Getting to the Bottom of Ice Shelves

Lead Research Organisation: University of Stirling
Department Name: Biological and Environmental Sciences

Abstract

The research methodology will be interdisciplinary and innovative, supervised by leading experts in their fields. The studentship will involve desktop analytical and experimental laboratory work collecting geological and geophysical data, and conducting detailed sedimentological and biogeochemical analyses. The project will use recently acquired highresolution bathymetric and geophysical data, seabed sediment cores and geochronological data - some of which has been previously collected by the supervisor team. The studentship will be based in Stirling but will also have access to world-class laboratory facilities at the University of Glasgow as well as other state-ofthe- art facilities if/when appropriate (e.g. BOSCORFNOC, SUERC/East Kilbride, etc).

The research methodology is designed to run in well-defined, but complementary, sequential phases: (i) sediment core analysis with emphasis on physical properties (grain size, X-ray CT, IRD counts, laminography) to understand sediment cyclicity and glaciological setting; (ii) geochemical analysis of sediment cores (XRF) to explore sediment flux provenance (terrestrial vs marine; biogenic vs icerafted layers); (iii) micropalaeontological and alkenone analysis to reconstruct palaeo sea-water temperatures, salinities and sea-ice extents. The successful candidate will receive dedicated training in each of the complementary techniques by the supervisory team, and she/he will be expected to contribute to the evolution and enhancement of the methodology throughout the project.

Publications

10 25 50

Studentship Projects

Project Reference Relationship Related To Start End Student Name
NE/S007431/1 01/10/2019 30/09/2028
2436927 Studentship NE/S007431/1 01/10/2020 31/03/2025 Neil McDonald
 
Description In this ongoing PhD project several significant findings have already been discovered:
1. A suite of new data has been collected during this project including new high resolution images of sediment cores (optical linescan, X-radoigraphs and X-ray computed laminographs), Itrax-XRF elemental composition data, sedimentological (sediment strength, and high resolution grain size analysis) microfossil assemblages for unique glaciomarine and marine sediments. These data will help refine our understanding of environmental changes in the Minch during the last glacial cycle.
2. A new method for characterising glaciomarine sediments has been developed using the freely available software FIJI/ImageJ. This method is able to measure the flux of icebergs in the past (from sediment X-ray images) at an unprecedented resolution by combining a new type of X-ray imaging technique - X-ray computed laminography with a new plugin which extracts greyscale values and their associated standard deviation at pixel resolution (<0.1 mm). This technique has the potential to refine our understanding of past climate changes and glacier dynamics. These results are now published (McDonald et al., 2022) and can be implemented by glacial scientists trying to understand past climate changes and glacier dynamic responses to climate or internal forcings.
Objectives met:
1. To capture new high-resolution data relating to sediment cores captured on Britice-Chrono James Cook cruise (JC123).
2. To explore the ingredients required to reconstruct past ice shelves the sediment and landform record.
Exploitation Route A new method for characterising glaciomarine sediments are now published (McDonald et al., 2022) and can be implemented by glacial scientists trying to understand past climate changes and glacier dynamic responses to climate or internal forcings.
Sectors Environment