USAP-DC

This award supports a project to reconstruct past ice-surface elevations from detailed glacial mapping and dating of moraines (using 14C dates of algae from former ice-marginal ponds and 10Be surface exposure ages) in the region of the Darwin-Hatherton Glaciers in Antarctica in order to try and resolve very different interpretations that currently exist about the glacial history in the region. The results will be integrated with existing climate and geophysical data into a flow-line model to gain insight into glacier response to climate and ice-dynamics perturbations during the Late Glacial Maximum (LGM) in Antarctica. The work will contribute to a better understanding of both LGM ice thickness and whether or not there is any evidence that Antarctica contributed to Meltwater Pulse (MWP)-1A a very controversial topic in Antarctic glacial geology. The intellectual merit of the work relates to the fact that reconstructing past fluctuations of the Antarctic Ice Sheet (AIS) is critical for understanding the sensitivity of ice volume to sea-level and climatic change. Constraints on past behavior help put ongoing changes into context and provide a basis for predicting future sea-level rise. Broader impacts include the support of two graduate and two undergraduate students, as well as a female early-career investigator. Graduate students will be involved in all stages of the project from planning and field mapping to geochronological analyses, interpretation, synthesis and reporting. Two undergraduates will work on lab-based research from the project. The project also will include visits to K-12 classrooms to talk about glaciers and climate change, correspondence with teachers and students from the field, and web-based outreach. This award has field work in Antarctica.

Person	Role
Hall, Brenda	Investigator and contact
Stone, John	Investigator and contact
Conway, Howard	Co-Investigator

Antarctic Glaciology	Award # 1246170
Antarctic Glaciology	Award # 1246110

USAP-1246170_1

Data_Management_Hatherton.pdf

Repository	Title (link)	Format(s)	Status
ICE-D	Darwin and Hatherton Glaciers	None	exist
USAP-DC	Hatherton Glacier Radiocarbon Data	None	exist

1. Hillebrand, T. R., Stone, J. O., Koutnik, M., King, C., Conway, H., Hall, B., … Gillespie, M. K. (2020). Holocene thinning and grounding-line retreat of Darwin and Hatherton Glaciers, Antarctica. (doi:10.5194/tc-2020-356)
2. Hillebrand, T. R., Stone, J. O., Koutnik, M., King, C., Conway, H., Hall, B., … Gillespie, M. K. (2021). Holocene thinning of Darwin and Hatherton glaciers, Antarctica, and implications for grounding-line retreat in the Ross Sea. The Cryosphere, 15(7), 3329–3354. (doi:10.5194/tc-15-3329-2021)