GB_NERC_BAS_PDC_01252
English
dataset
British Antarctic Survey
+44 (0)1223 221400
pdc@bas.ac.uk
pointOfContact
2019-11-08
NERC profile of ISO19115:2003
1.0
http://www.antarctica.ac.uk/dms/metadata.php?id=GB/NERC/BAS/PDC/01252
urn:ogc:def:crs:EPSG::4326
OGP
Simulations of the Early Holocene demise of the Laurentide Ice Sheet with BISICLES (public trunk r3298)
Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01252
2019-11-08
publication
GB/NERC/BAS/PDC/01252
http://www.antarctica.ac.uk/dms/metadata.php?id=
This dataset presents the input and output data from a set of sensitivity experiments to simulate the evolution of the Laurentide ice sheet in the Early Holocene (10-7 thousand years ago). These data are presented in the manuscript "Simulating the Early Holocene demise of the Laurentide Ice Sheet with BISICLES (public trunk revision 3298)". Simulating the demise of the Laurentide Ice Sheet covering the Hudson Bay in the early Holocene is important for understanding the role of accelerated changes in ice sheet topography and melt in the ''8.2 ka event'', a century long cooling of the Northern Hemisphere by several degrees. Freshwater released from the ice sheet through a surface mass balance instability (known as the saddle collapse) has been suggested as a major forcing for the 8.2 ka event, but the temporal evolution of this pulse has not been constrained. Dynamical ice loss and marine interactions could have significantly accelerated the ice sheet demise, but simulating such processes requires computationally expensive models that are difficult to configure and are often impractical for simulating past ice sheets. Here, we developed an ice sheet model setup for studying the Laurentide Ice Sheet''s Hudson Bay saddle collapse and the associated meltwater pulse in unprecedented detail using the BISICLES ice sheet model, an efficient marine ice sheet model of the latest generation, capable of refinement to kilometre-scale resolution and higher-order ice flow physics. The setup draws on previous efforts to model the deglaciation of the North American Ice Sheet for initialising the ice sheet temperature, recent ice sheet reconstructions for developing the topography of the region and ice sheet, and output from a general circulation model for a representation of the climatic forcing. The modelled deglaciation is in agreement with the reconstructed extent of the ice sheet and the associated meltwater pulse has realistic timing. Furthermore, the peak magnitude of the modelled meltwater equivalent (0.07-0.13 Sv) is compatible with geological estimates of freshwater discharge through the Hudson Strait. The results demonstrate that while improved representation of the glacial dynamics and marine interactions are key for correctly simulating the pattern of early Holocene ice sheet retreat, surface mass balance introduces by far the most uncertainty. The new model configuration presented here provides future opportunities to quantify the range of plausible amplitudes and durations of a Hudson Bay ice saddle collapse meltwater pulse and its role in forcing the 8.2 ka event.
Ilkka Matero was funded by the Leeds-York Natural Environment Research Council (NERC) Spheres Doctoral Training Partnership (NE/L002574/1). The contribution from Ruza Ivanovic was partly supported by NERC grant NE/K008536/1. Lauren Gregoire is funded by a UKRI Future Leaders Fellowship (MR/S016961/1). The work made use of the N8 HPC facilities, which are provided and funded by the N8 consortium and EPSRC (EP/K000225/1) and co-ordinated by the Universities of Leeds and Manchester.
British Antarctic Survey
+44 (0)1223 221400
High Cross, Madingley Road
Cambridge
CB3 0ET
UK
pdc@bas.ac.uk
custodian
Matero, I., Gregoire, L., & Ivanovic, R.
UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation
+44 (0)1223 221400
High Cross, Madingley
Cambridge
CB3 0ET
UK
pdc@bas.ac.uk
originator
unknown
NDGO0001
NERC_DDC
NERC OAI Harvesting
2019-11-08
revision
EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets
EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance
EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness
EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Ice Sheets
EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets
EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Mass Balance/Ice Sheet Mass Balance
EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness
EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glaciers
EARTH SCIENCE > Paleoclimate > Paleoclimate Reconstructions
GCMD Parameter Valids
2019-11-08
revision
8.2 ka event
BISICLES
Holocene
Laurentide
ice sheet
ice sheet model
BAS Free-text keywords
2019-11-08
revision
This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
otherRestrictions
This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
English
climatologyMeteorologyAtmosphere
environment
geoscientificInformation
-100
-53
40
75
unknown
unknown
Polar Data Centre - British Antarctic Survey
+44 (0)1223 221400
pdc@bas.ac.uk
distributor
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=7e0b2d81-ee71-48d6-a901-3b417d482072
download
dataset
Conformity_001
INSPIRE
INSPIRE Data Specification on unknown theme Guidelines
See the referenced specification
false
NetCDF files were produced by concatenating and filtering the raw output. This processing has not affected the accuracy of the data.