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Simulated atmospheric seasonal responses of the southern annular mode to the Antarctic sea ice dipole in austral spring and summer.

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Title: Simulated atmospheric seasonal responses of the southern annular mode to the Antarctic sea ice dipole in austral spring and summer.
Authors: Cai, Hui1,2 (AUTHOR), Li, Shuanglin1,3 (AUTHOR) Shuanglin.li@mail.iap.ac.cn, Huang, Sijing1,3 (AUTHOR), Zhang, Chao4 (AUTHOR)
Source: Climate Dynamics. Jul2026, Vol. 64 Issue 7, p1-17. 17p.
Subjects: Atmospheric circulation, General circulation model, Antarctic ice, Seasons, Antarctic oscillation, Thermal gradient measurment
Geographic Terms: Weddell Sea (Antarctica), Ross Sea (Antarctica), Antarctica, Amundsen Sea (Antarctica)
Abstract: The Antarctic sea ice Dipole (ADP), the leading mode of sea ice variability in the Southern Ocean in austral spring and summer, has been found to be negatively correlated with the Southern Annular Mode (SAM), the leading mode of southern extratropical atmosphere variability. Whether the ADP affects SAM variability remains unclear, whereas the SAM has been widely shown to drive ADP-related sea ice anomalies. Based on sensitivity experiments using the Community Atmosphere Model version 5 (CAM5) and a dry Atmospheric General Circulation Model (AGCM) developed by Princeton University, this study investigates the feedback of ADP on the SAM and the underlying mechanisms. The results indicate that the negative-phase ADP—featured by decreased sea ice in the eastern Ross Sea to Amundsen Sea but enhanced sea ice in the Weddell Sea—triggers a negative SAM response, whereas the positive-phase ADP produces the opposite circulation and thermal anomalies. Mechanistically, the ADP drives a zonal "east-colder and west-warmer" thermal anomaly, which induces an atmospheric stationary wave anomaly, subsequently modulating transient eddy momentum and heat flux feedback and favoring the formation and maintenance of the negative SAM. This not only provides a dynamical framework for understanding the observed ADP-SAM connection, but also offers a benchmark for evaluating climate models simulated transient eddy feedback and zonal-asymmetric thermal gradients induced by sea-ice anomalies. [ABSTRACT FROM AUTHOR]
Copyright of Climate Dynamics is the property of Springer Nature 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
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DbLabel: Engineering Source
An: 194640755
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Simulated atmospheric seasonal responses of the southern annular mode to the Antarctic sea ice dipole in austral spring and summer.
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  Data: <searchLink fieldCode="AR" term="%22Cai%2C+Hui%22">Cai, Hui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Shuanglin%22">Li, Shuanglin</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> Shuanglin.li@mail.iap.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Huang%2C+Sijing%22">Huang, Sijing</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Chao%22">Zhang, Chao</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Climate+Dynamics%22">Climate Dynamics</searchLink>. Jul2026, Vol. 64 Issue 7, p1-17. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Weddell+Sea+%28Antarctica%29%22">Weddell Sea (Antarctica)</searchLink><br /><searchLink fieldCode="DE" term="%22Ross+Sea+%28Antarctica%29%22">Ross Sea (Antarctica)</searchLink><br /><searchLink fieldCode="DE" term="%22Antarctica%22">Antarctica</searchLink><br /><searchLink fieldCode="DE" term="%22Amundsen+Sea+%28Antarctica%29%22">Amundsen Sea (Antarctica)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Antarctic sea ice Dipole (ADP), the leading mode of sea ice variability in the Southern Ocean in austral spring and summer, has been found to be negatively correlated with the Southern Annular Mode (SAM), the leading mode of southern extratropical atmosphere variability. Whether the ADP affects SAM variability remains unclear, whereas the SAM has been widely shown to drive ADP-related sea ice anomalies. Based on sensitivity experiments using the Community Atmosphere Model version 5 (CAM5) and a dry Atmospheric General Circulation Model (AGCM) developed by Princeton University, this study investigates the feedback of ADP on the SAM and the underlying mechanisms. The results indicate that the negative-phase ADP—featured by decreased sea ice in the eastern Ross Sea to Amundsen Sea but enhanced sea ice in the Weddell Sea—triggers a negative SAM response, whereas the positive-phase ADP produces the opposite circulation and thermal anomalies. Mechanistically, the ADP drives a zonal "east-colder and west-warmer" thermal anomaly, which induces an atmospheric stationary wave anomaly, subsequently modulating transient eddy momentum and heat flux feedback and favoring the formation and maintenance of the negative SAM. This not only provides a dynamical framework for understanding the observed ADP-SAM connection, but also offers a benchmark for evaluating climate models simulated transient eddy feedback and zonal-asymmetric thermal gradients induced by sea-ice anomalies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Climate Dynamics is the property of Springer Nature 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.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s00382-026-08242-9
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 1
    Subjects:
      – SubjectFull: Atmospheric circulation
        Type: general
      – SubjectFull: General circulation model
        Type: general
      – SubjectFull: Antarctic ice
        Type: general
      – SubjectFull: Seasons
        Type: general
      – SubjectFull: Antarctic oscillation
        Type: general
      – SubjectFull: Thermal gradient measurment
        Type: general
      – SubjectFull: Weddell Sea (Antarctica)
        Type: general
      – SubjectFull: Ross Sea (Antarctica)
        Type: general
      – SubjectFull: Antarctica
        Type: general
      – SubjectFull: Amundsen Sea (Antarctica)
        Type: general
    Titles:
      – TitleFull: Simulated atmospheric seasonal responses of the southern annular mode to the Antarctic sea ice dipole in austral spring and summer.
        Type: main
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          Name:
            NameFull: Cai, Hui
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            NameFull: Li, Shuanglin
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            NameFull: Huang, Sijing
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            NameFull: Zhang, Chao
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          Dates:
            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 09307575
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            – Type: volume
              Value: 64
            – Type: issue
              Value: 7
          Titles:
            – TitleFull: Climate Dynamics
              Type: main
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