Condensed Flashcards
Lambek, 1995
Main tool
Sea level change
Boulton and Hagdorn, 2006
Main tool
Thermo mechanical model by proxy climate data
Bradwell et al., 2009
Main tool
Sea-bed imagery
Hubbard et al., 2009
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Numerical modelling ice streams
Boulton et al., 2010
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Dynamics of ice streams of the biis particularly vale of york sediment analysis
Lambek, 1995
What this told
Sea level has risen due to the isostatic rebound from the glacial unloading of northern Britain and the meltwater loading of the adjacent seas.
Boulton and Hagdorn, 2006
What this told
Numerical ice sheet modelling and geological evidence to explore relationships between ice sheet form, ice streaming and marginal lobe formation.
Lobes reflect streaming of ice sheet.
Dynamic streams due to ice sheet properties
Fixed streams due to bed properties.
Bradwell et al., 2009
What this told
Allows for a viable pattern of ice-sheet disintegration.
Final-stage deglaciation was marked by near-shore ice streaming.
Retreat of the British Ice Sheet continued until 16 ka when, following the North Atlantic iceberg-discharge event (Heinrich-1).
Hubbard et al., 2009
What this told
Oxygen isotope curve reconstruction
BIIS very dynamic, drained mainly by recurrent ice streams which switch intensity over time in a series of binge/purge, cycles are identified which correspond to alternating periods of relatively cold-based ice and wet-based ice.
Separate ice centres of BIIS are dynamically interdependent in build up to maximum.
Boulton et al., 2010
What this told
Calculated discharge of 4 major subglaical rivers of the biis particularly vale of york and discovered that they had a high effective pressure and so moved in almost a buoyant state displaying a fast velocity.
Clark et al., 2012
What this told
Cosmogenic nuclide dating uses interactions between cosmic rays and nuclides in glacially eroded bedrock to provide age estimates to determine age maps of retreat in the UK between 27 and 15 ka BP.
Lambek, 1995
Bad bits
Discrepancies between observations and predictions
Boulton and Hagdorn, 2006
Bad bits
Spatial resolution fails to reconcile the temporal and spatial complexities
Hubbard et al., 2009
Phases of predominant streaming activity coincide with what?
periods of maximum ice extent and are triggered by abrupt transitions from a cold to relatively warm climate
Boulton et al., 2010
What did he applies his theories to suggest?
the BIIS was very unstable during the late devensian due to the response time of the pore water pressure changes in ice surface recharge. and this is one of the factors that led to fast ice sheet loss.
