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A Long-Term Shift in Flow Regimes over the Antarctic Peninsula.

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Title: A Long-Term Shift in Flow Regimes over the Antarctic Peninsula.
Authors: Guarino, Maria-Vittoria1,2,3 (AUTHOR), Ridley, Jeff K.4 (AUTHOR), Colwell, Steve2 (AUTHOR), Farneti, Riccardo3 (AUTHOR), Giuliani, Graziano3 (AUTHOR), Hindley, Neil5 (AUTHOR), King, John2 (AUTHOR), Kucharski, Fred3 (AUTHOR), Polichtchouk, Inna6 (AUTHOR), Tompkins, Adrian Mark3 (AUTHOR), Vignon, Étienne7 (AUTHOR), Wright, Corwin5 (AUTHOR)
Source: Journal of Climate. Jan2026, Vol. 39 Issue 2, p749-767. 19p.
Subjects: Gravity waves, Thermal stability, General circulation model, Antarctic ice, Global warming, Ecological impact, Atmospheric circulation
Geographic Terms: Antarctic Peninsula (Antarctica), Antarctica
Abstract: Surface warming in the polar regions has important consequences for the stability of the lowest layers of the atmosphere and for atmospheric vertical movement. Here, using ERA5 reanalysis data and in situ measurements, we quantify the evolving static stability of the lowest 1 km of the Antarctic atmosphere and show that the Brunt–Väisälä frequency, a measure of atmospheric stability, has been steadily decreasing since the 1950s. Using satellite observations, reanalysis, and targeted climate simulations, we find that this reduced stability has prompted a shift in prevailing flow regimes over the Antarctic Peninsula by altering regional wind flow and enhancing the generation of orographic gravity waves. Increased gravity wave forcing from the Antarctic Peninsula can have important implications for global-scale circulation, polar vortex strength, ozone depletion, and midlatitude weather. Significance Statement: We present consequences of Antarctic surface warming for the stability of the lower atmosphere since the 1950s. We show that the surface atmosphere over the Antarctic Peninsula has become less stable, and that this reduced stability favors the generation of atmospheric gravity waves from the Peninsula, one of the major sources of atmospheric waves on the planet. We provide a physically based explanation (i.e., a shift in flow regimes) for the increased gravity wave forcing that we find in an unprecedented set of reanalysis products, satellite observations, and model simulations, and that we present here for the first time. Gravity wave forcing changes can have profound ramifications for the global climate, from polar vortex strength to ozone depletion and midlatitude weather. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Climate is the property of American Meteorological Society 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.)
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DbLabel: Engineering Source
An: 190802484
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: A Long-Term Shift in Flow Regimes over the Antarctic Peninsula.
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  Data: <searchLink fieldCode="AR" term="%22Guarino%2C+Maria-Vittoria%22">Guarino, Maria-Vittoria</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ridley%2C+Jeff+K%2E%22">Ridley, Jeff K.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Colwell%2C+Steve%22">Colwell, Steve</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Farneti%2C+Riccardo%22">Farneti, Riccardo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Giuliani%2C+Graziano%22">Giuliani, Graziano</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hindley%2C+Neil%22">Hindley, Neil</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22King%2C+John%22">King, John</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kucharski%2C+Fred%22">Kucharski, Fred</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Polichtchouk%2C+Inna%22">Polichtchouk, Inna</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tompkins%2C+Adrian+Mark%22">Tompkins, Adrian Mark</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vignon%2C+Étienne%22">Vignon, Étienne</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wright%2C+Corwin%22">Wright, Corwin</searchLink><relatesTo>5</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="DE" term="%22Gravity+waves%22">Gravity waves</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22General+circulation+model%22">General circulation model</searchLink><br /><searchLink fieldCode="DE" term="%22Antarctic+ice%22">Antarctic ice</searchLink><br /><searchLink fieldCode="DE" term="%22Global+warming%22">Global warming</searchLink><br /><searchLink fieldCode="DE" term="%22Ecological+impact%22">Ecological impact</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+circulation%22">Atmospheric circulation</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Antarctic+Peninsula+%28Antarctica%29%22">Antarctic Peninsula (Antarctica)</searchLink><br /><searchLink fieldCode="DE" term="%22Antarctica%22">Antarctica</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Surface warming in the polar regions has important consequences for the stability of the lowest layers of the atmosphere and for atmospheric vertical movement. Here, using ERA5 reanalysis data and in situ measurements, we quantify the evolving static stability of the lowest 1 km of the Antarctic atmosphere and show that the Brunt–Väisälä frequency, a measure of atmospheric stability, has been steadily decreasing since the 1950s. Using satellite observations, reanalysis, and targeted climate simulations, we find that this reduced stability has prompted a shift in prevailing flow regimes over the Antarctic Peninsula by altering regional wind flow and enhancing the generation of orographic gravity waves. Increased gravity wave forcing from the Antarctic Peninsula can have important implications for global-scale circulation, polar vortex strength, ozone depletion, and midlatitude weather. Significance Statement: We present consequences of Antarctic surface warming for the stability of the lower atmosphere since the 1950s. We show that the surface atmosphere over the Antarctic Peninsula has become less stable, and that this reduced stability favors the generation of atmospheric gravity waves from the Peninsula, one of the major sources of atmospheric waves on the planet. We provide a physically based explanation (i.e., a shift in flow regimes) for the increased gravity wave forcing that we find in an unprecedented set of reanalysis products, satellite observations, and model simulations, and that we present here for the first time. Gravity wave forcing changes can have profound ramifications for the global climate, from polar vortex strength to ozone depletion and midlatitude weather. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Climate is the property of American Meteorological Society 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=190802484
RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1175/JCLI-D-25-0330.1
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 749
    Subjects:
      – SubjectFull: Gravity waves
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: General circulation model
        Type: general
      – SubjectFull: Antarctic ice
        Type: general
      – SubjectFull: Global warming
        Type: general
      – SubjectFull: Ecological impact
        Type: general
      – SubjectFull: Atmospheric circulation
        Type: general
      – SubjectFull: Antarctic Peninsula (Antarctica)
        Type: general
      – SubjectFull: Antarctica
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      – TitleFull: A Long-Term Shift in Flow Regimes over the Antarctic Peninsula.
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              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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