USAP-DC

This award supports development of a new modeling approach that will extract information about past snow accumulation rate in both space and time in the vicinity of the future ice core near the Ross-Amundsen divide of the West Antarctic Ice Sheet (WAIS). Internal layers, detected by ice-penetrating radar, are isochrones, or former ice-sheet surfaces that have been buried by subsequent snowfall, and distorted by ice flow. Extensive ice-penetrating radar data are available over the inland portion of the WAIS. Layers have been dated back to 17,000 years before present. The radar data add the spatial dimension to the temporally resolved accumulation record from ice cores. Accumulation rates are traditionally derived from the depths of young, shallow layers, corrected for strain using a local 1-D ice-flow model. Older, deeper layers have been more affected by flow over large horizontal distances. However, it is these deeper layers that contain information on longer-term climate patterns. This project will use geophysical inverse theory and a 2.5D flow-band ice-flow forward model comprising ice-surface and layer-evolution modules, to extract robust transient accumulation patterns by assimilating multiple deeper, more-deformed layers that have previously been intractable. Histories of divide migration, geothermal flux, and surface evolution will also be produced. The grant will support the PhD research of a female graduate student who is a mentor to female socio-economically disadvantaged high-school students interested in science, through the University of Washington Women's Center. It will also provide a research
experience for an undergraduate student, and contribute to a freshman seminar on Scientific Research.

Person	Role
Koutnik, Michelle	Co-Investigator
Waddington, Edwin D.	Investigator

Antarctic Glaciology

Award # 0440666

Waddington_0440666
NSIDC-0473_1

None in the Database

Repository	Title (link)	Format(s)	Status
USAP-DC	Histories of Accumulation, Thickness, and WAIS Divide Location, Antarctica	None	exist

1. Cuffey, K.M., Clow, G.D., Steig, E.J., Buizert, C., Fudge, T.J., Koutnik, M., Waddington, E.D., Alley, R.A. and Severinghaus, J.P. 2016. Deglacial temperature history of West Antarctica, Proceedings of the National Academy of Sciences, 113(50), p. 14249-1425. doi: 10.1073/pnas.1609132113. (doi:10.1073/pnas.1609132113)
2. Koutnik, M. R., Fudge, T. J., Conway, H., Waddington, E. D., Neumann, T. A., Cuffey, K. M., … Taylor, K. C. (2016). Holocene accumulation and ice flow near the West Antarctic Ice Sheet Divide ice core site. Journal of Geophysical Research: Earth Surface, 121(5), 907–924. (doi:10.1002/2015jf003668)