Investigations of Fennoscandian glacial isostatic adjustment using modern sea level records
Abstract
We present a new method for determining the rates from a network of regional tide gauge data. The method involves using a model for the sea level observations (annual averages of relative sea level) that explicitly includes a term for the interannual sealevel variations, which are assumed to be constant for all sites in the network. The resulting simultaneous analysis of all the sea level observations yields sea level rates which are biased by the unknown temporal slope of the interannual variations. By differencing sea level rate estimates with respect to one site, “site‐referenced” sea level rates are calculated which are free from this bias. The differencing procedure also removes any signal due to a common sea level rate, such as might be associated with eustatic sea level rise. The resulting site‐referenced sea level rates therefore in principle reflect only the relative vertical crustal motions of the tide gauge sites with respect to the geoid. These site‐referenced sea level rates represent a potentially more accurate data set than have previously been used for sea level studies. We have used these rates to investigate glacial isostatic adjustment (GIA) in Fennoscandia. Specifically, we have used the site‐referenced sea level rates within the Baltic Sea to estimate adjustments to the ice history and Earth model which are used to calculate vertical rates of adjustment due to GIA, a method never before used for Fennoscandia. The parameters selected were lithospheric thickness, the viscosities of (assumed isoviscous) upper and lower mantles, and a Fennoscandian ice thickness scaling parameter. We present the results of this estimation procedure for a specific test ice model. We also find evidence that the sea level record for the site nearest the center of uplift, Furuögrund, may be contaminated by systematic errors of unknown origin. Data from this site have previously been used to determine a rate for the maximum uplift that we find is perhaps 1 mm yr−1, or ∼10%, too large.
Number of times cited: 26
- James L. Davis and Nadya T. Vinogradova, Causes of accelerating sea level on the East Coast of North America, Geophysical Research Letters, 44, 10, (5133-5141), (2017).
- Arjen P. Stroeven, Clas Hättestrand, Johan Kleman, Jakob Heyman, Derek Fabel, Ola Fredin, Bradley W. Goodfellow, Jonathan M. Harbor, John D. Jansen, Lars Olsen, Marc W. Caffee, David Fink, Jan Lundqvist, Gunhild C. Rosqvist, Bo Strömberg and Krister N. Jansson, Deglaciation of Fennoscandia, Quaternary Science Reviews, 10.1016/j.quascirev.2015.09.016, 147, (91-121), (2016).
- B. C. Root, W. Wal, P. Novák, J. Ebbing and L. L. A. Vermeersen, Glacial isostatic adjustment in the static gravity field of Fennoscandia, Journal of Geophysical Research: Solid Earth, 120, 1, (503-518), (2015).
- Lujia Feng, Emma M. Hill, Pedro Elósegui, Qiang Qiu, Iwan Hermawan, Paramesh Banerjee and Kerry Sieh, Hunt for slow slip events along the Sumatran subduction zone in a decade of continuous GPS data, Journal of Geophysical Research: Solid Earth, 120, 12, (8623-8632), (2015).
- C. Letetrel, M. Karpytchev, M-N. Bouin, M. Marcos, A. SantamarÍa-Gómez and G. Wöppelmann, Estimation of vertical land movement rates along the coasts of the Gulf of Mexico over the past decades, Continental Shelf Research, 10.1016/j.csr.2015.10.018, 111, (42-51), (2015).
- S.L. Bradley, M. Siddall, G.A. Milne, V. Masson-Delmotte and E. Wolff, Combining ice core records and ice sheet models to explore the evolution of the East Antarctic Ice sheet during the Last Interglacial period, Global and Planetary Change, 10.1016/j.gloplacha.2012.11.002, 100, (278-290), (2013).
- John M. Wahr and James L. Davis, Geodetic Constraints on Glacial Isostatic Adjustment, Ice Sheets, Sea Level and the Dynamic Earth, (3-32), (2013).
- Alar Rosentau, Jan Harff, Michael Meyer and Tõnis Oja, Postglacial rebound and relative sea level changes in the Baltic Sea since the Litorina transgression, Baltica, 10.5200/baltica.2012.25.11, 25, 2, (113-120), (2012).
- S.L. Bradley, M. Siddall, G.A. Milne, V. Masson-Delmotte and E. Wolff, Where might we find evidence of a Last Interglacial West Antarctic Ice Sheet collapse in Antarctic ice core records?, Global and Planetary Change, 10.1016/j.gloplacha.2012.03.004, 88-89, (64-75), (2012).
- Sarah L. Bradley, Glenn A. Milne, Ian Shennan and Robin Edwards, An improved glacial isostatic adjustment model for the British Isles, Journal of Quaternary Science, 26, 5, (541-552), (2011).
- Holger Steffen and Patrick Wu, Glacial isostatic adjustment in Fennoscandia—A review of data and modeling, Journal of Geodynamics, 10.1016/j.jog.2011.03.002, 52, 3-4, (169-204), (2011).
- G. Buble, R. A. Bennett and S. Hreinsdóttir, Tide gauge and GPS measurements of crustal motion and sea level rise along the eastern margin of Adria, Journal of Geophysical Research: Solid Earth, 115, B2, (2010).
- Emma M. Hill, James L. Davis, Mark E. Tamisiea and Martin Lidberg, Combination of geodetic observations and models for glacial isostatic adjustment fields in Fennoscandia, Journal of Geophysical Research: Solid Earth, 115, B7, (2010).
- S. L. Bradley, G. A. Milne, F. N. Teferle, R. M. Bingley and E. J. Orliac, Glacial isostatic adjustment of the British Isles: new constraints from GPS measurements of crustal motion, Geophysical Journal International, 178, 1, (14-22), (2009).
- L. HECHT, A. WITTEK, U. RILLER, T. MOHR, R. T. SCHMITT and R. A. F. GRIEVE, Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario, Meteoritics & Planetary Science, 43, 10, (1659-1679), (2010).
- Pippa Whitehouse, Konstantin Latychev, Glenn A. Milne, Jerry X. Mitrovica and Roblyn Kendall, Impact of 3‐D Earth structure on Fennoscandian glacial isostatic adjustment: Implications for space‐geodetic estimates of present‐day crustal deformations, Geophysical Research Letters, 33, 13, (2006).
- Zdeněk Martinec and Detlef Wolf, Inverting the Fennoscandian relaxation-time spectrum in terms of an axisymmetric viscosity distribution with a lithospheric root, Journal of Geodynamics, 10.1016/j.jog.2004.08.007, 39, 2, (143-163), (2005).
- Glenn A. Milne, Jerry X. Mitrovica, Hans‐Georg Scherneck, James L. Davis, Jan M. Johansson, Hannu Koivula and Martin Vermeer, Continuous GPS measurements of postglacial adjustment in Fennoscandia: 2. Modeling results, Journal of Geophysical Research: Solid Earth, 109, B2, (2004).
- Erik R. Ivins, Thomas S. James and Volker Klemann, Glacial isostatic stress shadowing by the Antarctic ice sheet, Journal of Geophysical Research: Solid Earth, 108, B12, (2003).
- Christopher F. Larsen, Keith A. Echelmeyer, Jeffrey T. Freymueller and Roman J. Motyka, Tide gauge records of uplift along the northern Pacific‐North American plate boundary, 1937 to 2001, Journal of Geophysical Research: Solid Earth, 108, B4, (2003).
- J. Mäkinen, H. Koivula, M. Poutanen and V. Saaranen, Vertical velocities in Finland from permanent GPS networks and from repeated precise levelling, Journal of Geodynamics, 10.1016/S0264-3707(03)00006-1, 35, 4-5, (443-456), (2003).
- Giovanni F. Sella, Timothy H. Dixon and Ailin Mao, REVEL: A model for Recent plate velocities from space geodesy, Journal of Geophysical Research: Solid Earth, 107, B4, (ETG 11-1-ETG 11-30), (2002).
- J. M. Johansson, J. L. Davis, H.‐G. Scherneck, G. A. Milne, M. Vermeer, J. X. Mitrovica, R. A. Bennett, B. Jonsson, G. Elgered, P. Elósegui, H. Koivula, M. Poutanen, B. O. Rönnäng and I. I. Shapiro, Continuous GPS measurements of postglacial adjustment in Fennoscandia 1. Geodetic results, Journal of Geophysical Research: Solid Earth, 107, B8, (ETG 3-1-ETG 3-27), (2002).
- John M. Wahr and James L. Davis, Geodetic constraints on glacial isostatic adjustment, Ice Sheets, Sea Level and the Dynamic Earth, 10.1029/GD029p0003, (3-32), (2002).
- Hans-Georg Scherneck, Jan M. Johansson, Martin Vermeer, James L. Davis, Glenn A. Milne and Jerry X. Mitrovica, BIFROST project: 3-D crustal deformation rates derived from GPS confirm postglacial rebound in Fennoscandia, Earth, Planets and Space, 10.1186/BF03352398, 53, 7, (703-708), (2014).
- Iain S. Stewart, Jeanne Sauber and James Rose, Glacio-seismotectonics: ice sheets, crustal deformation and seismicity, Quaternary Science Reviews, 10.1016/S0277-3791(00)00094-9, 19, 14-15, (1367-1389), (2000).




