Early Holocene shore-displacement in southern central Sweden as recorded in elevated isolated basins

Hedenström, Anna

doi:10.1080/030094899421993

Cited by 29 publications

(7 citation statements)

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“…In the Gulf of Bothnia area, in the northernmost part of the Baltic, this change was delayed by c. 500 years (Eronen 1974). A delay of the same duration has been found in studies of sea-level history in central Sweden (Hedenström & Risberg 1999).…”

Section: Mastogloia Phase and Litorina Sea Stagesupporting

confidence: 71%

Rates of Holocene isostatic uplift and relative sea-level lowering of the Baltic in SW Finland based on studies of isolation contacts

Eronen¹,

Glückert²,

Hatakka³

et al. 2001

Boreas

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Section: Mastogloia Phase and Litorina Sea Stagesupporting

confidence: 71%

Rates of Holocene isostatic uplift and relative sea-level lowering of the Baltic in SW Finland based on studies of isolation contacts

Eronen¹,

Glückert²,

Hatakka³

et al. 2001

Boreas

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“…), 4 m in Tallinn (Muru et al . ) and 1 m in Närke (Hedenström & Risberg )), the transgression can be estimated to about 11 m in Blekinge (Fig. ), which results in an Initial Littorina Sea Stage lowstand level of 4 m b.s.l.…”

Section: Resultsmentioning

confidence: 88%

A new early Holocene shoreline displacement record for Blekinge, southern Sweden, and implications for underwater archaeology

Hansson

Hammarlund

Landeschi

et al. 2018

Boreas

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We present evidence of a submerged early Holocene landscape off the Blekinge coastline in the Baltic Sea, dating to the Yoldia Sea and Initial Littorina Sea Stages when the water level was lower than at present. 14C dated wood remains obtained by surveillance diving and new archaeological findings in combination with bathymetric analyses and interpolations between other sites across the Baltic Sea were used for refinement of the shoreline displacement history of the region. The new results reveal a Yoldia Sea lowstand level at 20 m b.s.l., a subsequent Ancylus Lake highstand at 3 m a.s.l., and then a period of relatively stable water level at about 4 m b.s.l. during the Initial Littorina Sea Stage, several metres lower than previously concluded. The refined shoreline displacement record was used for palaeo‐reconstructions of the study area during four key periods, the Yoldia Sea lowstand phase, the Ancylus Lake transgression phase, the Ancylus Lake highstand phase and the Initial Littorina Sea lowstand phase, using elevation data and map algebra functions. A flow accumulation algorithm was used for reconstruction of the now submerged prehistoric river network in order to identify areas of high archaeological potential. Our revised shoreline displacement record, and especially its lowstand period during the Initial Littorina Sea Stage around 9500–8500 cal. a BP, raises future demands not only for specific archaeological shallow‐water surveys down to 4 m b.s.l. in the area, but also for a renewed cultural heritage management strategy. The results of this study fill an important gap in the early Holocene part of the shoreline displacement history of Blekinge, contributing to its completion since the deglaciation, which is unique for the Baltic Sea.

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“…), we use empirically derived relative sea level (RSL) reconstructions that span the operational length of the Bothnian Sea Ice Stream. Shoreline displacement data from sites in Norrbotten [ Lindén et al ., ], Ångermanland [ Berglund , ], Gästrikland [ Berglund , ], and Södertörn [ Hedenström and Risberg , ] were selected accordingly (Figure ). The published 14 C ages for the isolation of lake basins at each site were converted to calendar years B.P.…”

Section: Numerical Modelingmentioning

confidence: 99%

“…While the spatially nonlinear isostatic rebound in Scandinavia [cf. Hedenström and Risberg , ; Berglund , ] is accounted for in our RSL adjustment, there are uncertainties inherent in radiocarbon dating and calibration of samples used to infer RSL history, and further errors are likely introduced in interpolating between sites. Sensitivity testing to bed tilt was implemented by increasing the slope of our RSL‐adjusted bed topography by 10% and 20%.…”

Section: Numerical Modelingmentioning

confidence: 99%

Controls on the early Holocene collapse of the Bothnian Sea Ice Stream

et al. 2016

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New high‐resolution multibeam data in the Gulf of Bothnia reveal for the first time the subglacial environment of a Bothnian Sea Ice Stream. The geomorphological record suggests that increased meltwater production may have been important in driving rapid retreat of Bothnian Sea Ice during deglaciation. Here we apply a well‐established, one‐dimensional flow line model to simulate ice flow through the Gulf of Bothnia and investigate controls on retreat of the ice stream during the post‐Younger Dryas deglaciation of the Fennoscandian Ice Sheet. The relative influence of atmospheric and marine forcings are investigated, with the modeled ice stream exhibiting much greater sensitivity to surface melting, implemented through surface mass balance and hydrofracture‐induced calving, than to submarine melting or relative sea level change. Such sensitivity is supported by the presence of extensive meltwater features in the geomorphological record. The modeled ice stream does not demonstrate significant sensitivity to changes in prescribed ice stream width or overall bed slope, but local variations in basal topography and ice stream width result in nonlinear retreat of the grounding line, notably demonstrating points of short‐lived retreat slowdown on reverse bed slopes. Retreat of the ice stream was most likely governed by increased ice surface meltwater production, with the modeled retreat rate less sensitive to marine forcings despite the marine setting.

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Early Holocene shore-displacement in southern central Sweden as recorded in elevated isolated basins

Cited by 29 publications

References 0 publications

Rates of Holocene isostatic uplift and relative sea-level lowering of the Baltic in SW Finland based on studies of isolation contacts

Rates of Holocene isostatic uplift and relative sea-level lowering of the Baltic in SW Finland based on studies of isolation contacts

A new early Holocene shoreline displacement record for Blekinge, southern Sweden, and implications for underwater archaeology

Controls on the early Holocene collapse of the Bothnian Sea Ice Stream

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