Data · collection · 2021
Collaborative Research: Peripheral East Antarctic ice as a unique recorder of climate variability during the Last Interglacial
Listed in NASA Earthdata CMR
This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).
Description
The spatial extent of the West Antarctic Ice Sheet during the last interglacial period (129,000 to 116,000 years ago) is currently unknown, yet this information is fundamental to projections of the future stability of the ice sheet in a warming climate. Paleoclimate records and proxy evidence such as dust can inform on past environmental conditions and ice-sheet coverage.
This project will combine new, high-sensitivity geochemical measurements of dust from Antarctic ice collected at Allan Hills with existing water isotope records to document climate and environmental changes through the last interglacial period. These changes will then be compared with Earth-system model simulations of dust and water isotopes to determine past conditions and constrain the sensitivity of the West Antarctic Ice Sheet to warming.
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The project will test the hypothesis that the uncharacteristically volcanic dust composition observed at another peripheral ice core site at Taylor Glacier during the last interglacial period is related to changes in the spatial extent of the West Antarctic Ice Sheet. This project aims to characterize mineral dust transport during the penultimate glacial-interglacial transition. The team will apply high-precision geochemical techniques to the high-volume, high-resolution ice core drilled at the Allan Hills site in combination with Earth system model simulations to: (1) determine if the volcanic dust signature found in interglacial ice from Taylor Glacier is also found at Allan Hills, (2) determine the likely dust source(s) to this site during the last interglacial, and (3) probe the atmospheric and environmental changes during the last interglacial with a diminished West Antarctic Ice Sheet.
The team will develop a suite of measurements on previously drilled ice from Allan Hills, including isotopic compositions of Strontium and Neodymium, trace element concentrations, dust-size distribution, and imaging of ice-core dust to confirm the original signal observed and provide a broader spatial reconstruction of dust transport. In tandem, the team will conduct Earth system modeling with prognostic dust and water-isotope capability to test the sensitivity of dust transport under several plausible ice-sheet and freshwater-flux configurations.
By comparing dust reconstruction and model simulations, the team aims to elucidate the driving mechanisms behind dust transport during the last interglacial period. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
Links
Get the data
- usap-dc.org /view/dataset/601820 ↗
Strontium and neodymium isotope compositions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/601825 ↗
Concentration and flux of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area
download · from NASA CMR
- usap-dc.org /view/dataset/601821 ↗
Rare earth elemental concentrations of leached ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/601822 ↗
Oxygen and hydrogen isotope compositions and associated d-excess of ice from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/601748 ↗
Concentration and flux of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area
download · from NASA CMR
- usap-dc.org /view/dataset/601749 ↗
Strontium and neodymium isotope compositions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/602031 ↗
Strontium and neodymium isotope compositions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/602032 ↗
Rare earth elemental concentrations of leached and fully digested ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/602033 ↗
Oxygen and hydrogen isotope compositions and associated d-excess of ice from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/602034 ↗
Concentration and flux of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area
download · from NASA CMR
- usap-dc.org /view/dataset/602045 ↗
Grain size distributions of ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area
download · from NASA CMR
- usap-dc.org /view/dataset/601750 ↗
Rare earth elemental concentrations of leached ice core dust from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
- usap-dc.org /view/dataset/601751 ↗
Oxygen and hydrogen isotope compositions of ice from ALHIC1903 drilled at the Allan Hills Blue Ice Area.
download · from NASA CMR
Documentation and papers
- NSF Award Abstract nsf.gov/awardsearch/showAward.do?AwardNumber=2035637 ↗
documentation · from NASA CMR
- NSF Award Abstract nsf.gov/awardsearch/showAward.do?AwardNumber=2035580 ↗
documentation · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C2826441227-AMD_USAPDC.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C2826441227-AMD_USAPDC.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- FIELD SURVEYS · Geochemistry · Ice Core Records · Ice Extent · Paleoclimate Reconstructions
- Inferred from text
- Imaging 75% · Physical geography and environmental geoscience 73%
Provenance · 1 source records, 16 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C2826441227-AMD_USAPDC | 10 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:group:3709 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (73%) |
| concepts[measured_variable].gcmd:earth-science/climate-indicators/paleoclimate-indicators/ice-core-records | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/climate-indicators/paleoclimate-indicators/paleoclimate-reconstructions | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/cryosphere/snow-ice/ice-extent | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/geochemistry | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[platform].gcmd_platform:field-surveys | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| created_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| updated_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |