为了更好地了解格陵兰冰的历史，研究人员分析了1993年在格陵兰顶峰3km以下的冰中收集的冰碛物。冰中含有植物碎片、木头、昆虫部分、真菌和宇宙成因核素，这表明峰顶的GrIS床是一个长期存在的、稳定的陆地表面，保存着沉积、暴露和间冰期生态系统的记录。
研究结果强调，了解格陵兰中部在更新世期间被冻土带覆盖，有助于了解北极生物圈对冰川消融的反应。
据悉，格陵兰冰盖(GrIS)在更新世期间的持久性和规模大小是不确定的。这一点很重要，因为重建GrIS的变化决定了它对之前温暖气候时期海平面上升的贡献，并为未来的预测提供信息。
附：英文原文
Title: Plant, insect, and fungi fossils under the center of Greenland’s ice sheet are evidence of ice-free times
Author: 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
Issue&Volume: 2024-8-5
Abstract: 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.
DOI: 10.1073/pnas.2407465121
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2407465121