Table · collection · 2018
Collaborative Research: Window into the World with 40,000-year Glacial Cycles from Climate Records in Million Year-old Ice from the Allan Hills Blue Ice Area
Listed in NASA Earthdata CMR
This project developed the paleoclimate record from the Allan Hills blue ice area.
Description
Between about 2.8-0.9 million years ago, Earth's climate was characterized by 40,000-year cycles, driven or paced by changes in the tilt of Earth's spin axis. Much is known about the "40,000-year" world from studies of deep-sea sediments, but our understanding of climate change during this period is incomplete because we lack records of Antarctic climate and direct records of atmospheric greenhouse gas concentrations.
We recovered ice extending, discontinuously, from 0.1-2 million years old. Ice was dated by measuring the 40Ar/38Ar (Argon) ratio of the trapped gases. Our discovery of old ice demonstrates that there is gas-record-quality ice from the 40,000-year world in the Allan Hills Main Ice Field.
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We have drilled two different sites, each overlying bedrock at ~ 200 m depth. We characterized the continuity of our cores by measuring the deuterium and oxygen isotope ratios in the ice to inform on the temperature and moisture source changes of the Allan Hills region to advance understanding of climate dynamics during these periods.
Links
Get the data
- usap-dc.org /view/dataset/601130 ↗
Stable water isotope data for the surface samples collected at the Allan Hills Blue ice area
download · from NASA CMR
- usap-dc.org /view/dataset/601204 ↗
Elemental and isotopic composition of nitrogen, oxygen, and argon in Allan Hills ice cores
download · from NASA CMR
- usap-dc.org /view/dataset/601202 ↗
Carbon dioxide concentration and its stable carbon isotope composition in Allan Hills ice cores
download · from NASA CMR
- usap-dc.org /view/dataset/601424 ↗
Stable isotope composition of the trapped air in the Allan Hills S27 ice core URL Content Type: Distribution URL
download · from NASA CMR
- usap-dc.org /view/dataset/601201 ↗
Elemental and isotopic composition of heavy noble gases in Allan Hills ice cores
download · from NASA CMR
- usap-dc.org /view/dataset/601425 ↗
Greenhouse gas composition in the Allan Hills S27 ice core
download · from NASA CMR
- usap-dc.org /view/dataset/601128 ↗
Stable water isotope data for the AH-1503 ice core drilled at the Allan Hills Blue ice area
download · from NASA CMR
- Methane concentration in Allan Hills ice cores usap-dc.org/view/dataset/601203 ↗
download · from NASA CMR
- usap-dc.org /view/dataset/601483 ↗
Elemental and isotopic composition of nitrogen, oxygen, and argon in Allan Hills ice cores v2
download · from NASA CMR
- usap-dc.org /view/dataset/601512 ↗
Stable isotope composition of the trapped air in the Allan Hills S27 ice core v2
download · from NASA CMR
- usap-dc.org /view/dataset/601129 ↗
Stable water isotope data for the AH-1502 ice core drilled at the Allan Hills Blue ice area
download · from NASA CMR
Documentation and papers
- NSF Award Abstract nsf.gov/awardsearch/showAward.do?AwardNumber=1443306 ↗
documentation · from NASA CMR
- NSF Award Information nsf.gov/awardsearch/showAward.do?AwardNumber=1443263 ↗
documentation · from NASA CMR
- Project page usap-dc.org/view/project/p0000760 ↗
project · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C2532074234-AMD_USAPDC.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C2532074234-AMD_USAPDC.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- CORING DEVICES · FIELD INVESTIGATION · Glaciers Ice Sheets · Ice Core Records · LABORATORY
Provenance · 1 source records, 14 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C2532074234-AMD_USAPDC | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:coring-devices | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/cryosphere/glaciers-ice-sheets | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/paleoclimate/ice-core-records | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:field-investigation | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:laboratory | 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 |