{"dp_type": "Dataset", "free_text": "Ice Core Dust"}
[{"awards": "2035580 Aarons, Sarah; 2019719 Brook, Edward", "bounds_geometry": ["POINT(159.31 -76.7)"], "date_created": "Wed, 29 Apr 2026 00:00:00 GMT", "description": "Previous analyses of dust concentration and size distribution in ice cores are limited to the past 800,000 years; however, the ALHIC1901 ice core drilled at the Allan Hills Blue Ice Area (BIA) in East Antarctica provides a unique opportunity to examine older discontinuous records of ice ranging in age from 4000-\u2013500 ka. Here we present a discrete record of insoluble particles within ALHIC1901 from the bottom 25 m of the core. We investigated the particle mass concentration, size distribution, and mineralogy within the core to assess the preservation of dust records in BIAs with complex flow histories. We find that the insoluble particle concentrations are likely altered by entrainment of basal sediment for depths 5 m above bedrock. For shallower depths less affected by subglacial input, the record lacks expected peaks in dust concentration during glacial periods, which have been termed \u201clong snapshots,\u201d implying that low net accumulation rates during glacial periods at the Allan Hills BIA results in the preferential loss or attenuation of glacial ice and a corresponding bias toward the preservation of interglacial ice. The dust concentrations may also be further smoothed due to ice thinning. A subset of particles from both the upper and lower ranges of depths analyzed shows evidence of mineral weathering and/or in situ production of secondary minerals, and insoluble particle concentration correlates well with non-atmospherically derived carbon dioxide concentrations. These results highlight the importance of identifying signs of basal ice-rock interactions and/or complicated accumulation and ablation histories as these affect our interpretation of paleoclimate records preserved in ice cores from BIAs.", "east": 159.31, "geometry": ["POINT(159.31 -76.7)"], "keywords": "Allan Hills; Antarctica; Basal Debris; Cryosphere; Dust; Ice Core; Ice Core Dust", "locations": "Allan Hills; Allan Hills; Antarctica", "north": -76.7, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Choi, Alissa; Carter, Austin; Marks-Peterson, Julia; Shackleton, Sarah; Higgins, John; Brook, Edward J.; Kirkpatrick, Liam; Chalif, Jacob; Aarons, Sarah", "project_titles": "Center for Oldest Ice Exploration; Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial", "projects": [{"proj_uid": "p0010321", "repository": "USAP-DC", "title": "Center for Oldest Ice Exploration"}, {"proj_uid": "p0010270", "repository": "USAP-DC", "title": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.7, "title": "Dust Record from Allan Hills Blue Ice: Towards Extending the Archive to 4000 ka", "uid": "602055", "west": 159.31}, {"awards": "2035580 Aarons, Sarah", "bounds_geometry": ["POINT(159.31 -76.7)"], "date_created": "Mon, 13 Apr 2026 00:00:00 GMT", "description": "This dataset contains count, volume, and mass distributions of dust particles from discrete samples of ice from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147\u2013119 ka).", "east": 159.31, "geometry": ["POINT(159.31 -76.7)"], "keywords": "ALHIC1903; Allan Hills; Antarctica; Blue Ice; Cryosphere; Dust; Grain Size; Particle Size", "locations": "Allan Hills; Antarctica", "north": -76.7, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Carter, Austin", "project_titles": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial", "projects": [{"proj_uid": "p0010270", "repository": "USAP-DC", "title": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.7, "title": "Grain size distributions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area", "uid": "602045", "west": 159.31}, {"awards": "2035580 Aarons, Sarah", "bounds_geometry": ["POINT(159.31 -76.7)"], "date_created": "Tue, 24 Mar 2026 00:00:00 GMT", "description": "This dataset contains dust mass concentrations, coarse particle fraction, interpolated accumulation rate, and dust flux from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147\u2013119 ka).", "east": 159.31, "geometry": ["POINT(159.31 -76.7)"], "keywords": "Accumulation Rate; ALHIC1903; Allan Hills; Antarctica; Blue Ice; Concentration; Cryosphere; Dust; Flux", "locations": "Antarctica; Allan Hills", "north": -76.7, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Carter, Austin", "project_titles": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial", "projects": [{"proj_uid": "p0010270", "repository": "USAP-DC", "title": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.7, "title": "Concentration and flux of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area", "uid": "602034", "west": 159.31}, {"awards": "2035580 Aarons, Sarah", "bounds_geometry": ["POINT(159.31 -76.7)"], "date_created": "Tue, 24 Mar 2026 00:00:00 GMT", "description": "This dataset contains Sr and Nd isotope compositions of ice core dust from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147\u2013119 ka).", "east": 159.31, "geometry": ["POINT(159.31 -76.7)"], "keywords": "ALHIC1903; Allan Hills; Antarctica; Cryosphere; Dust; Ice Core Data; Isotope; Nd; Neodymium; Sr; Strontium", "locations": "Allan Hills; Antarctica", "north": -76.7, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Carter, Austin", "project_titles": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial", "projects": [{"proj_uid": "p0010270", "repository": "USAP-DC", "title": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -76.7, "title": "Strontium and neodymium isotope compositions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.", "uid": "602031", "west": 159.31}, {"awards": "2035580 Aarons, Sarah", "bounds_geometry": ["POINT(159.31 -76.7)"], "date_created": "Tue, 24 Mar 2026 00:00:00 GMT", "description": "This dataset contains rare earth elemental concentrations of leached ice core dust from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147\u2013119 ka).", "east": 159.31, "geometry": ["POINT(159.31 -76.7)"], "keywords": "ALHIC1903; Allan Hills; Antarctica; Blue Ice; Cryosphere; Dust; Leach; Rare Earth Element", "locations": "Allan Hills; Antarctica", "north": -76.7, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Carter, Austin", "project_titles": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial", "projects": [{"proj_uid": "p0010270", "repository": "USAP-DC", "title": "Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Allan Hills", "south": -76.7, "title": "Rare earth elemental concentrations of leached and fully digested ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.", "uid": "602032", "west": 159.31}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
Dust Record from Allan Hills Blue Ice: Towards Extending the Archive to 4000 ka
|
2035580 2019719 |
2026-04-29 | Choi, Alissa; Carter, Austin; Marks-Peterson, Julia; Shackleton, Sarah; Higgins, John; Brook, Edward J.; Kirkpatrick, Liam; Chalif, Jacob; Aarons, Sarah |
Center for Oldest Ice Exploration Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial |
Previous analyses of dust concentration and size distribution in ice cores are limited to the past 800,000 years; however, the ALHIC1901 ice core drilled at the Allan Hills Blue Ice Area (BIA) in East Antarctica provides a unique opportunity to examine older discontinuous records of ice ranging in age from 4000-–500 ka. Here we present a discrete record of insoluble particles within ALHIC1901 from the bottom 25 m of the core. We investigated the particle mass concentration, size distribution, and mineralogy within the core to assess the preservation of dust records in BIAs with complex flow histories. We find that the insoluble particle concentrations are likely altered by entrainment of basal sediment for depths 5 m above bedrock. For shallower depths less affected by subglacial input, the record lacks expected peaks in dust concentration during glacial periods, which have been termed “long snapshots,” implying that low net accumulation rates during glacial periods at the Allan Hills BIA results in the preferential loss or attenuation of glacial ice and a corresponding bias toward the preservation of interglacial ice. The dust concentrations may also be further smoothed due to ice thinning. A subset of particles from both the upper and lower ranges of depths analyzed shows evidence of mineral weathering and/or in situ production of secondary minerals, and insoluble particle concentration correlates well with non-atmospherically derived carbon dioxide concentrations. These results highlight the importance of identifying signs of basal ice-rock interactions and/or complicated accumulation and ablation histories as these affect our interpretation of paleoclimate records preserved in ice cores from BIAs. | ["POINT(159.31 -76.7)"] | ["POINT(159.31 -76.7)"] | false | false |
|
Grain size distributions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area
|
2035580 |
2026-04-13 | Carter, Austin |
Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial |
This dataset contains count, volume, and mass distributions of dust particles from discrete samples of ice from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147–119 ka). | ["POINT(159.31 -76.7)"] | ["POINT(159.31 -76.7)"] | false | false |
|
Concentration and flux of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area
|
2035580 |
2026-03-24 | Carter, Austin |
Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial |
This dataset contains dust mass concentrations, coarse particle fraction, interpolated accumulation rate, and dust flux from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147–119 ka). | ["POINT(159.31 -76.7)"] | ["POINT(159.31 -76.7)"] | false | false |
|
Strontium and neodymium isotope compositions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
|
2035580 |
2026-03-24 | Carter, Austin |
Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial |
This dataset contains Sr and Nd isotope compositions of ice core dust from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147–119 ka). | ["POINT(159.31 -76.7)"] | ["POINT(159.31 -76.7)"] | false | false |
|
Rare earth elemental concentrations of leached and fully digested ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
|
2035580 |
2026-03-24 | Carter, Austin |
Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial |
This dataset contains rare earth elemental concentrations of leached ice core dust from ALHIC1903 spanning the transition from MIS 6 through 5e (approximately 147–119 ka). | ["POINT(159.31 -76.7)"] | ["POINT(159.31 -76.7)"] | false | false |
