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CO2 and CH4 from Allan Hills ice cores ALHIC1901, 1902, and 1903 Data DOI: https://doi.org/10.15784/601896 Cite as Higgins, J. (2025) "CO2 and CH4 from Allan Hills ice cores ALHIC1901, 1902, and 1903" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601896. Abstract Between about 2.8-0.9 Ma, Earth’s climate was characterized by 40 kyr cycles, driven or paced by changes in the tilt of Earth’s spin axis. Much is known about the 40k world from studies of deep-sea sediments, but our understanding of climate change during this period and the transition between the 40kyr glacial cycles from 2.8-0.9 Ma and the 100kyr glacial cycles of the last 0.9 Myr is incomplete because we lack records of Antarctic climate and direct records of atmospheric greenhouse gas concentrations. We propose to address these issues by building on our recent studies of >1 Ma ice discovered in shallow ice cores in the Allan Hills Blue Ice Area (BIA), Antarctica. During the 2015-2016 field season we recovered ice from two nearby drill cores that dates to > 2 million years in age using the 40Ar/38Ar ratio of the trapped gases. Our discovery of ice of this antiquity in two cores demonstrates that there is gas-record quality ice from the 40k world in the Allan Hills BIA. To further characterize the composition of Earth’s atmosphere and Antarctic climate during the 40k world we request support for two field seasons to drill new large-volume (4” or 9” diameter) ice cores at sites where we have previously identified >1 Ma ice and nearby sites where ground penetrating radar has identified bedrock features conducive to the preservation of old ice. Creator(s): Higgins, John Date Created: 2025-02-12 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: 159.3562, East: 159.3562, South: -76.73243, North: -76.73243 Award(s) NSF 1744993 Version: 1 Related Project(s) Collaborative research: Snapshots of Early and Mid-Pleistocene Climate and Atmospheric Composition from the Allan Hills Blue Ice Area Center for Oldest Ice Exploration Keywords Allan Hills Antarctica Ch4 CO2 Cryosphere Glaciology Ice Core Data