View in EDS

Miocene and Pliocene ice and air from the Allan Hills blue ice area, East Antarctica.

Saved in:
Bibliographic Details
Title: Miocene and Pliocene ice and air from the Allan Hills blue ice area, East Antarctica.
Authors: Shackleton, S.1,2 sarah.shackleton@whoi.edu, Hishamunda, V.1, Davidge, L.3, Brook, E.4, Peterson, J. Marks4, Carter, A.5, Aarons, S.5, Kurbatov, A.6, Introne, D.6, Yan, Y.7, Nesbitt, M.6, Buizert, C.4, Steig, E. J.3, Schauer, A. J.3, Morgan, J.5, Neff, P. D.8, Epifanio, J. A.4, Severinghaus, J.5, Bender, M.1,9, Higgins, J. A.1 jahiggin@princeton.edu
Source: Proceedings of the National Academy of Sciences of the United States of America. 11/4/2025, Vol. 122 Issue 44, p1-6. 17p.
Subjects: Antarctic ice, Ice cores, Miocene Epoch, Stable isotopes, Paleoclimatology, Glaciers, Antarctic climate, Pliocene Epoch
Geographic Terms: Antarctica, East Antarctica (Antarctica)
Abstract: Antarctic ice cores provide a unique archive of Earth’s atmosphere and its largest extant ice sheet. The oldest continuous ice core extends back 800 ky, though discontinuous ice cores from the Allan Hills blue ice area (BIA) have been shown to preserve snapshots of ice and air back to at least 2.7 million years ago (Ma). Here, we provide snapshots of putatively Miocene and Pliocene ice and air from shallow ice cores drilled in the Allan Hills BIA. The ice, dated using the deficit in 40Ar in ancient air compared to the modern atmosphere, is stratigraphically complex. Nevertheless, surface temperatures inferred from water isotopes correlate with sample age and indicate 12 ± 2 °C of cooling in Antarctica between 6 Ma and the late Pleistocene. Basal ice is nearly devoid of gases and remains to be dated with existing methods. This undated ice is characterized by an isotopic temperature 5 ± 1 °C warmer than the oldest dated (6 million year old) sample. We speculate that this ice reflects surface snowpack or permafrost that was preserved by the growth of the East Antarctic ice sheet in the Middle to Late Miocene. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 191505982
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Miocene and Pliocene ice and air from the Allan Hills blue ice area, East Antarctica.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Shackleton%2C+S%2E%22">Shackleton, S.</searchLink><relatesTo>1,2</relatesTo><i> sarah.shackleton@whoi.edu</i><br /><searchLink fieldCode="AR" term="%22Hishamunda%2C+V%2E%22">Hishamunda, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Davidge%2C+L%2E%22">Davidge, L.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Brook%2C+E%2E%22">Brook, E.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Peterson%2C+J%2E+Marks%22">Peterson, J. Marks</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Carter%2C+A%2E%22">Carter, A.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Aarons%2C+S%2E%22">Aarons, S.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Kurbatov%2C+A%2E%22">Kurbatov, A.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Introne%2C+D%2E%22">Introne, D.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Yan%2C+Y%2E%22">Yan, Y.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Nesbitt%2C+M%2E%22">Nesbitt, M.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Buizert%2C+C%2E%22">Buizert, C.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Steig%2C+E%2E+J%2E%22">Steig, E. J.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Schauer%2C+A%2E+J%2E%22">Schauer, A. J.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Morgan%2C+J%2E%22">Morgan, J.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Neff%2C+P%2E+D%2E%22">Neff, P. D.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Epifanio%2C+J%2E+A%2E%22">Epifanio, J. A.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Severinghaus%2C+J%2E%22">Severinghaus, J.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Bender%2C+M%2E%22">Bender, M.</searchLink><relatesTo>1,9</relatesTo><br /><searchLink fieldCode="AR" term="%22Higgins%2C+J%2E+A%2E%22">Higgins, J. A.</searchLink><relatesTo>1</relatesTo><i> jahiggin@princeton.edu</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America%22">Proceedings of the National Academy of Sciences of the United States of America</searchLink>. 11/4/2025, Vol. 122 Issue 44, p1-6. 17p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Antarctic+ice%22">Antarctic ice</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+cores%22">Ice cores</searchLink><br /><searchLink fieldCode="DE" term="%22Miocene+Epoch%22">Miocene Epoch</searchLink><br /><searchLink fieldCode="DE" term="%22Stable+isotopes%22">Stable isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Paleoclimatology%22">Paleoclimatology</searchLink><br /><searchLink fieldCode="DE" term="%22Glaciers%22">Glaciers</searchLink><br /><searchLink fieldCode="DE" term="%22Antarctic+climate%22">Antarctic climate</searchLink><br /><searchLink fieldCode="DE" term="%22Pliocene+Epoch%22">Pliocene Epoch</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Antarctica%22">Antarctica</searchLink><br /><searchLink fieldCode="DE" term="%22East+Antarctica+%28Antarctica%29%22">East Antarctica (Antarctica)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Antarctic ice cores provide a unique archive of Earth’s atmosphere and its largest extant ice sheet. The oldest continuous ice core extends back 800 ky, though discontinuous ice cores from the Allan Hills blue ice area (BIA) have been shown to preserve snapshots of ice and air back to at least 2.7 million years ago (Ma). Here, we provide snapshots of putatively Miocene and Pliocene ice and air from shallow ice cores drilled in the Allan Hills BIA. The ice, dated using the deficit in 40Ar in ancient air compared to the modern atmosphere, is stratigraphically complex. Nevertheless, surface temperatures inferred from water isotopes correlate with sample age and indicate 12 ± 2 °C of cooling in Antarctica between 6 Ma and the late Pleistocene. Basal ice is nearly devoid of gases and remains to be dated with existing methods. This undated ice is characterized by an isotopic temperature 5 ± 1 °C warmer than the oldest dated (6 million year old) sample. We speculate that this ice reflects surface snowpack or permafrost that was preserved by the growth of the East Antarctic ice sheet in the Middle to Late Miocene. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=191505982
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1073/pnas.2502681122
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 1
    Subjects:
      – SubjectFull: Antarctic ice
        Type: general
      – SubjectFull: Ice cores
        Type: general
      – SubjectFull: Miocene Epoch
        Type: general
      – SubjectFull: Stable isotopes
        Type: general
      – SubjectFull: Paleoclimatology
        Type: general
      – SubjectFull: Glaciers
        Type: general
      – SubjectFull: Antarctic climate
        Type: general
      – SubjectFull: Pliocene Epoch
        Type: general
      – SubjectFull: Antarctica
        Type: general
      – SubjectFull: East Antarctica (Antarctica)
        Type: general
    Titles:
      – TitleFull: Miocene and Pliocene ice and air from the Allan Hills blue ice area, East Antarctica.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Shackleton, S.
      – PersonEntity:
          Name:
            NameFull: Hishamunda, V.
      – PersonEntity:
          Name:
            NameFull: Davidge, L.
      – PersonEntity:
          Name:
            NameFull: Brook, E.
      – PersonEntity:
          Name:
            NameFull: Peterson, J. Marks
      – PersonEntity:
          Name:
            NameFull: Carter, A.
      – PersonEntity:
          Name:
            NameFull: Aarons, S.
      – PersonEntity:
          Name:
            NameFull: Kurbatov, A.
      – PersonEntity:
          Name:
            NameFull: Introne, D.
      – PersonEntity:
          Name:
            NameFull: Yan, Y.
      – PersonEntity:
          Name:
            NameFull: Nesbitt, M.
      – PersonEntity:
          Name:
            NameFull: Buizert, C.
      – PersonEntity:
          Name:
            NameFull: Steig, E. J.
      – PersonEntity:
          Name:
            NameFull: Schauer, A. J.
      – PersonEntity:
          Name:
            NameFull: Morgan, J.
      – PersonEntity:
          Name:
            NameFull: Neff, P. D.
      – PersonEntity:
          Name:
            NameFull: Epifanio, J. A.
      – PersonEntity:
          Name:
            NameFull: Severinghaus, J.
      – PersonEntity:
          Name:
            NameFull: Bender, M.
      – PersonEntity:
          Name:
            NameFull: Higgins, J. A.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 04
              M: 11
              Text: 11/4/2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 00278424
          Numbering:
            – Type: volume
              Value: 122
            – Type: issue
              Value: 44
          Titles:
            – TitleFull: Proceedings of the National Academy of Sciences of the United States of America
              Type: main
ResultId 1