DOI: 10.1016/j.quascirev.2017.05.019
Scopus记录号: 2-s2.0-85020739407
论文题名: Deglaciation of the Eurasian ice sheet complex
作者: Patton H. ; Hubbard A. ; Andreassen K. ; Auriac A. ; Whitehouse P.L. ; Stroeven A.P. ; Shackleton C. ; Winsborrow M. ; Heyman J. ; Hall A.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 169 起始页码: 148
结束页码: 172
语种: 英语
英文关键词: Barents sea
; Deglaciation
; Eurasian ice sheet complex
; Fennoscandian ice sheet
; Fleuve Manche
; Glacio-isostatic adjustment
; Late Weichselian
; Proglacial hydrology
; Subglacial lakes
; Younger Dryas
Scopus关键词: Catchments
; Complex networks
; Geochronology
; Glacial geology
; Glaciers
; Lakes
; Sea level
; Barents sea
; Deglaciations
; Fleuve Manche
; Glacio-isostatic adjustment
; Ice sheet
; Late Weichselian
; Pro-glacial
; Subglacial lakes
; Younger Dryas
; Ice
; chronology
; climate forcing
; deglaciation
; glacial hydrology
; glacioisostasy
; ice cover
; ice retreat
; ice sheet
; Last Glacial Maximum
; model validation
; proglacial environment
; river system
; sea level change
; subglacial environment
; Weichselian
; Younger Dryas
; Arctic Ocean
; Barents Sea
; Elbe River
; Eurasia
; France
; Poland [Central Europe]
; Rhine River
; Scandes Mountains
; Seine Estuary
; Vistula River
英文摘要: The Eurasian ice sheet complex (EISC) was the third largest ice mass during the Last Glacial Maximum with a span of over 4500 km and responsible for around 20 m of eustatic sea-level lowering. Whilst recent terrestrial and marine empirical insights have improved understanding of the chronology, pattern and rates of retreat of this vast ice sheet, a concerted attempt to model the deglaciation of the EISC honouring these new constraints is conspicuously lacking. Here, we apply a first-order, thermomechanical ice sheet model, validated against a diverse suite of empirical data, to investigate the retreat of the EISC after 23 ka BP, directly extending the work of Patton et al. (2016) who modelled the build-up to its maximum extent. Retreat of the ice sheet complex was highly asynchronous, reflecting contrasting regional sensitivities to climate forcing, oceanic influence, and internal dynamics. Most rapid retreat was experienced across the Barents Sea sector after 17.8 ka BP when this marine-based ice sheet disintegrated at a rate of ∼670 gigatonnes per year (Gt a−1) through enhanced calving and interior dynamic thinning, driven by oceanic/atmospheric warming and exacerbated by eustatic sea-level rise. From 14.9 to 12.9 ka BP the EISC lost on average 750 Gt a−1, peaking at rates >3000 Gt a−1, roughly equally partitioned between surface melt and dynamic losses, and potentially contributing up to 2.5 m to global sea-level rise during Meltwater Pulse 1A. Independent glacio-isostatic modelling constrained by an extensive inventory of relative sea-level change corroborates our ice sheet loading history of the Barents Sea sector. Subglacial conditions were predominately temperate during deglaciation, with over 6000 subglacial lakes predicted along with an extensive subglacial drainage network. Moreover, the maximum EISC and its isostatic footprint had a profound impact on the proglacial hydrological network, forming the Fleuve Manche mega-catchment which had an area of ∼2.5 × 106 km2 and drained the present day Vistula, Elbe, Rhine and Thames rivers through the Seine Estuary. During the Bølling/Allerød oscillation after c. 14.6 ka BP, two major proglacial lakes formed in the Baltic and White seas, buffering meltwater pulses from eastern Fennoscandia through to the Younger Dryas when these massive proglacial freshwater lakes flooded into the North Atlantic Ocean. Deglaciation temporarily abated during the Younger Dryas stadial at 12.9 ka BP, when remnant ice across Svalbard, Franz Josef Land, Novaya Zemlya, Fennoscandia and Scotland experienced a short-lived but dynamic re-advance. The final stage of deglaciation converged on present day ice cover around the Scandes mountains and the Barents Sea by 8.7 ka BP, although the phase-lagged isostatic recovery still continues today. © 2017 The Authors 资助项目: The research is part of the Centre for Arctic Gas Hydrate, Environment and Climate (CAGE), and the GLANAM (GLAciated North Atlantic Margins) Initial Training Network. It was supported by the Research Council of Norway through its Centres of Excellence funding scheme (grant 223259), the PetroMaks project “Glaciations in the Barents Sea area (GlaciBar)” (grant 200672), the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013/ (REA grant agreement 317217), and a Stockholm Uni SUCLIM consortium grant (to Stroeven) that supported Hubbard in the early development of the model code. We thank two anonymous reviewers for their constructive feedback to improve the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59177
Appears in Collections: 过去全球变化的重建
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作者单位: CAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway; Department of Geography, Durham University, South Road, Durham, United Kingdom; Geomorphology and Glaciology, Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Sweden; Department of Earth Sciences, University of Gothenburg, Sweden
Recommended Citation:
Patton H.,Hubbard A.,Andreassen K.,et al. Deglaciation of the Eurasian ice sheet complex[J]. Quaternary Science Reviews,2017-01-01,169