Plant, insect, and fungi fossils under the center of Greenland's ice sheet are evidence of ice- free times

• 成果类型: Article
• 署名作者: Bierman, Paul R.; Mastro, Halley M.; Peteet, Dorothy M.; Corbett, Lee B.; Steig, Eric J.; Halsted, Chris T.; Caffee, Marc M.; Hidy, Alan J.; Balco, Greg; Bennike, Ole; Rock, Barry
• 署名单位: University of Vermont; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; Goddard Institute for Space Studies; Columbia University; University of Washington; University of Washington Seattle; Williams College; Purdue University System; Purdue University; United States Department of Energy (DOE); Lawrence Livermore National Laboratory; Geological Survey Of Denmark & Greenland; University System Of New Hampshire; University of New Hampshire
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-12326
• DOI: 10.1073/pnas.2407465121
• 发表日期: 2024-08-13
• 关键词: vegetation; gisp2

摘要

The persistence and size of the Greenland Ice Sheet (GrIS) through the Pleistocene is uncertain. This is important because reconstructing changes in the GrIS determines its contribution to sea level rise during prior warm climate periods and informs future projections. To understand better the history of Greenland's ice, we analyzed glacial till collected in 1993 from below 3 km of ice at Summit, Greenland. The till contains plant fragments, wood, insect parts, fungi, and cosmogenic nuclides showing that the bed of the GrIS at Summit is a long- lived, stable land surface preserving a record of deposition, exposure, and interglacial ecosystems. Knowing that central Greenland was tundra- covered during the Pleistocene informs the understanding of Arctic biosphere response to deglaciation.