ORCID Profile
0000-0002-9026-7571
Current Organisations
Australian National University
,
Durham University
,
University of Tasmania
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Publications
Future sea level change from Antarctica's Lambert-Amery glacial system
Publisher: American Geophysical Union (AGU)
Date: 28-07-2017
DOI: 10.1002/2017GL073486
Organization of ice flow by localized regions of elevated geothermal heat flux
Publisher: American Geophysical Union (AGU)
Date: 06-04-2016
DOI: 10.1002/2016GL068436
Sensitivity of the Lambert-Amery glacial system to geothermal heat flux
Publisher: International Glaciological Society
Date: 09-2016
DOI: 10.1017/AOG.2016.26
Abstract: Geothermal heat flux (GHF) is one of the key thermal boundary conditions for ice-sheet models. We assess the sensitivity of the Lambert-Amery glacial system in East Antarctica to four different GHF datasets using a regional ice-sheet model. A control solution of the regional model is initialised by minimising the misfit to observations through an optimisation process. The Lambert-Amery glacial system simulation contains temperate ice up to 150 m thick and has an average basal melt of 1.3 mm a −1 , with maximum basal melting of 504 mm a −1 . The simulations which use a relatively high GHF compared to the control solution increase the volume and area of temperate ice, which causes higher surface velocities at higher elevations, which leads to the advance of the grounding line. The grounding line advance leads to changes in the local flow configuration, which dominates the changes within the glacial system. To investigate the difference in spatial patterns within the geothermal datasets, they were scaled to have the same median value. These scaled GHF simulations showed that the ice flow was most sensitive to the spatial variation in the underlying GHF near the ice ides and on the edges of the ice streams.
An ensemble of Antarctic deglacial simulations constrained by geological observations
Publisher: Elsevier BV
Date: 12-2022
Velocities of the Amery Ice Shelf's primary tributary glaciers, 2004-12
Publisher: Cambridge University Press (CUP)
Date: 28-05-2015
DOI: 10.1017/S0954102015000231
Abstract: Monitoring the rate of ice flow into ice shelves is vital to understanding how, where and when mass changes occur in Antarctica. Previous observations of ice surface velocity indicate that the Amery Ice Shelf and tributary glaciers have been relatively stable over the period 1968 to 1999. This study measured the displacement of features on the ice surface over a sequence of Landsat 7 images separated by approximately one year and spanning 2004 to 2012 using the surface feature tracking software IMCORR. The focus is on the region surrounding the southern grounding zone of the Amery Ice Shelf and its primary tributary glaciers: the Fisher, Lambert and Mellor glaciers. No significant changes in surface velocity were observed over this period. Accordingly, the velocity fields from each image pair between 2004 and 2012 were used to synthesize an average velocity dataset of the Amery Ice Shelf region and to compare it to previously published velocity datasets and in situ global positioning system velocity observations. No significant change in ice surface velocities was found between 2004 and 2012 in the Amery Ice Shelf region, which suggests that it continues to remain stable.
Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages
Publisher: Elsevier BV
Date: 02-2019
Related Organisations
Durham University
Location: United Kingdom of Great Britain and Northern Ireland
Related Funding Activities
No related grants have been discovered for Mark Pittard.