Glacial Erosion/Sedimentation of the Baltic Region and the Effect on the Postglacial Uplift

Amantov, Aleksey; Fjeldskaar, Willy; Cathles, L. M.

doi:10.1007/978-3-642-17220-5_3

Cited by 21 publications

(24 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The time step is chosen to be the average of the time span given, rounded off to the nearest time step of the ice model. A value of 2300 kg m −3 is taken for sediment density, in agreement with Amantov et al (2011) and measurements for shallow sediments (Zaborska et al, 2008). The uncertainty in the density is likely smaller than the uncertainty in thickness and timing, which are represented here by the different sediment models.…”

Section: Model Inputs: Sediment Distributionmentioning

confidence: 80%

“…The model of Amantov et al (2011) couples ice sheet growth and erosion and is constrained by sedimentary and seismologic observations. The model accounts for enhanced erosion due to ice streams and the erodibility of various subice surfaces, among others.…”

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

“…Sediment removal and deposition is shown in Fig. 3.6 of Amantov et al (2011) in units of equivalent water thickness. Because part of the data is proprietary, the data for the time series and for creating the figure are not available.…”

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

“…B2). The original model of Amantov et al (2011) conserved mass, but in converting the graphics to a grid of sediment thickness values, mass conservation was lost. We opted not to enforce mass conservation, as doing so would require further assumptions which introduce uncertainty.…”

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

“…3.6 of Amantov et al (2011) appears to be saturated at 300 m, but in fact 300 m is the best guess by Amantov et al (2011) for maximum sediment deposition thickness, and it is set as maximum deposition in the modeling (Aleksey Amantov, personal communication, 2017). Finally, the large-scale failures for Sed1 from Table A5, which are not included in the model of Amantov et al (2011), are added from Table A2. Figure B1.…”

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

See 4 more Smart Citations

The effect of sediment loading in Fennoscandia and the Barents Sea during the last glacial cycle on glacial isostatic adjustment observations

Wal

IJpelaar²

2017

Solid Earth

View full text Add to dashboard Cite

Abstract. Models for glacial isostatic adjustment (GIA) routinely include the effects of meltwater redistribution and changes in topography and coastlines. Since the sediment transport related to the dynamics of ice sheets may be comparable to that of sea level rise in terms of surface pressure, the loading effect of sediment deposition could cause measurable ongoing viscous readjustment. Here, we study the loading effect of glacially induced sediment redistribution (GISR) related to the Weichselian ice sheet in Fennoscandia and the Barents Sea. The surface loading effect and its effect on the gravitational potential is modeled by including changes in sediment thickness in the sea level equation following the method of Dalca et al. (2013). Sediment displacement estimates are estimated in two different ways: (i) from a compilation of studies on local features (trough mouth fans, large-scale failures, and basin flux) and (ii) from output of a coupled ice-sediment model. To account for uncertainty in Earth's rheology, three viscosity profiles are used.It is found that sediment transport can lead to changes in relative sea level of up to 2 m in the last 6000 years and larger effects occurring earlier in the deglaciation. This magnitude is below the error level of most of the relative sea level data because those data are sparse and errors increase with length of time before present. The effect on present-day uplift rates reaches a few tenths of millimeters per year in large parts of Norway and Sweden, which is around the measurement error of long-term GNSS (global navigation satellite system) monitoring networks. The maximum effect on present-day gravity rates as measured by the GRACE (Gravity Recovery and Climate Experiment) satellite mission is up to tenths of microgal per year, which is larger than the measurement error but below other error sources. Since GISR causes systematic uplift in most of mainland Scandinavia, including GISR in GIA models would improve the interpretation of GNSS and GRACE observations there.

show abstract

Section: Model Inputs: Sediment Distributionmentioning

confidence: 80%

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

Section: B2 Creation Of a Spatial Pattern From Reported Sediment Dispmentioning

confidence: 99%

See 3 more Smart Citations

The effect of sediment loading in Fennoscandia and the Barents Sea during the last glacial cycle on glacial isostatic adjustment observations

Wal

IJpelaar²

2017

Solid Earth

View full text Add to dashboard Cite

show abstract

The Baltic Sea Basin

Rosentau

Bennike

Uścinowicz

et al. 2017

Submerged Landscapes of the European Continental Shelf

View full text Add to dashboard Cite

The interplay of bedrock fractures and glacial erosion in defining the present‐day land surface topography in mesoscopically isotropic crystalline rocks

Skyttä

Nordbäck

Ojala

et al. 2023

Earth Surf Processes Landf

View full text Add to dashboard Cite

This paper addresses the effect of fractures within crystalline bedrock on glacial erosion processes in fast flowing hard bed glacier environments. In particular, we examine (i) whether the fracture type is critical for the capability of a glacier to erode the bedrock through quarrying/plucking processes and (ii) whether we can recognize specific fracture‐controlled erosion signatures from bedrock surface morphologies. We conducted an investigation within the northern part of the Åland Islands, southern Finland, where the ice‐flow direction (N–S) has remained constant through Late Pleistocene glaciations and where the bedrock is characterized by a lack of any mesoscopic anisotropies (such as foliation) and hence provides an optimal target to recognize the relationships between fractures and erosional morphologies. We characterized the fracture systems within the bedrock using both UAV‐acquired orthophotographs and standard field approaches and extrapolated the results to larger scales using LiDAR‐based digital elevation models. Our findings indicate that individual joints or shear fractures are associated with the development of minor vertical breaks along the bedrock surface. However, they do not provide sufficient mechanical weakness zones in the bedrock to allow effective glacial quarrying, even though their lengths can be relatively large (>50 m). By contrast, the linkage of several parallel shear fractures or the presence of larger faults with gouge‐bearing cores and well‐developed damage zones leads to localized disintegration of the rock material and the subsequent development of distinct topographic depressions along the bedrock surface. Consequently, the results allow predictions to be made about the bedrock features underlying the observed topographic signatures along the bedrock surface. Applied to the area of this investigation, abrasion associated with N–S‐directed glacial flows is responsible for the N–S‐oriented elongate but smooth fjord‐like megagrooves, whereas the more abrupt topographic breaks were generated by quarrying controlled by sub‐vertical, E–W‐trending zones of localized brittle deformation.

show abstract

Glacial Erosion/Sedimentation of the Baltic Region and the Effect on the Postglacial Uplift

Cited by 21 publications

References 42 publications

The effect of sediment loading in Fennoscandia and the Barents Sea during the last glacial cycle on glacial isostatic adjustment observations

The effect of sediment loading in Fennoscandia and the Barents Sea during the last glacial cycle on glacial isostatic adjustment observations

The Baltic Sea Basin

The interplay of bedrock fractures and glacial erosion in defining the present‐day land surface topography in mesoscopically isotropic crystalline rocks

Contact Info

Product

Resources

About