IEDA
Project Information
Collaborative Research: Record of the Triple-oxygen Isotope and Hydrogen Isotope Composition of Ice from an Ice Core at South Pole
Short Title:
South Pole Oxygen Isotopes
Start Date:
2015-06-15
End Date:
2019-05-31
Project Location(s)
South Pole
Program:
SPICEcore
Project Website(s)
Description/Abstract
This project will develop a record of the stable-isotope ratios of water from an ice core at the South Pole, Antarctica. Water-isotope ratio measurements provide a means to determine variability in temperature through time. South Pole is distinct from most other locations in Antarctica in showing no warming in recent decades, but little is known about temperature variability in this location prior to the installation of weather stations in 1957. The measurements made as part of this project will result in a much longer temperature record, extending at least 40,000 years, aiding our ability to understand what controls Antarctic climate, and improving projections of future Antarctic climate change. Data from this project will be critical to other investigators working on the South Pole ice core, and of general interest to other scientists and the public. Data will be provided rapidly to other investigators and made public as soon as possible.

This project will obtain records of the stable-isotope ratios of water on the ice core currently being obtained at South Pole. The core will reach a depth of 1500 m and an age of 40,000 years. The project will use laser spectroscopy to obtain both an ultra-high-resolution record of oxygen 18/16 and deuterium-hydrogen ratios, and a lower-resolution record of oxygen 17/16 ratios. The high-resolution measurements will be used to aid in dating the core, and to provide estimates of isotope diffusion that constrain the process of firn densification. The novel 17/16 measurement provides additional constraints on the isotope fractionation due to the temperature-dependent supersaturation ratio, which affects the fractionation of water during the liquid-solid condensate transition. Together, these techniques will allow for improved accuracy in the use of the water isotope ratios as proxies for ice-sheet temperature, sea-surface temperature, and atmospheric circulation. The result will be a record of decadal through centennial and millennial scale climate change in a climatically distinct region in East Antarctica that has not been previously sampled by deep ice coring. The project will support a graduate student who will be co-advised by faculty at the University of Washington and the University of Colorado, and will be involved in all aspects of the work.
Personnel
Person Role
Steig, Eric J. Investigator and contact
White, James Co-Investigator
Schauer, Andrew Technical Contact
Vaughn, Bruce Technical Contact
Funding
Antarctic Glaciology Award # 1443105
AMD - DIF Record(s)
Data Management Plan
None in the Database
Publications
  1. Kahle EC, Holme C, Jones TR, Gkinis V, and Steig EJ (2018) A Generalized Approach to Estimating Diffusion Length of Stable Water Isotopes from Ice-Core Data. Journal of Geophysical Research: Earth Surface, 123, 2377– 2391. (doi:10.1029/2018JF004764)
  2. Dütsch M, Blossey PN, Steig EJ, Nusbaumer JM, 2019, Non-equilibrium fractionation during ice cloud formation in iCAM5: evaluating the common parameterization of supersaturation as a linear function of temperature. Journal of Advances in Modeling Earth Systems. (doi:10.1029/2019MS001764)
  3. Kahle, E. C., Holme, C., Jones, T. R., Gkinis, V., & Steig, E. J. (2018). A Generalized Approach to Estimating Diffusion Length of Stable Water Isotopes From Ice-Core Data. Journal of Geophysical Research: Earth Surface, 123(10), 2377–2391. (doi:10.1029/2018jf004764)
  4. Winski, D. A., Fudge, T. J., Ferris, D. G., Osterberg, E. C., Fegyveresi, J. M., Cole-Dai, J., Thundercloud, Z., Cox, T. S., Kreutz, K. J., Ortman, N., Buizert, C., Epifanio, J., Brook, E. J., Beaudette, R., Severinghaus, J., Sowers, T., Steig, E. J., Kahle, E. C., Jones, T. R., Morris, V., Aydin, M., Nicewonger, M. R., Casey, K. A., Alley, R. B., Waddington, E. D., Iverson, N. A., Dunbar, N. W., Bay, R. C., Souney, J. M., Sigl, M., and McConnell, J. R. (2019) The SP19 chronology for the South Pole Ice Core – Part 1: volcanic matching and annual layer counting, Clim. Past, 15, 1793–1808 (doi:10.5194/cp-15-1793-2019)