IEDA
Project Information
Collaborative Research: Paleohistory of the Larsen Ice Shelf System: Phase II
Description/Abstract
The Larsen Ice Shelf is the third largest ice shelf in Antarctica and has continued a pattern of catastrophic decay since the mid 1990's. The proposed marine geologic work at the Larsen Ice Shelf builds upon our previous NSF-OPP funding and intends to test the working hypothesis that the Larsen B Ice Shelf system has been a stable component of Antarctica's glacial system since it formed during rising sea levels 10,000 years BP. This conclusion, if supported by observations from our proposed work, is an important first step in establishing the uniqueness and consequences of rapid regional warming currently taking place across the Peninsula. Our previous work in the Larsen A and B embayments has allowed us to recognize the signature of past ice shelf fluctuations and their impact on the oceanographic and biologic environments. We have also overcome many of the limitations of standard radiocarbon dating in Antarctic marine sequences by using variations in the strength of the earth's magnetic field for correlation of sediment records and by using specific organic compounds (instead of bulk sediment) for radiocarbon dating. We intend to pursue these analytical advances and extend our sediment core stratigraphy to areas uncovered by the most recent collapse of the Larsen B Ice Shelf and areas immediately adjacent to the Larsen C Ice Shelf. In addition to the core recovery program, we intend to utilize our unique access to the ice shelf front to continue our observations of the snow/ice stratigraphy, oceanographic character, and ocean floor character. Sediment traps will also be deployed in order to measure the input of debris from glaciers that are now surging in response to the ice shelf collapse. This proposal is a multi-institutional, international (USAP, Italy, and Canada) effort that combines the established expertise in a variety of disciplines and integrates the research plan into the educational efforts of primarily undergraduate institutions but including some graduate education. This is a three-year project with field seasons planned with flexibility in order to accommodate schedules for the RVIB L.M. Gould. The Antarctic Peninsula is undergoing greater warming than almost anywhere on Earth, perhaps associated with human-induced greenhouse effects. Our proposed work contributes to understanding of these changes where they are occurring first and with greatest magnitude and impact upon the environment.
Personnel
Person Role
Ishman, Scott Investigator
Leventer, Amy Investigator
Domack, Eugene Walter Investigator
Funding
Unknown Program Award # 0338220
Unknown Program Award # 0338142
Antarctic Earth Sciences Award # 0338163
Deployment
Deployment Type
LMG0404 ship expedition
Data Management Plan
None in the Database
Datasets
Repository Title (link) Status
MGDS Expedition Data exist
USAP-DC NBP0603 - Paleohistory of the Larsen Ice Shelf System exist
MGDS NBP0603 - Expedition Data exist
MGDS Expedition data of LMG0404 exists
Publications
  1. Spaulding, N., Lucas, J., Huber, B., & Leventer, A. (2020). Ice retreat in the eastern Antarctic Peninsula region: the application of diatoms for understanding climate change. Marine Micropaleontology, 101896. (doi:10.1016/j.marmicro.2020.101896)