2022 Arctic

Ice Core and Firn Aquifer Studies at Combatant Col, British Columbia, Canada

This project aims to recover an ice core at Combatant Col, BC, Canada to reconstruct hydroclimate variability over the last 500 years. Previous work at Combatant Col demonstrates preservation of annual stratigraphy, water-isotope and geochemical records reflecting important climate and environmental variables including atmospheric circulation, snow accumulation, fire activity, and trans-Pacific dust transport. Existing North Pacific ice cores are located exclusively in Alaska and the Yukon. Combatant Col significantly expands the spatial coverage of ice core records, while simultaneously providing a unique record of hydroclimate in southwestern British Columbia. This project will conduct detailed radar surveys and ice-flow modeling to better understand the glaciological setting and to select the optimal site for drilling. A core to bedrock will be retrieved using the Electrothermal Drill. Analysis of the ice core will include water isotope ratios and visual stratigraphy. In combination with high-resolution radar imaging, the core from Combatant Col will be used to determine whether the observed firn-aquifer at this site (liquid water is stored perennially above the firn-ice transition) has been a persistent feature at the site, or whether it has formed recently, and to determine its impact on glacier energy balance and dynamics. The core will be archived and made available for additional analyses by the ice core research community.

GreenDrill: The response of the northern Greenland Ice Sheet to Arctic Warmth - Direct constrains from sub-ice bedrock

The goal of this project is to gather new data to test the sensitivity of the northern Greenland Ice Sheet (GrIS) and its potential to contribute to sea level rise in the future. Specifically, data from the GreenDrill project will better constrain the response of the GrIS to past periods of warmth and address the hypothesis that the northern GrIS is more sensitive to Arctic warming than the southern GrIS. Using the Agile Sub-Ice Geological Drill and the Winkie Drill, the team will drill through the ice at sites in northern Greenland, sample bedrock obtained from those cores, and analyze a suite of cosmogenic nuclides (Beryllium-10, Aluminum-26, Chlorine-36, Carbon-14, and Neon-21) that can act as signatures of changes to the GrIS margin. These data will deliver direct observations of periods when the GrIS was substantially smaller than today and ice sheet margins retreated inland. Results will be incorporated into a numerical ice sheet model with a built-in cosmogenic nuclide module to identify plausible ice sheet histories. The modeling experiments will help understand the mechanisms and climate forcing underlying past periods of ice sheet retreat and help inform predictions of the future. Based on the melting scenarios, a first-order map of sea level rise fingerprints and inundation scenarios for major port cities will be produced.

Peru: Investigation of High Andean Snow and Ice Chemistry to Improve Paleoclimatic Reconstruction and Enhance Climate Prediction

This research examines past and modern change in climate over Peru and Bolivia using snow and ice samples to improve predictions for future climate. Instrumental records of climate and environmental variability from the region are sparse, yet ice cores from Central Andean glaciers provide a source of high-resolution records of past climate dynamics and chemistry of the atmosphere extending back centuries to millennia. Climate reconstructions from ice cores can provide added temporal and spatial context to existing multi-proxy climate reconstructions to help assess the impact of natural and human-induced physical and chemical climate change at the storm-scales that impact day to day and season to season events, and in the process, develop analogs for predicting future change. The goal of this research is to combine advances in ice core sampling technology, knowledge of Andean storm event meteorology, cyberinfrastructure, and climate modeling and analysis to fresh snow, snowpits and ice core data from Peru and Bolivia. Using the Thermal Drill, this project will recover approximately 140 meters of snow/firn/ice core from the summit region of Quelccaya during the project’s 2020 field season.