017-04-11 Last updated: 2017-04-19Bibliographically approved

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Publisher's full texthttps://doi.org/10.1515/jogs-2015-0019

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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